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					                     DCS User Requirements Document
                       for PHOS and CPV Detectors
                                 Version 0.0 (14 September 2002)

       1. INTRODUCTION
        PHOS is an electromagnetic calorimeter of high granularity consisting of 17920 PWO
crystals, coupled to APD with low-noise preamplifiers and frozen at –24oC. It will be positioned
on the bottom of the ALICE set-up and will cover a unit in pseudo rapidity and hundred degrees in
azimuth angle. The PHOS is optimized for measuring thermal photons in the range ~0.5-10 GeV/c
as well as for direct photons up to 100 GeV/c.
        The Charged-Particle Veto (CPV) detector is based on the MWPC with pad readout. Its
aims are an efficient detection of charged particles at the front of PHOS and measurement of their
coordinates.

       2. PHOS AND CPV DESCRIPTION
      In the final ALICE experimental set-up five PHOS modules and five CPV detectors (one
CPV over each PHOS module) will be installed. An axonometric view of the PHOS and CPV
modules installed at the PHOS cradle are shown in Fig. 1.




                                              Fig.1




       2.1. PHOS module
       Cross-sections of PHOS and CPV modules are shown in Fig 2. Crystals are placed in the
cooling volume of PHOS module. Crystal size is 22x22x180 mm3. The APD are glued to the
bottom of crystals. The APD preamps are also situated in the cooling volume. The PHOS FEE is
placed in the warm part, i.e. in the bottom of the module. The CPV is placed at the top of the
PHOS, outside of the cooling volume. For normal operation APD need individually tuned HV bias
in the range 300-400 V.




                                             Fig. 2

       Power supplies of the PHOS
The demands to the HV PHOS power supplies for the BIAS APD:
   - Digital regulation of the BIAS voltage in range 300-400 V;
   - Step of voltage changing is equal to 0.5 V for M=100 and –25C that gives 2% of accuracy
      of matching the APD gains. For the BIAS setting it will be used 8 bits DAC;
   - Pulsations and noises of voltage must be <25 mV in order that M will be 0.1% instability.

PHOS APD Preamplifier Power Supply requirements:
  - dynamic range = 1mV – 8 V;
  - power = 12 V, -6 V;
  - power dissipation = 110mW;
  - total power dissipation per PHOS module = 395 W.

PHOS FEE Power Supply requirements:
  - power supply must generate: 1.5 V and 3.3 V to FPGA.
                                +5 V to MAX115 and ADS830 ICs
                                -5 V to MAX115 ICs.
  - power dissipation per one module is about 1 kW.




                                                                                                 2
   Cooling system of the PHOS
The aim of the PHOS cooling system is as follows:
• Cooling of the crystals massif to the temperature of -25°С within the limits
  of ±0,2°С.
• Removing the heat from FEE and PCB electronics.
• Removing the heat penetrating through an outside thermal isolation.
• Removing the heat from the cooling machine into an environment.


       2.2. CPV Module
       The MWPC of CPV is a conventional 15 mm gap (within  50m) 145x130x1.5 cm3
gaseous detector with anode wires 30 m in diameter and a pitch of 5.6 mm. The pad size is
22x11 mm2, and the cathode-to-anode gap of 7.5 mm. The pad panels, made of light and stiff
composite materials, hold on one face the pad PCB and on the other the front-end electronics
(FEE). The connections between the pads and FEE inputs are ensured by 50 pins ERNI connectors.
The anode 2.2 kV has to be provided via a high voltage system remotely controlled with a single
channel current sensitivity less then 2 nA.

       FE & RO Electronics of the CPV
        Two dedicated ASIC chips have been developed in the framework of the HMPID project. In
the HMPID application the GASSIPLEX analogue output will be presented to the input of a
commercial 12-bit ADC (AD9220ARS) followed by the DILOGIC chip. Data are then readout via
the standard ALICE optical link (DDL) [13]. The same electronics will be also used for pad readout
in the CPV modules.
        The GASSIPLEX-0.7 [11] chip is a 16-channel analog multiplexed low noise signal
processor working in TRACK&HOLD mode. It features a dedicated filter to compensate for the
long ion drift tail, a shaper and internal protection against discharges. Up to 60 chips can be run in
daisy-chain mode, greatly reducing the number of the needed ADCs.
        The DILOGIC chip [12], designed in the ALCATEL-MIETEC 0.7 technology, is a sparse
data scan readout processor providing zero suppression and pedestal subtraction with individual
threshold and pedestal values for up to 64 channels. Several chips can be daisy-chained on the same
18-bit (12-bit pulse height + 6-bit address) output bus. The power consumption is 60mW for a
read/write speed of 20 MHz. Asynchronous read/write operations are allowed.
        The implementation of the modular arrays to read out the CPV modules is organized as in
the HMPID detector according to a parallel/serial architecture. The module is first subdivided into
11 columns of seven cards housing three GASSIPLEX each for a total of 452 pad channels. Each
column is connected to a proper buffer memory (Column Memory and Read/Write protocol card:
CMRW), finally read-out via DDL sender card.
        In the Tab. 1 are reported the relevant power supply parameters respectively for the
GASSIPLEX, DILOGIC2, ADC and memory buffer chips. For remote control and monitoring
purposes, as can be seen from table 1, the current drained from one FEE raw or RO card has to be
measured with mA of sensitivity if a single chip failure has to be detected. This suggest to verify if
the measured parameter are in the selected P.S. units is based at least on 8 bit ADC’s. In this way
the sensitivity is also sufficient for voltage parameter measurements.




