FGC Software Design Review - LHC Machine Advisory Committee

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					LHC Sector Test

Mike Lamont
     Outline

               Overview
               Motivation
               Pre-requisites/preparation
               Tests with beam
               Organisation
               Conclusions




14/6/2007                 LHC sector test - MAC June 07   2
     Overview…
    TI8 – injection L8 – LHCb - arc 7-8 – IR7
    2 weeks with beam
    Close sectors 8-1, 7-8 and 6-7
    Beam
       Pilot Beam for the most part:
            single bunch of 5 - 10 x 109 protons

       Total intensity:
            3 x 1013 protons - comparable with one nominal
              intensity LHC extraction from the SPS




14/6/2007                        LHC sector test - MAC June 07   3
     Injection




14/6/2007        LHC sector test - MAC June 07   4
     Triplets & LHCb




                Aiming for minimal losses in LHCb
14/6/2007              LHC sector test - MAC June 07   5
     Sector 7-8




                                                  X 23




14/6/2007         LHC sector test - MAC June 07      6
     IR7 layout
    1. Intercept the beam with the three TCP’s and with the TCSG’s
    2. Invert the polarity of D3
                                                    Stefano Raedelli
    3. Switch OFF all the quadrupoles               Ralph Assmann


                                                              D3 inverted

                                                                  D3 OFF



                                                            Nominal orbit




14/6/2007                   LHC sector test - MAC June 07                   7
     Intercepting the beam with the TCP’s




14/6/2007          LHC sector test - MAC June 07   8
     IR7
           Three TCPs closed “smartly”, D3 in opposite polarity,
            quadrupoles off
               All beam particles interact with >1m of C (typical=1.8m; max=3m)
               Additional protection from the next secondary collimators


           EM showers are expected to be absorbed by MBW and
            MQW yokes (no issues for magnet). Detailed estimates
            should confirm that.

           Minimum impact on the machine:
                - D3 polarity change (cable).
                - Lock collimators in position
                - Local activation - simulations to be performed.

14/6/2007                          LHC sector test - MAC June 07                   9
Motivation
     Integration
               Full test of a majority of subsystems over more than
                one eighth of the ring

               Allows staged approach to the full problem space

               Time to fully resolve problems before the real thing
                   Analysis, improvements, resolution, adjustment


               The lessons learnt will reduce the time needed for
                full commissioning

                      Buys breathing space if there are
                           any serious problems
14/6/2007                          LHC sector test - MAC June 07       11
     Integration & commission with beam:




            Full-blown system wide integration test
14/6/2007                LHC sector test - MAC June 07   12
     Beam – the ultimate diagnostic

   Polarityof magnetic elements
   Aperture in the cold machine
   Response of key beam instrumentation
   Magnet field quality

            "What like a bullet can undeceive?" Herman Melville




14/6/2007                   LHC sector test - MAC June 07         13
     Milestone
               Machine Protection
               Controls++
               Magnets (model etc.)
               Beam Instrumentation
               BT: Kickers, Septa, TDI
               Collimation
               Radiation Protection
               Access
               Operations
               Hardware Commissioning


14/6/2007                      LHC sector test - MAC June 07   14
Required circuits
     IR8
            RQ5.R8 Q5 quadrupole
            RQ4.R8 Q4 quadrupole
            RD2.R8 D2 recombination dipole
            RD1.R8 D1 recombination dipole
            RQX.R8 Inner triplet
            RQX.L8 Inner triplet
            RD1.L8   D1 recombination dipole
            RD2.L8   D2 recombination dipole
            RQ4.L8 Q4 quadrupole
            RQ5.L8 Q5 quadrupole
            RQ6.L8 MQM MQML

                                                        Plus dipole correctors


14/6/2007               LHC sector test - MAC June 07                            16
     DS left IP8
        RQ7.L8           2*MQM
        RQ8.L8           MQML
        RQ9.L8           MQM MQMC
        RQ10.L8          MQML
        RQTL11.L8B2      MQTLI
        RQT12.L8B2       MQT
        RQT13.L8B2       MQT                             Plus dipole correctors



       • Item: Two lips, indifferent red
       • Item: Two grey eyes with lids to them
       • Item: One neck, one chin, and so forth.

