format Cern by alicejenny

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									                         Beam Diagnostics Overview

         Work ‘snapshot’ {this year}
         Aims
         General Context
                appreciation,where we fit
                     examples: DSP, WS
                Work, People, Priorities
                Glimpse of certain Worries
         Tour of Machines /Facilities
                AD
                CTF3
                ISOLDE
                Linacs
                PSB
                PS & Exp Areas
         New Orbit System for PS
         A.O.B.

PPC-14 Sept 01                          V Chohan     1
                 Beam Diagnostics current
                 of Activities (non-exhaustive)
       PSB Wire Scanners
       Normalizers for Closed Orbit M’ment in PS
       Isolde Instrumentation Integration
       PS new-CT studies Development with 500 MHz Digitizers
       OTR development/Tests
       Video Image Digitization / Linux PC/DSC etc (CTF3, OTR..
       CTF3 Prelim + Initial phase Developments + for startup 17/9/01
                    N.B. - new projects are essential for our staff
                           { D067-->AD --> CTF3 & LEIR }

       LHC DC-Beam Current Transformer
       AD M-shaped excitation for BTF based ramp tune m’ments
       East Hall
       LEIR work estimations/ projections /proposals
       CLIC study related activities ( R&D)
                    LaserWS, x-ray Position Sensitive Detection(Medical world..
PPC-14 Sept 01                               V Chohan                              2
                    Beam Diagnostics Overall Aims

       Maintain Essential Equipment for Current Operational Use
       Aim to React and Respond to URGENT Needs Fast
        including for Divisional Projects
                Recent Examples:: ( non-exhaustive)
                      Digitization for TOF Video screens images , in TT2 ……
                      OTR Development + for PS/SPS High Energy Coupling Checks
                      100K Turns in PS Measurement System for X - X’ Studies
       Launch rationalisation Activities in light of given
        manpower scenarios and constraints and aiming to go
        forward….examples ::
                PS Closed orbit vs trajectory CODD,
                review process launched ~July 2001…..




PPC-14 Sept 01                           V Chohan                                 3
                     Beam Diagnostics - an appreciation
                     and flavour of important issues:

       WHAT DO DIAGNOSTICS SYSTEMS INVOLVE &
        HOW THEY FIT IN THE ENVIRONMENT ?
                In our complex of Accelerators, since late 80’s , systems are NOMORE
                 pieces of hardware only - software issues and integration to higher
                 complex levels have become part & parcel of a given measurement
                 system


                The 1991 ‘model’ of Systems development and commissioning -
                 System Specific software, Infrastructure/Architecture , Application Level


       One must appreciate complexity of certain measurement
        systems as well as (a) general integration issues , (b) dependency
        on non-BD factors,         (c) shutdowns, (d) history ….
                Just two Examples
                       DSP Usage & development cycle: AAC, PS, PSB , AD…(LEIR?)
                       Wire Scanner etc..



PPC-14 Sept 01                                 V Chohan                                      4
                 Controls Architecture, where we
                  fit our Diagnostics Systems &
                         Who does what…..




PPC-14 Sept 01             V Chohan                5
                   Example of DSP System Development &
                 Environment - also applies to other complex
                       systems like PSB WireScanner




                                                            ADC 6441        DRX 6510

                                                                OUTPUT      OUTPUT

                                                                            3           7
                                                            2               +           +
                                                                            4           8
                                                            1               1           5
                                                                            +           +
                                                                            2           6
                                                                     IN 2
                                                                                        CH
                                                                    EXT                  D
                                                                    CLK
                                                                                        CH
                                                                     IN 1                C
                                                                OUTPUT          INPUT

                                                            2                           CH
                                                                                         B

                                                            1                           CH
                                                                                         A