                                                                                                    3
    CPV Power Supplies              Voltage Current      Power      Noise     Type
                                                                    ripple

GASSIPLEX Power Supply                                             < 20 mV, Switching
requirements                                                          pp
                          1 Chip     +2.8 V    27 mA     75.6
                                                         mW
                                     -2.8 V    28 mA     78.4
                                                         mW
              1 Column (21 Chips)    +2.8 V    0.57 A 1.60 W
                                     -2.8 V    0.59 A 1.65 W
            1 Module (462 Chips)     +2.8 V   12.54 A     35.20
                                                             W
                                     -2.8 V   12.98 A     36.30
                                                             W

DILOGIC Power Supply                                               < 30 mV, Switching
requirements                                                          pp
              1 DILOGIC Chip          +5 V     20 mA        100
                                                            mW
     1 Column (4 DILOGIC chips)       +5 V        80mA    0.4 W
    1 Module (88 DILOGIC chips)       +5 V     1.76 A     8.8 W

ADC Power Supply requirements                                      < 5 mV,    Linear
                                                                      pp
                    1 ADC Chip        +5 V     17 mA        85.0
                                                            mW
                                      +5 V     17 mA        85.0
                                                            mW
         1 Column (4 ADC chips)       +5 V     68 mA         340
                                                            mW
                                      +5 V    170 mA         340
                                                            mW
        1 Module (88 ADC chips)       +5 V     8.16 A    7.48 W
                                      +5 V     8.16 A    7.48 W

CMRW + TTL Power Supply                                            < 30 mV, Switching
requirements                                                          pp
                      1 Card          +5 V    550 mA 2.75 W
              1 Module (9 Cards)      +5 V     4.95 A     24.75
                                                             W
                                          Table




                                                                                        4
         The CPV GAS system
          It has been designed in close collaboration with C.Gregory (EST/LEA). The CPV gas
  system has to provide two type of gases: CO2 and Argon for the five MWPC’s and FEE enclosure
  box. If water vapour or Oxygen contamination is detected on the MWPC gas outlet then the gas
  inlet has to be switched on the pure Argon or. CO2. The requirement that all circuits has to be
  purged before the initial module connections are made. The gas control system, based on PLC, will
  be provided by the CERN. We will ask for some interlock lines and one of them will be used to kill
  the HV system if a dangerous gas chamber contamination or anomalous delta pressure between
  MWPC and FEE enclosure box is detected.

         List of requirements for the CPV gas system and FEE enclosure box.

Detector between ~ 30 and ~35m below bubbler in rack        Parameter / Value / Range
on PLUG.

Total chamber volume ( 5 CPV modules)                       142 l
FEE Enclosure box                                           394 l

CHAMBER

5 channels for chamber- operation/HV test / purge / leak test CO2 / Ar
Purity of gas supply                                          < 5 ppm O2
                                                              < 5 ppm H2O

Flow per channel – operation Argon                          60 l/h

Flow per channel – operation CO2                            20 l/h

Operational pressure –at chamber                            +3 mbar
Pressure regulation                                         +/- 0.3 mbar

Single chamber Pressure Monitoring                          -10 to +20 mbar
Note: measured on or near CPV module in 0.5T field

Module pressure must always be greater than enclosure       Pdiff > 0.5 mbar
Pressure – with or without flow .