14/6/2007                       LHC sector test - MAC June 07                     17
     Arc 7-8
                                                             Number of
                                Circuits                                   Priority
                                                             circuits
  Main bends           MB       RB.A78                       1             1
  Main quads           MQ       RQF, RQD                     2             1
  Skew quads           MQS      RQS [B2]                     1             1
  Trim quads           MQT      RQTF,RQTD [B2] 2                           1
  Orbit correctors     MCB      RCB [B2]                     23 H & 24 V   1
  Lattice sextupoles   MS       RSF,RSD [B2]                 4             2
  Lattice octupoles    MO       ROD, ROF [B2]                1             3
  Skew sextupoles      MSS      RSS [B2]                     1             3
  b3 spool             MCS      RCS [B2]                     1             3
  b4 spool             MCO      RCO [B2]                     1             3
  b5 spool             MCD      RCD [B2]                     1             3

14/6/2007                    LHC sector test - MAC June 07                            18
     DS/LSS - right of 7
            RQT13.R7B2       QT
                                                     Q7,Q8,Q10,Q11: one
            RQT12.R7B2       QT
                                                     MQTL alongside the MQ
                                                     quadrupole
            RQTL11.R7B2      QTLI

            RQTL10.R7B2      QTLI                    Q9: two MQTLs

            RQTL9.R7B2       QTLI
                                                          Plus dipole correctors
            RQTL8.R7B2       QTLI

            RQTL7.R7B2       QTLI

            RQ6.R7B2         6* QTLH


14/6/2007                 LHC sector test - MAC June 07                            19
     Required circuits
           To get beam through sector 78, the main
            circuits listed above are required to be
            commissioned to 450 GeV.

           For limited recycling, it would be preferable for listed
            circuits to be available to, say, the equivalent 1 TeV
            level.


             • Beam 2 Circuits only

             • Circuits commissioned to 450 GeV+ only


14/6/2007                       LHC sector test - MAC June 07          20
     Other systems
           Injection elements: septa, kickers
           Collimators
           Machine Protection
           Beam Instrumentation:
               BPMs, BLMs, BTV, BCT, BST
           Magnet Model:
               Transfer functions, harmonics
           Controls                                          Sector Test is another
                                                           progressive milestone to be
           Software/tools
                                                         used for testing key functionality
           Access system
           Radiation Protection                         Work in progress but most of
           Radiation Monitoring                            this is in good shape.

           Optics, aperture model                         Effort in these areas is
                                                       essentially orthogonal to HWC.
14/6/2007                          LHC sector test - MAC June 07                          21
     Access
     Sector 6-7.
        Interlocked gate right of IP 6
     Point 7 (PM76)
        Access system operational.
     Point 8 (PM85)
        Access point fully operational.
     PZ85
        Interlocked door in shielding wall
     Sector 1-8:
        Interlocked gate left of IP 1


                          Final Configuration




14/6/2007                          LHC sector test - MAC June 07   22
      Radiation Protection
      All major installation will have finished and access to the
       zones affected after the test will be limited.
      Dose maps for collimators in IR7 to be carefully evaluated.
      Given analysis, and measurements during and after the
       test, it is envisaged that:
           Certain areas might be declared controlled areas for the first few
            days after the test;
           Thereafter these areas would join the rest of the sectors involved
            as supervised areas
           LHCb remains an undesignated area


      Traceability restrictions come into force
      Need for additional RP instrumentation to be evaluated.
                          Work in progress. NB amount of beam is minimal.
14/6/2007                        LHC sector test - MAC June 07                   23
Beam
     1. Commission injection region
           Steer into ring, onto TDI
           Check instrumentation, septa, kickers, aperture…




                                         D2                   Q5
                                                                   BTVSS




                                                                   Jan Uythoven



14/6/2007                     LHC sector test - MAC June 07                       25
     2. Thread to IR7
           Commission trajectory acquisition and correction
           Thread beam




     Jorg Wenninger


14/6/2007                    LHC sector test - MAC June 07     26
     3. Linear optics measurements
           Trajectory response using correctors and BPMs
               BPM + corrector polarity and calibration errors
               Phase, coupling
           Dispersion measurement with dp and BPMs
           Betatron matching measurement with BTVs




14/6/2007                           LHC sector test - MAC June 07   27
     4. BLM system tests
           Get the system up and running, recording losses
               Prior calibration with source: expect reasonable numbers
               Acquisition & display of beam losses
               Some crosstalk studies possible (in principle ‘beam 1’ monitors
                available…)




                                                                   Bernd Dehning


14/6/2007                          LHC sector test - MAC June 07                   28
              5. Aperture measurement
                        First iteration : oscillation from 2 correctors at 90º to
                         probe ‘all’ phases
                        Second iteration if needed/time : p bumps (local
                         anomalies, specific regions)


                                         MSI            TI 8 and sector 7-8 V-aperture and 8 s oscillation
     20
                                                                                                                                       X aperture
Ns




     15

     10

      5

      0

      -5

     -10

     -15

     -20
       1500       1750     2000   2250    2500   2750    3000    3250   3500   3750   4000   4250   4500   4750   5000   5250   5500      5750        6000
                                                                                                                                                     S [m ]