                                                                                             POD          W 95

                                                                                                   JTAG

                                         SIGNAL GENERATOR




PPC-14 Sept 01                V Chohan                                                                           6
                 DSP Modules in VME - PS Div
                        Experience
        1989    THEMIS Board          under OS9       AAC Perf.check(AR Grp)
        1989    DataGeneral VASP with C25           PS Tunes(Baconnier Grp)
        1990    CO PS-SL LYNX-OS & UNWORKABILITY with THEMIS
        1991    ( BD Group Formation - regrouping of staff - ACH, Johnston
                 etc) AAC M’ment importance diminishes - Collider end &
                 LEAR too foreseen )
        1991    DATAGeneral VASP with C25              PSB Tunes(BD Grp)
        1992    DataGeneral goes bankrupt / bust
        1993     PS Tunes WORK with VASP Board BUT, decide to abandon
                 VASP & buy DataBeta DBV96 with Motorola DSPfor PSB Tunes
                  End-1993 ::{‘Big Bang’ tests with VASP on PSB }
        1997    Success with 1 Ring Tests in PSB with DBV96 ( 1 m’ment
                 every 15ms ) before new RF
        1999    All 4 PSB Rings MLPX m’ments every 5 ms with 500V pulser
        1999    PENTEK DRX Board          AD Tunes, Intensity, beam sizes(BD Grp)




PPC-14 Sept 01                    V Chohan                                           7
                   People, Work, Priorities vs. Projects:
                   { LEIR for CERN commitment to LHC, CTF3-
                   Further Stages , etc }

       Positive point is that for some systems we have new
        young people who lack experience but have the capacity
        to develop knowledge of OLD SYSTEM & build NEW
        systems BUT the INTEGRATION ASPECTS WOULD BE AN
        ISSUE OF IMPORTANCE

       EXPERIENCED staff departures in recent years and next:
        DWilliams, MLeGras ,JOlsfors, CCarter, OMarqversen,
        GMartini, LMerard ,..
                Making the aspects of maintenance & /or
                 system extension/improvements very difficult

       HENCE,often for many systems one can only propose
        “extension” or ‘copies’ of existing similar systems & the
        associated methodology of access even though the
        physical sensors & devices may have substantially new
        hardware component in them.


PPC-14 Sept 01                      V Chohan                        8
                 People, Work, Priorities vs. Projects:
                 { LEIR for CERN commitment to LHC, CTF3-
                 Further Stages , etc }


                                          becomes very Important :


 PRIORITY IN TERMS OF NEED & FINANCIAL PROVISION: new
        DEVICES - Example : PU’s ( AND CORRECTORS ? ) costs vs
        BENEFIT



 PRIORITY IN TERMS OF MANPOWER USAGE with clear
     understanding that importance of one would delay
     another




PPC-14 Sept 01                    V Chohan                           9
                         Diagnostics Systems - a GLIMPSE on
                     what next on important issues:
                     { opening a Pandora’s Box or A can of worms ? }

       Controls + VME Hardware getting old/ Companies go
        bankrupt, disappear, meaning ---->
                        Do we have Spares ? If not what do we do ?
                        New similar hardware(if stay in VME), market study, purchase,
                         development cycle ( Drivers, installation, tests, shutdowns…..
                         ….At least 2 yrs cycle from date of purchase ) .
                            Examples:
                               » DL515DL7515 [ BT & BTP Pickups, CTF3 Inj etc]
                               » STR751/755 [ L3 + L3 to PSB trafos, L2/L3 Measur.Line & PS Inj
                                 studies Semgrids MSH , BLVDs ]
                               » ELTEC video DGTZ