Operational Pressure difference (chamber – enclosure)       Pdiff = 1.0 mbar
                                                            (adjustable 0 - 3 mbar)
Analysis of input gas                                       O2 ppm (range 0-10)
(CO2 compatible monitor cells)                              H2O ppm (range 0-100)

Analysis output gas                                         O2 ppm (range 0-10)
                                                            H2O ppm (range 0-100)



                                                                                                  5
Enclosure pressure measurement                               -10 to + 20 mbar
(on module inside magnet @ 0.5 Tesla)

10 channels for electronics enclosure                        Ar or CO2

Flow per channel                                             ~400 l/h
Pressure in channel = 1 mbar below chamber pressure           +/- 0.3 mbar
                                                             (adjustable in range 0 – 3 mbar)




          The CPV Cooling system

         The CPV modules will operate with a tight FEE enclosure boxes. The heat dissipation of the
  CPV FEE is ~ 0.17 kW/module. The box can be cooled to ensure stable and well controlled
  detector temperatures during operation, The box will also provide additional shielding for the FEE.
  The cooling circuits will be mounted on the outside of the enclosure box. These circuits will be
  connected with the cooling circuits of the PHOS. Its temperature control system will be based on
  PLC. We will ask for some interlock lines and one of them will be used to kill the LV system of a
  CPV module for FEE and RO electronics if an over temperature on the enclosure box is detected.

                                          CPV cooling data

        Total heat dissipation                               0.85                  KW
          Heat removed by coolant                            0.65                  KW
          Heat dissipated into surrounding air                0.20                 KW
        Number of circuits (modules)                            5
        Heat dissipation per circuit                          0.17                 KW
                                                                                   o
        Operating temperature                             18 < & < 25               C
        Cooling fluid                              The same as for PHOS




                                                                                                   6
         3. The Control System of PHOS spectrometer.
       On the Fig. 3 a schematic drawing of the PHOS Control System (CS) is presented.
 According to the detector structure the PHOS CS consists of ten subsystems: CS of five PHOS
 modules and CS of five CPV modules.

         The control system of PHOS module has been divided into four subsystems:

    1.      High Voltage (HV) of the APD bias,
    2.      Low Voltage (LV) of the PHOS FEE,
    3.      Temperature monitoring of the PHOS FEE
    4.      Cooling of the crystals volume, PHOS and CPV FEE,

         The control system of CPV module has also been divided into four subsystems:

    1.      High Voltage (HV) of the CPV MWPC,
    2.      Low Voltage (LV) of the CPV FEE,
    3.      Temperature monitoring of the FEE,
    4.      Gas mixture of the CPV MWPC.



                                     PHOS


          5 PHOS Modules                                     5 CPV Modules


HV        LV          FEE         Cooling,         HV           LV          FEE         GAS
APD       FEE        T-mon        warming         MWPC          FEE        T-mon        Mix.


                                                 Crystals Volume, FEE

                                                 N2 purging

                                                 CPV FFE

                                             Fig. 3




                                                                                               7
       3.1. Cooling and Temperature Stabilization of the PHOS.

       The cooling and temperature stabilization system of the PHOS includes two cooling
machines and five temperature monitoring system, i.e. one per PHOS module, see Fig.4.
Temperature regulation is provided by means of switching the compressor of cooling machine. The
module temperature monitoring system includes 40 standard temperature sensors per one module:
Pt100 sensors in the warm volume and special Ni100 sensors with current stabilizer scheme in the
matrix of crystals.
                                        Detector Control System of the PHOS

                              Cooling system                                            Ni100 x 36               Module #1

                   Cooling machine
                                                              Current                       ...
                  Pt100 x 2                                  Stabilizer
                                                           200 mkA X 36                       Warm volume
                                                                               Pt100 x 2
                                     Control
                                                                                                                    DAQ PHOS
 Ethernet
            MCU       AI       DI       DO


                                                Ethernet     MCU          AI                 AI      AI     AO
                                                                          1
                                                                                  ...        6       7       1
                                                                                                                         Test

                     Test



                                                                                                                        to next module
                                 RS-485

                                                               8000 Series - Compact Network Data Acquisition & Control System
                                                               MCU - Main Control Unit (processor, Ethernet, RS-232, RS-485)
                 Monitor of                     Ethernet       AI    - 8-Channel Analog Input Module
        cooling & thermostabilisation                          AO - 4-Channel Analog Output Module
                   systems                                     DI    - 16-Channel Digital Input Module
                                                               DO - 16-Channel Digital Output Module




                                               Fig. 4


       Cooling system of the PHOS will monitor the following parameters:
       1. Level of cooling liquid (for each cooling machine).
       2. Temperature of cooling liquid (2 point for each cooling machine).
       3. Temperature of matrix (36 point for each module).
       4. Temperature in warm volume (2 point for each module).

        Interlock lines from the cooling system should be provided to prevent dangerous operation
conditions.