                                                                                                                         Brennan Goddard




     14/6/2007                                                  LHC sector test - MAC June 07                                                       29
           6. Momentum Aperture
                  Transmission vs momentum offset by changing SPS RF
                   frequency
                  Re-scale TI 8 to new momentum


           0.03
   x [m]




                                                                                                                                       X

           0.02


           0.01
                                                                              dp/p = 0.004 (1mm en)
               0



           -0.01


           -0.02



           -0.03
               1500   1750   2000   2250   2500   2750   3000   3250   3500    3750   4000   4250   4500   4750   5000   5250   5500       5750     6000
                                                                                                                                                  S [m ]




14/6/2007                                                   LHC sector test - MAC June 07                                                                  30
     7. Field quality checks
           Kick-response and trajectory analysis
           LOCO – might be able to get a handle on average a2, b2
            and b3 field errors of MBs, b2 of MQs
               Possibly extend method to check multipole corrector polarities (possibly via
                strong excitation))




                                      MB b3 field error effect (mean -9.6 units, rms
                                      1.4 units). H trajectory change for 40 mrad H
                                      kick (top) and 40 mrad V kick (bottom)           Jorg Wenninger

14/6/2007                                  LHC sector test - MAC June 07                                31
     8. Effects of magnetic cycle
           Machine reproducibility and persistent current effects at
            injection for reduced pre-cycle




14/6/2007                       LHC sector test - MAC June 07           32
9. Quench limits and BLM response
   Quenches with beam motivation:
            - safe and efficient operation
            - avoid quenches and damage

  Controlled, well defined tests to establish:
     Absolute quench limits
     BLM threshold values
     Model and understanding of correlation
     of loss pattern, quench level, BLM
     signals


   Test important for efficient commissioning
     of BLM system with circulating beam


14/6/2007                      LHC sector test - MAC June 07   33
     Other possibilities…
           10. Energy offset versus time on flat bottom
           11. Transfer line collimation studies
           12. Injection projection studies
           13. Separation and crossing angle bumps
               Injecting onto vertical separation bump
               Bump closure, induced dispersion, aperture
           14. Commission multi-bunch injection




14/6/2007                          LHC sector test - MAC June 07   34
        Beam tests - summary
                                                         Priority Duration   Intensity   # shots    Intensity
                                                                      h           p+                      p+
        End TI8, Injection Steering, commission BDI,
   1                                                        1          24      5E+09        500       2.5E+12
        timing
        Trajectory acquisition commissioning,
   2                                                        1          24      5E+09        500       2.5E+12
        trajectory correction, threading, energy
        Linear Optics from kick/trajectory, coupling,
   3                                                        1          12      1E+10        400       4.0E+12
        BPM polarity checks, corrector polarity checks
   4    Check BLM system                                    1          6       5E+09        100       5.0E+11

   5    Aperture limits, acceptance                         1          18      5E+09       1000       5.0E+12

   6    Momentum aperture                                   1          6       5E+09        100       5.0E+11

   7    Field errors (high statistics)                      2          12      2E+10        200       4.0E+12

   8    Determination of quench level - calibrate BLMs      1          36      2E+11        20        4.0E+12
        Effects of magnetic cycle, variations during
   9                                                        1          24      5E+09        300       1.5E+12
        decay, reproducibility
   10 Energy offset versus time on FB                       2          12      3E+10        100       3.0E+12

   11 Transfer line collimation studies - TCDI              2          6       5E+09        800       4.0E+12

   12 Injection protection studies - TDI                    2          6       5E+09        800       4.0E+12
        IR bumps, aperture, separation, crossing angle
   13                                                       3          6       5E+09        100       5.0E+11
        bumps

        TOTAL                                                    192                     4920      2.6E+13       On to TCP
        DAYS                                                     8                                 6.5E+12       On to TDI
                                                                                                   4.0E+12       On to TCDI

14/6/2007                                              LHC sector test - MAC June 07                                          35
     Near test schedule

            Phase                                                 Time
            Sector checkout, interlock & machine
                                                                  Tstart - 2 weeks
            protection tests etc.
            Close sectors 6-7, 7-8, 8-1                           Tstart– 3 day
            Access system tests & qualification                   Tstart – 2 day
            Beam to end TI8                                       Tstart – 1 day
            Tests with beam                                       2 weeks
            Radiation survey                                      Tend + 1 day
            Establish supervised areas                            Tend + 2 day