       PCI systems & Integration (Image DGTZ, 500MHz Acqiris )
       Standardization or freezing vs. progress
                 Example :Tune Measurement systems, Method used and DSP: AD to
                 LEIR to PS & PSB..?
       Change the 1991 Model to Vertical Slice ? How ? manpower
       Keeping in-house knowledge & outsource ? Feasibility?
                { H/W - S/W - Timing & intimate interaction }
PPC-14 Sept 01                                  V Chohan                                          10
                     Beam Diagnostics - Some Current
                     Topics…per machine or facility
       Linac2:
                Consolidation of Measurement lines Systems          continued……..
       Linac3:
                Multi-slit Emittance M’ment - Important for non-Pb Species(LHC)
                 Revival of Massimo Crescenti ‘s program?? ( issues of H/W, S/W,
                 Applic., very old Frame Grabber, responsibility?…… PRIORITY SETTING

                Faraday Cup Electron Suppression ( ex-E.Tanke’s work? ..
                 Responsibility ? C.Hill ? - one should be doing good housekeeping
                 by standardizing with Isolde ‘experience’ if that’s the case , BD takes
                 on more work !!               Organizational Issue /needs discussion
       AD:
                M-shaped beam excitation in BTF technique to measure Tunes on ramps
                 [ URGENT PRIORITY FOR LEIR IMPLICATIONS]
                new high sensitivity ( E7 pbars) trafo in extr lin , calibr., timing, etc
       ISOLDE:
                Needle Wire Scanners, SemGrids, Faraday Cups …. WORK continues


PPC-14 Sept 01                                V Chohan                                       11
                     Beam Diagnostics - Some Current
                     Topics…per machine or facility
       CTF3: Preliminary phase shutdown work this year & preparations
        Priority for 17Sept01 startup { Major renewal / modification/ relocation/
                                                    reorganization exercise }
                Pickups UMA
                       Bessel Filters, amplifiers,RT-task, Timing issues…. ( in absence of MLGras ….
                ECM’s & WCM’s & TRA [ Current Monitors & transformer]
                       Timing issues..
                Wire Beam Scanners
                Sem-grids
                MTV’s
                Slits SLH/SLV’s
                Transition Cerenkov monitors (TCMs) and Synch. Radiation light ports (MSRs)
                Optical Lines Mods to Streak Camera from TCM’s MSR’s
                Special pickups ( tune M’ment in EPA ).
       CTF3 : ‘Further Phases’ work :
                PU Design, 10 GHz WCM’s ...
                Thermal dissipation in OTR Study….
                Etc..
PPC-14 Sept 01                                  V Chohan                                                12
                    Beam Diagnostics - Some Current
                    Topics…per machine or facility
       PSB:
                Wire Scanners

                Half-Turn Pickup
                       ORGANIZATIONAL ISSUE / Jose Sanchez- Gate Module, r f cage + NIM
                        cleanup etc.. Comblin, REQUEST coordination..


                Beam Transfer Function M’ment: ORGANIZATIONAL ISSUE


                BTU30 repair and auto gain setting.. Machine Access needed

                Image DGTZ for Inj & Ej screens: Feasible -




PPC-14 Sept 01                               V Chohan                                      13
                    Beam Diagnostics - Some Current
                    Topics…per machine or facility
       PSB:
                Wire Scanners Details
                       Major Project ongoing for these 8 systems and at this stage , too early to
                        say how far we will get this year. Complex micro-coded Motor Control,
                        new ADC-VD72/INCAA-2MHz (not ICV122) , prototype electronics board,
                        RT-task etc.. Delayed on the whole by 1 year. Manpower problem(Olsfors..)
                        { history: 1 PS type device was installed for test purposes down to 50MeV with 2 regimes
                        :extr. Photomultipliers for secondaries above 200 MeV & secondary emmission from wire
                        for further down to 50 MeV }
                        One milestone is to check one system to work with beam before end of
                        this year. If tests successful, the prototype extended for all 8 systems
                       Involves several persons in very significant manner with high priority


                Image DGTZ for Inj & Ej screens Details:                               Feasible -
                       simplest, for tests : use OTR test method [ needs iris control as well ]
                       Definitive: needs, priorities & definitions with ‘NvideoOS’ or we can
                        continue PCI systems a la carte ( CTF3-Streak C., TT2-OTR, ………………
                        PRIORITY ISSUE & ORGANIZATIONAL
                       [ remember : CCD cameras & RADIATION Hardness - OTR uses semi-rad
                        hard vidicon? ]