                                                                                                                                 8
     2. Base parameters for the PHOS cooling system
Parameter                                                                 Volume                Units

Heat removed from internal sources in the detector                              10                kW

Heat coming from environment through the thermal isolation                      2,5               kW
(piping are included) into the detector 2,5
Overall heat removed from the detector                                          12,5              kW

Heat dissipated into the ear from the cooling system                            1,0               kW
Compressor
Electrical power used by cooling system                                         20                kW


Parameter                  First circuit               Second circuit             Third circuit

Cooling fluid (Coolant)    Freon R404A                 Hydrofluoroether           Demineralized
                           (SUVA®HP62)                 HFE-7100                   water of the
                                                                                  CERN network
Operating pressure, bar              16                           2                           -
Design pressure, bar                 18                           3                           -
Test pressure, bar                   24                           5                           -
Coolant flow rate, L/min              -                          90                 52(3.12 m3/hour)
Total quantity, kg                   40                         160                           -
Total piping length, m                -                          50                           -
Piping diameter, mm                   -                          40                      32 (11/4”)
Entrance coolant                      -                -26+3(into the cooling                14
temperature, oC                                              machine)
Exit coolant                          -                   -30+3(from the                   23
temperature, oC                                          cooling machine)
Temperature on outside     70 on the compressor                14-20                        -
surface, oC                       surface;
                           <20 on the rest surface




                                                                                                        9
   I. DESCRIPTION AND REQUIREMENTS OF THE                  CONTROL SUB-SYSTEMS OF            CPV

    The CPV Control System is quite similar to that of the HMPID. We have used therefore many
solutions found already for the HMPID CS in the CPV Control System also. The basic components
of the CPV Control System are as follows:

          Low Voltage : provide the Power supply for the FE & RO electronics. It consist of a
           series of WIENER PL600 Power Supply units that control, by its modules, the segments
           of the detector.
          High Voltage : provide the Power supply for the Anodic wires for the CPV. It consist of
           a CAEN SY1527 crate that hosts some CAEN A1821P HV cards, which channels food
           the HV segments.
          Gas : provide the circulation of the gas into the detector modules. It monitor and control
           by means of a PLC the gas distribution….
          Cooling : control and monitor of temperature and pressure of modules it consist of a
           PLC connected to sensors and actuator …..
          Rack : control and monitor the control racks. It consist some remote controlled Racks
           that interface with the SCADA System.


   1) THE HIGH VOLTAGE POWER SUPPLY FOR CPV MODULE

       a) Functionality
        The HV system is supposed to fed with different channels both anode wires at 2.2 kV.
        The 256 anode wires are divided in 16 groups of 16 wires each. This wire grouping allows
for a perfect geometrical correspondence between 16 wires and one of the 22 FEE raw mandatory
to safety switch on-off the corresponding HV-LV channels according a safety procedure. The basic
HV-LV segment to be switched ON/OFF if a FEE or HV channel failure occurs, according to a
safety procedure.
            The HV system will be based on the CAEN SY1527 and 12ch A1821 board with a
range from 0 up 3kV and a 2nA of current resolution. For each segment the DCS must be able to
switch ON/OFF, set the voltage, set the maximum current, monitor the voltage and the current
supplied.
        b) Device or Equipment
        Each voltage source for a segment is produced by one of the 16 output channels of a CAEN
A1821P module; The modules are hosted into a CAEN SY1527 Power supply crates, that is able to
contain up to 16 modules. The crate control each channel monitoring and operation as Switch
ON/OFF, trip control, ramping etc., and communicate with the SCADA system by an Ethernet-
TCP/IP-DCOM/OPC connection.
        For the entire CPV module are necessary 16 HV channels, 1 A1821P CAEN boards and 1
SY1527 CAEN crate.
            Location:
            The power supply will be located into the cavern.

           Documentation:
           …..


                                                                                                  10
c) Parameters
    Segment Voltage Set value
   Define the value of Voltage setting to a HV Power supply channel, setting by the CAEN
   SY1527 crate.

    Parameter type                   AO
    Parameter name                   V0set
    Physical output range            0 – 3kVolt
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     1 Volt
    Corresp. Control signal resol.
    Time resolution


    Segment Current Set value
   Define the value of Current setting to a HV Power supply channel, setting by the CAEN
   SY1527 crate.

    Parameter type                   AO
    Parameter name                   I0set
    Physical output range            0 – 1 uA
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     2 nA
    Corresp. Control signal resol.
    Time resolution


    Segment Voltage Rump Up Set value
   Define the value of Volt/sec setting to a HV channel rump up phase, setting by the
   CAEN SY1527 crate.