14/6/2007                         LHC sector test - MAC June 07                      36
     Schedule
                   12            23            34           45            56            67            78           81
    Mar.                                                                                                                      Mar.
    Apr.                                                                                                                      Apr.
    May                                                                                                                       May
    Jun.                                                                                                                      Jun.
    Jul.                                                                                                                      Jul.
    Aug.                                                                                                                      Aug.
    Sep.                                                                                                                      Sep.
    Oct.                                                                                                                      Oct.
    Nov.                                                                                                                      Nov.
    Dec.                                                                                                                      Dec.
                                                                   .
    Jan.                                                                                                                      Jan.
    Feb.                                                                                                                      Feb.
    Mar.                                                                 Operation testing of available sectors               Mar.
    Apr.                                                                                                                      Apr.
                             Machine                                                                Checkout
    May                                                                                                                       May
    Jun.                                        Beam Commissioning to 7 TeV                                                   Jun.
    Jul.                                                                                                                      Jul.
    Aug.                                                                                                                      Aug.
    Sep.                                                                                                                      Sep.
            Interconnection of the continuous cryostat        Global pressure test &Consolidation            Warm up
    Oct.                                                                                                                      Oct.
    Nov. Leak tests of the last sub-sectors                   Flushing                                       Powering Tests   Nov.
    Dec. Inner Triplets repairs & interconnections            Cool-down                                                       Dec.
                                                                   .
14/6/2007                                           LHC sector test - MAC June 07                                              37
     Impact 1/2
           Given the state of installation, the sector test should
            have minimal impact on transport, interconnection work
            etc.
           Deliberately chosen solution in IR7 which avoids
            additional interventions

           Restricted access to sectors 8-1, 7-8, 6-7 during beam
            tests ~ 14 days
           7-8 and injection region part of 8-1 become supervised
            areas after test (film badge etc.)

           Work/Commissioning can clearly continue in other
            sectors during the test

14/6/2007                      LHC sector test - MAC June 07          38
     Impact 2/2
           Sector test makes clear demands on:
               what is needed to be cold
               on what is needed to be hardware commissioned
               and to what level


           Cryogenics, QPS, HWC support required during test

           Could take time out of HWC program
               HWC would have to stop in 7-8 during test


           Test preparation, other than cold mass, largely
            orthogonal to HWC

14/6/2007                          LHC sector test - MAC June 07   39
     Details                                       Chamonix 2006
Sector test with beam
Overview, motivation and scheduling         Mike Lamont
Proposed tests with beam                    Brennan Goddard
Magnet quenches with beam                   Alex Koschik
Beam Instrumentation                        Lars Jensen
Magnet requirements                         Luca Bottura
Controls requirements                       Robin Lauckner
Sector test preparation                     Chair: Pierre Strubin
Planning                                    Esther Barbero Soto
Global Hardware Status                      Miguel Jimenez
Layout in LSS7                              Jan Uythoven
                                                                       Team in place which
Hardware Commissioning                      Roberto Saban                 is examining
State of LHCb for the test                  Massimiliano Ferro-Luzzi      implications,
Radiation Issues                            Helmut Vincke               requirements and
                                                                        details of planned
Access system                               Pierre Ninin
                                                                           beam tests
http://cern.ch/lhc-injection-test/
14/6/2007                             LHC sector test - MAC June 07                      40
     Conclusions
           A sector test is surely a very useful exercise
               Undoubtedly speed full commissioning
           It could prove to be a vital exercise
               If any major problems are uncovered
           Requirements have clearly stated and are being
            addressed
           Planned beam tests have been detailed

           The potential impact would be minimal.
               Machine as is or as will be. Work carries on elsewhere.
               However, for the test to take place this year (if the schedule
                allows) Hardware Commissioning would have to be tailored to
                provide necessary circuits to the necessary level.

14/6/2007                          LHC sector test - MAC June 07                 41
     Acknowledgements
     Magnets                     Luca Bottura
     Beam Instrumentation        Rhodri Jones, Lars Jensen, Stephen Jackson
     Injection                   Brennan Goddard, Jan Uythoven
     Radiation Protection        Doris Forkel-Wirth, Helmut Vincke
     INB                         Ghislain Roy
     Access                      Pierre Ninin
     LHCb                        Rolf Linder
     HWC                         Roberto Saban & team
     Installation                Katy Foraz
     Planning                    Esther Barbero Soto
     Vacuum                      Paul Cruikshank, Miguel Jimenez
     Controls                    Robin Lauckner ++
     OP/AP                       Roger Bailey, Verena Kain, Massimo
                                  Giovannozzi, Stephane Fartoukh, Helmut
                                  Burkhardt, Alex Koshick, Stefano Raedelli, Ralph
                                  Assmann, Frank Zimmerman… and the rest of
                                  the commissioning team.
14/6/2007                    LHC sector test - MAC June 07                       42

				
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