PPC-14 Sept 01                                      V Chohan                                                       14
                   Beam Diagnostics - Some Current
                   Topics…per machine or facility
       PS:
                Flying Wire in sections (H)54,64 (V)75,85:
                      M’ment with TREV or Internal timing both possible , one or
                       other [ poor operational applic pgm ? ]
                      influence of beam loss: Can DISTINGUISH secondaries from
                       photomultipliers separately from wire current
                       [APPLICATION ISSUE ]
                      Discrepancy in identical m’ments on same device: ensure
                       same ‘good’ beam, dp/p, intensity, flattop etc   [check:
                       KPriestnall + Uli Raich …..

                Sem-Fils TT2 ( 40 micron gold plated Tungsten wires) :
                                   ( TT2 SemGrids are 3 mm Tungsten strips)

                      Is IN/OUT really needed in PPM ? - one can do without because
                       leaving it in even for high intensity may be OK without affecting
                       beam blowup?
                      For Electron Cloud effect, improvements HAVE BEEN made,
                       particularly with polarisation - but results not too positive ?
                       Next steps?


PPC-14 Sept 01                             V Chohan                                        15
                   Beam Diagnostics - Some Current
                   Topics…per machine or facility
       PS:
                Q Measurement:
                      The present system was designed during 20 bunch era and is
                       based on a half-a sine wave kick and so the phase of the kick
                       was not too critical. Now, for LHC-era beams say with 4
                       bunches (which show much more unequal ampltd response)
                       the kicker phase gets critical (even for Trev synch) & with fine
                       phase adjustments and so the recommendation is to do
                       measurements with sufficient intensity and at least 4
                       equidistant bunches till we get opportunity to replace/renew the
                       system - rectangular pulse like PSB ?, BTF technique ? What
                       DSP?..etc      [ PRIORITY & ORGANIZATIONAL ]


                WCM03 & WCM95 & TT2 WideBand PU’s 208, 228
                      LIMITATIONS at High Intensity (nTOF & CNGS) - Attenuators
                       /power stages get burnt/blown up. BETTER PROTECTION
                       IMPLEMENTED
                      In TT2 difficult to understand ( Radiation? ) what happens
                       because extreme tests (upto 80V) in lab showed no adverse
                       effect .. BETTER PROTECTION IMPLEMENTED
                      USAGE conflicts on PS WCM’s : r.f. PLL controls vs
                       observation Use            [ ORGANISATIONAL ISSUE ]


PPC-14 Sept 01                             V Chohan                                       16
                    Beam Diagnostics - Some Current
                    Topics…per machine or facility
       PS:
                Mean Radial Position evaluation from CODD System:
                        NORMAL CODD m’ments are rejected when this option is chosen - it is
                        one or the other - MRP m’ments done with interval of 5 ms


                CODD - Several operational points

                       harmonic no sequencing: now done directly from Beam Control
                        Timing [ Modifications in Software in CODS done recently ]
                       Vertical Scaling in Display [ Applic Program - ORGANISATIONAL ISSUE]
                      Gate, phase ,Base-line-Restitution Adjustments
                     - procedure/ method : JBelleman on WEB                OR,
                     - EM (CODS) property /modification approach : feasible but needs S/W effort
                       [PRIORITY vs NORMALISER Closed Orbit ]
                     Double-batch Injection Usage : Procedure Available but complex , ELSE
                       MODIFY S/W: [ PRIORITY vs NORMALISER Closed Orbit ]
                     h=21 high energy measurements:
                           Measurements WORK - however at the limit because PLL VCO limits
                            ; Originally was h=20 , now extended - { very large dynamic range h=1
                            to h=20 }

PPC-14 Sept 01                                V Chohan                                              17

								
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