    Parameter type                   AO
    Parameter name                   Rup
    Physical output range            0 – .. Volt/sec
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     1 Volt
    Corresp. Control signal resol.
    Time resolution




                                                                                        11
 Segment Voltage Rump Down Set value
Define the value of Volt/sec setting to a HV channel rump down phase, setting by the
CAEN SY1527 crate.

 Parameter type                   AO
 Parameter name                   RDwn
 Physical output range            0 – .. Volt/sec
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     1 Volt
 Corresp. control signal resol.
 Time resolution


 Segment Trip time Set value
Define the value of seconds setting to a HV channel trip time, setting by the CAEN
SY1527 crate.

 Parameter type                   AO
 Parameter name                   Trip
 Physical output range            0 – .. sec ???
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     ??? sec
 Corresp. control signal resol.
 Time resolution


 Segment Max Software Voltage Set value
Define the value of maximum Voltage setting to a HV channel by the software V0set
change, setting by the CAEN SY1527 crate.

 Parameter type                   AO
 Parameter name                   SVMax
 Physical output range            0 – 3 kVolt
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     1 Volt
 Corresp. control signal resol.
 Time resolution




                                                                                       12
 Segment Voltage Monitor value
Define the value of Voltage supplied by a HV Power supply channel, read from the
CAEN SY1527 crate.

 Parameter type                   AI
 Parameter name                   Vmon
 Physical input range             0 – 3kVolt
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     1 Volt
 Corresp. control signal resol.
 Time resolution


 Segment Current Monitor value
Define the value of Current supplied by a HV Power supply channel, read from the
CAEN SY1527 crate.
 Parameter type                    AI
 Parameter name                    Imon
 Physical input range              0 – 10 uA ???
 Control signal range              OPC/DCOM REAL variable
 Required physical resolution 2 nA
 Corresp. control signal resol.
 Time resolution


 Segment ON/OFF Status
Monitor the actual status of a HV Power supply channel, read from CAEN SY1527
crate.
 Parameter type                    DI
 Parameter name                    Pw
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)               Segment switched OFF
 Logical 1 (meaning)               Segment switched ON
 Time resolution
                                   * OPC/DCOM BOOL variable




                                                                                   13
 Segment Status
Monitor the actual status of a HV Power supply channel, read from CAEN SY1527
crate.
 Parameter type                    AI
 Parameter name                    Status
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)
 Time resolution
                                   * OPC/DCOM INTEGER variable

 Segment ON/OFF Command
Control the switch ON/OFF of a HV Power supply channel, write to CAEN SY1527
crate.
 Parameter type                 DO
 Parameter name                 Pw
 Physical output signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)            Segment switched OFF
 Logical 1 (meaning)            Segment switched ON
 Impedance
                                * OPC/DCOM BOOL variable

 Board Status
Monitor the actual status of a HV Power supply board, read from CAEN SY1527 crate.
 Parameter type                    AI
 Parameter name                    BdStatus
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)
 Time resolution
                                   * OPC/DCOM INTEGER variable




                                                                                14
 Board Temperature Monitor value
Monitor the value of Temperature of a HV Power supply board, read from the CAEN
SY1527 crate.
 Parameter type                  AI
 Parameter name                  Temp
 Physical input range            0 – 80°C ???
 Control signal range            OPC/DCOM REAL variable
 Required physical resolution 0.1 °C
 Corresp. Control signal resol.
 Time resolution


 Crate Kill Command
Control the Killing of a HV Power crate, write to CAEN SY1527 crate.
 Parameter type                   DO
 Parameter name                   Kill
 Physical output signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)              Crate Kill
 Impedance
                                  * OPC/DCOM BOOL variable

 Crate Clear Alarm Command
Control the Clear Alarm signal of a HV Power crate, write to CAEN SY1527 crate.
 Parameter type                    DO
 Parameter name                    ClearAlarm
 Physical output signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)               Crate Clear Alarm
 Impedance
                                   * OPC/DCOM BOOL variable




                                                                                  15
 GEN signal configuration
Monitor the general signal configuration status of a HV Power supply crate, read from
CAEN SY1527 crate.
 Parameter type                    AI
 Parameter name                    GenSignCfg
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)
 Time resolution
                                   * OPC/DCOM INTEGER variable

 System Input Status
Monitor the actual status of a HV Power supply Input panel, read from CAEN SY1527
crate.
 Parameter type                    AI
 Parameter name                    FrontPanIn
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)
 Time resolution
                                   * OPC/DCOM INTEGER variable

 Power Supply modules Status
Monitor the actual status of the HV Power supply modules hosted into the PS crate, read
from CAEN SY1527 crate.
 Parameter type                    AI
 Parameter name                    HvPvSM
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)
 Logical 1 (meaning)
 Time resolution
                                   * OPC/DCOM STRING variable




                                                                                    16
            Fan Status
           Monitor the actual status of the Fans of the crate, read from CAEN SY1527 crate.
            Parameter type                     AI
            Parameter name                     FanStat
            Physical input signal
            Logical 0 (signal definition)
            Logical 1 (signal definition)
            Logical 0 (meaning)
            Logical 1 (meaning)
            Time resolution
                                               * OPC/DCOM STRING variable

           Parameter table for the CPV detector

           Parameter             AI           AO          DI          DO

           V0set                              16
           I0set                              16
           Rup                                16
           RDwn                               16
           Trip                               16
           SVMax                              16
           Vmon                  16
           Imon                  16
           Pw                                                         16
           Pw                                             16
           Status                16
           BdStatus              1
           Temp                  1
           Kill                                                       1
           ClearAlarm                                                 1
           GenSigCfg             1
           FrontPanIn            1
           HvPwSM                1                                                String
           FanStat               1                                                String
           …


       d) Interlocks and Safety aspects
       Here goes a description of the interlocks that can be received or generated. Describe their
nature (hardwired, software). Describe also interaction with other sub-systems or equipment
outside of My-Detectors responsibility.




                                                                                               17
       e)   Operational and Supervisory aspects
       Here goes a description of all aspects related to operation of the sub-system, its behavior,
constraints, etc. It should also describe the errors and alarms that can be generated in the sub-
system. A state diagram would be helpful (see below an example for a simple imaginary High
Voltage sub-system).

       2) THE LOW VOLTAGE POWER SUPPLY

       a) Functionality
        The LV Sub-system provide the Power Supply for the segments of the FE & RO
electronics. For each segment the DCS must be able to switch ON/OFF, set the voltage, set the
maximum current, monitor the voltage and the current supplied.

        b) Device or Equipment
        The LV power supply, will be based on the WINER PL500 F12 modular system. It consists
of a power box with 6 modules slots (12 outputs with dual modules), 3U 19” bin, with power factor
corrected mains input for >2500 W DC output at 230 V AC. All parameters are measured with 12
bit resolution. The power box can be equipped with a net card supporting the TCP/IP protocol. In
addition this system can be controlled by the SY1527 via a CANbus/HS CAENET interface card.
In this way, exploiting the SY1527 OPC server, the WIENER PS is seen as a SY1527 board and
can take profit also of the CAEN OPC server.
        Each module temperature is monitored and the V sensing per channel can be done via
sensing lines or calculated via wire resistor and measured current. Each dual module can provide
2….7 Volt/25 A max per channel. Sensing wire and output connector are located at the rear side of
the power bin
            Each voltage source for a segment is produced by a WINER PL600 module; the module
consist of one floating channel with a voltage range from 0.2 to 7 V / 25A for a maximum power
dissipation of 175W. The modules are hosted into a WINER PL600 crates, that is able to contain up
to 12 modules. The crates can be linked in ‘daisy chain’ with a Master Box that can operate via:
RS232 up 8 slave crates, CANbus up to 127 slave crates. In addition the Master Box support a
TCP/IP interface that offers network connection for remote control of the device.


            Location:
            The power supply will be located into the cavern.

            Documentation:
            …..




                                                                                                      18
c) Parameters

    Segment Voltage Set value
   Define the value of Voltage setting to a LV Power supply channel, setting by the
   WINER PL600 crate.

    Parameter type                   AO
    Parameter name                   Vset
    Physical output range            0 – 7Volt
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     0.1 Volt
    Corresp. Control signal resol.
    Time resolution


    Segment Current Set value
   Define the value of maximum Current setting to a LV Power supply channel, setting by
   the WINER PL600 crate.

    Parameter type                   AO
    Parameter name                   Iset
    Physical output range            0 – 25 Ampere
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     0.01 Ampere
    Corresp. Control signal resol.
    Time resolution


    Segment Voltage Monitor value
   Define the value of Voltage supplied by a LV Power supply channel, read from the
   WINER PL600 crate.

    Parameter type                   AI
    Parameter name                   Vmon
    Physical input range             0 – 7 Volt
    Control signal range             OPC/DCOM REAL variable
    Required physical resolution     0.1 Volt
    Corresp. Control signal resol.
    Time resolution




                                                                                      19
 Segment Current Monitor value
Define the value of Current supplied by a LV Power supply channel, read from the
WINER PL600 crate.

 Parameter type                   AI
 Parameter name                   Imon
 Physical input range             0 – 25 Ampere
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     0.01 Ampere
 Corresp. Control signal resol.
 Time resolution


 Segment ON/OFF Command
Control the switch ON/OFF of a LV Power supply channel, write to WINER PL600
crate.
 Parameter type                 DO
 Parameter name                 OnOff
 Physical output signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)            Segment switched OFF
 Logical 1 (meaning)            Segment switched ON
 Impedance
                                * OPC/DCOM BOOL variable

 Segment ON/OFF Status
Monitor the actual status of a LV Power supply channel, read from WINER PL600
crate.
 Parameter type                    DI
 Parameter name                    IsOn
 Physical input signal
 Logical 0 (signal definition)
 Logical 1 (signal definition)
 Logical 0 (meaning)               Segment switched OFF
 Logical 1 (meaning)               Segment switched ON
 Time resolution
                                   * OPC/DCOM BOOL variable




                                                                                   20
 Crate Temperature Monitor value
Monitor the temperature of a WINER PL600 crate.
 Parameter type                 AI
 Parameter name                 Temp
 Physical input range           0 – 60°C
 Control signal range           OPC/DCOM REAL variable
 Required physical resolution 0.1 °C
 Corresp. Control signal resol.
 Time resolution


 Crate Status value
Monitor the status of a WINER PL600 crate (OPC/DCOM INTEGER variable).

 Crate OverCurrent Error
Monitor the status of a WINER PL600 crate OverCurrent Error (OPC/DCOM BOOL
variable).

 Crate OverTemperature Error
Monitor the status of a WINER PL600 crate OverTemperature Error (OPC/DCOM
BOOL variable).

 Electronics Temperature Monitor value
Monitor the temperature of the FEE & RO electronics by a PLC control

 Parameter type                   AI
 Parameter name                   ElTemp
 Physical input range             0 – 100°C ?
 Control signal range             OPC/DCOM REAL variable
 Required physical resolution     0.1 °C
 Corresp. Control signal resol.
 Time resolution


Parameter table for one CPV Module
Parameter        AI          AO           DI           DO

Vset                         8
Iset                         8
Vmon            8
Imon            8
OnOff                                                  8
IsOn                                      8
ElTemp          5



                                                                             21
               Parameter table for the CPV detector

           Parameter              AI           AO           DI          DO

           Vset                                40
           Iset                                40
           Vmon                   40
           Imon                   40
           OnOff                                                        40
           IsOn                                             40
           Temp                   5
           CrateStatus            5
           CrateOverCurrent                                 5
           CrateOverTemperatu                               5
           re
           ElTemp                 25
           …


            Here goes a description of all parameters to be controlled, with the type of parameter,
ranges, precision, time resolution etc. If there is a group of parameters with all identical
characteristics and requirements one description can do, clearly indicating the number of identical
parameters (e.g. in the case of a set of identical HV channels). Also give any constraints that apply
to these parameters (e.g. maximum cable lengths between device and ADC).
            Refer to the appendix for help on filling this paragraph.

       d) Interlocks and Safety aspects
       Here goes a description of the interlocks that can be received or generated. Describe their
nature (hardwired, software). Describe also interaction with other sub-systems or equipment
outside of My-Detectors responsibility.

       e) Operational and Supervisory aspects

        Here goes a description of all aspects related to operation of the sub-system, its behavior,
constraints, etc. It should also describe the errors and alarms that can be generated in the sub-
system. A state diagram would be helpful (see below an example for a simple imaginary High
Voltage sub-system).
        Here should also go the requirements of the supervisory layer of the sub-system. This could
cover: a list of parameters to be archived (with archiving rate or deadband), ideas on user
interfaces, ideas on what events should be logged (commands, errors etc.).




                                                                                                  22
     II. REQUIREMENTS ON THE CONTROL SYSTEM
        The following aspects should be covered, related to the control system as a whole.
        a) Interlocks and Safety aspects
            Here goes a description of the interlocks that can be received or generated. Describe
their nature (hardwired, software). Describe also interaction with equipment outside of My-
Detectors responsibility.

         b) Operational and Supervisory aspects
         The integration of HV, LV and LC control systems has been accomplished in the PVSS II
     environment, the SCADA system selected after a market survey and careful tests carried out by
     the CERN IT/CO group.

       Here goes a description of all aspects related to operation of (the control system of) My-
Detector, its behavior, constraints, etc. It should also describe the errors and alarms that can be
generated in My-Detectors control system. A state diagram would be helpful.
       Here should also go the requirements of the supervisory layer of the control system as a
whole. This could cover: ideas on user interfaces, ideas on what events should be logged
(commands, errors etc.).

1.          TIMESCALES AND PLANNING
     Here goes the timescale of the project, including milestones (e.g. prototype tests, test beams
     etc.).

     1) Design
     Based on this URD a detailed solution should be projected for each sub-system and the
     prototyping can start. Once the prototype solution is working on the process and field level it
     will be linked up to PVSS and integrated into the supervisory layer environment. Indicate the
     latest date for these stages to be completed.
                               HV        LV        Coolin Gas       FEE
                               [mm/y [mm/y g               [mm/y [mm/y [mm/y [mm/y
                               y]        y]        [mm/y y]         y]        y]        y]
                                                   y]
      Process control
      solution projected
      Process control
      solution
      prototyped
      Process control
      linked to PVSS




                                                                                                       23
2) Production and Purchasing
The controls components (PLC’s I/O units, field buses and interfaces, etc) can only be
purchased in quantities once the devices to be controlled (HV and LV power supplies, cooling
and FE electronics equipment, etc.) have been fixed and a final prototype controls solution
exists. Please indicate for each sub-system the latest date at which the purchasing and test of
devices and controls components must be completed.
                          HV       LV        Coolin Gas          FEE
                          [mm/y [mm/y g                [mm/y [mm/y [mm/y [mm/y
                          y]       y]        [mm/y y]            y]        y]       y]
                                             y]
 P/P of devices to
 be controlled
 P/P of controls
 components
 P/P tests



3) Installation
Some detectors will be pre-assembled and tested on the surface before they are installed in the
pit. Indicate where this will take place (SXL2?). Give the pre-assembly and tests period and
indicate if and which controls sub-system should be available. Indicate as well the period of the
final installation of the detector in the pit. Preliminary dates for pre- and final installation as
they appear in the overall ALICE planning, are given below:
                          Pre-installation                      Final installation
  Project                 Start                  Finished             Start            Finish
  TPC                                 Dec-01          Oct-04       May-05             Nov-05
  HMPID                                Sep-03         Feb-05       May-05              Jul-05
  MUON                                 Sep-03          Jan-05       Apr-04             Jul-05
  ITS                                 Nov-03          Feb-05        Jun-05            Oct-05
  ZDC                                 Apr-04           Jul-04       Oct-04            Mar-05
  PMD                                 Apr-04          Sep-04        Sep-04            Mar-05
  PHOS/CPV                             Apr-??          Sep-??       Dec-??             Jun-??
  FMD/T0/V0                           Apr-04          Sep-04       Aug-05             Aug-05
  TOF                                May-04           Nov-04        Jan-05            Jun-05
  TRD                                May-04           Aug-04        Feb-05            Jun-05




                                                                                                 24
 Pre-assembly in:       HV        LV        Coolin    Gas       FEE
 SLX2                   [mm/y     [mm/y     g         [mm/y     [mm/y     [mm/y    [mm/y
                        y]        y]        [mm/y     y]        y]        y]       y]
                                            y]
 Pre-assembly and
 test - start
 Pre-assembly and
 test - end
 Is a control system
 needed (yes/no)?
 Final installation
 in the pit - start
 Final installation
 in the pit - end


4) Commissioning
Commissioning will normally start once the detectors are installed in the pit; individual sub-
systems first, then full detector and finally full experiment.
                          HV        LV         Coolin Gas      FEE
                          [mm/y [mm/y g                  [mm/y [mm/y [mm/y [mm/y
                          y]        y]         [mm/y y]        y]        y]         y]
                                               y]
 Individual sub-
 systems - start
 Individual sub-
 systems - end

                        start               end
                        [mm/yy]             [mm/yy]
 Full detector

 Full experiment                            31/12/2005



5) Operation with beam
For completeness, these are the LHC milestones.
 1st test with beam    01 / 02 / 2007
 Pilot run (1          01 / 04 / 2007
 month)
 PP physics run        01 / 08 / 2007
 Pb-ion physics run 01 / 03 / 2008




                                                                                                 25
6) Tests and Test beam
Please indicate if and when you plan to perform tests (with or without test-beam) and if you
wish to test prototype control solutions at this occasion. In this case please indicate which sub-
systems you wish to test.
                         start                end                  List of sub-system control
                         [mm/yy]              [mm/yy]              prototypes to test
 1st test period
 2nd test period
 3rd test period




                                                                                                 26

				
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