LHC Sector Test. Mike Lamont

Transcription

1 LHC Sector Test Mike Lamont

2 LHC sector test - MAC June 07 2 Outline Overview Motivation Pre-requisites/preparation Tests with beam Organisation Conclusions

3 LHC sector test - MAC June 07 3 Overview TI8 TI8 injection L8 L8 LHCb LHCb -- arc arc IR7 IR7 2 weeks weeks with with beam beam Close Close sectors sectors 8-1, 8-1, and and Beam Beam Pilot Pilot Beam Beam for for the the most most part: part: single single bunch bunch of of x protons protons Total Total intensity: 3 x protons --comparable with with one one nominal intensity LHC LHC extraction from from the the SPS SPS

4 LHC sector test - MAC June 07 4 Injection

5 LHC sector test - MAC June 07 5 Triplets & LHCb Aiming for minimal losses in LHCb

6 LHC sector test - MAC June 07 6 Sector 7-8 X 23

7 LHC sector test - MAC June 07 7 IR7 layout 1. Intercept the beam with the three TCP s and with the TCSG s 2. Invert the polarity of D3 3. Switch OFF all the quadrupoles Stefano Raedelli Ralph Assmann D3 inverted D3 OFF Nominal orbit

8 LHC sector test - MAC June 07 8 Intercepting the beam with the TCP s

9 LHC sector test - MAC June 07 9 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.

10 Motivation

11 LHC sector test - MAC June 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

12 LHC sector test - MAC June Integration & commission with beam: Full-blown system wide integration test

13 LHC sector test - MAC June Beam the ultimate diagnostic Polarity of magnetic elements Aperture in the cold machine Response of key beam instrumentation Magnet field quality "What like a bullet can undeceive?" Herman Melville

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

15 Required circuits

16 LHC sector test - MAC June IR8 RQ5.R8 RQ4.R8 RD2.R8 RD1.R8 RQX.R8 RQX.L8 RD1.L8 RD2.L8 RQ4.L8 RQ5.L8 RQ6.L8 Q5 quadrupole Q4 quadrupole D2 recombination dipole D1 recombination dipole Inner triplet Inner triplet D1 recombination dipole D2 recombination dipole Q4 quadrupole Q5 quadrupole MQM MQML Plus dipole correctors

17 LHC sector test - MAC June 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.

18 LHC sector test - MAC June Arc 7-8 Circuits Number of circuits Main bends MB RB.A 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 Priority

19 LHC sector test - MAC June DS/LSS - right of 7 RQT13.R7B2 RQT12.R7B2 RQTL11.R7B2 RQTL10.R7B2 RQTL9.R7B2 RQTL8.R7B2 RQTL7.R7B2 RQ6.R7B2 QT QT QTLI QTLI QTLI QTLI QTLI 6* QTLH Q7,Q8,Q10,Q11: one MQTL alongside the MQ quadrupole Q9: two MQTLs Plus dipole correctors

20 LHC sector test - MAC June 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

21 LHC sector test - MAC June Other systems Injection elements: septa, kickers Collimators Machine Protection Beam Instrumentation: BPMs, BLMs, BTV, BCT, BST Magnet Model: Transfer functions, harmonics Controls Software/tools Access system Radiation Protection Radiation Monitoring Optics, aperture model Sector Test is another progressive milestone to be used for testing key functionality Work in progress but most of this is in good shape. Effort in these areas is essentially orthogonal to HWC.

22 LHC sector test - MAC June Access Sector Sector Interlocked gate gate right right of of IP IP 6 Point Point 7 (PM76) (PM76) Access Access system system operational. Point Point 8 (PM85) (PM85) Access Access point point fully fully operational. PZ85 PZ85 Interlocked door door in in shielding wall wall Sector Sector 1-8: 1-8: Interlocked gate gate left left of of IP IP 1 Final Configuration

23 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. LHC sector test - MAC June 07 23

24 Beam

25 LHC sector test - MAC June Commission injection region Steer into ring, onto TDI Check instrumentation, septa, kickers, aperture D2 Q5 BTVSS Jan Uythoven

26 LHC sector test - MAC June Thread to IR7 Commission trajectory acquisition and correction Thread beam Jorg Wenninger

27 LHC sector test - MAC June Linear optics measurements Trajectory response using correctors and BPMs BPM + corrector polarity and calibration errors Phase, coupling Dispersion measurement with δp and BPMs Betatron matching measurement with BTVs

28 LHC sector test - MAC June 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

29 5. Aperture measurement First iteration : oscillation from 2 correctors at 90º to probe all phases Second iteration if needed/time : π bumps (local anomalies, specific regions) MSI TI 8 and sector 7-8 V-aperture and 8 σ oscillation Nσ X aperture S [m ] Brennan Goddard LHC sector test - MAC June 07 29

30 6. Momentum Aperture Transmission vs momentum offset by changing SPS RF frequency Re-scale TI 8 to new momentum x [m] X 0.01 δp/p = (1μm ε n ) S [m ] LHC sector test - MAC June 07 30

31 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 μrad H kick (top) and 40 μrad V kick (bottom) Jorg Wenninger LHC sector test - MAC June 07 31

32 LHC sector test - MAC June Effects of magnetic cycle Machine reproducibility and persistent current effects at injection for reduced pre-cycle

33 LHC sector test - MAC June 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

34 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 LHC sector test - MAC June 07 34

35 LHC sector test - MAC June End TI8, Injection Steering, commission BDI, timing Trajectory acquisition commissioning, trajectory correction, threading, energy Linear Optics from kick/trajectory, coupling, BPM polarity checks, corrector polarity checks Priority Duration Intensity # shots Intensity h p+ p E E E E E E+12 4 Check BLM system 1 6 5E E+11 5 Aperture limits, acceptance E E+12 6 Momentum aperture 1 6 5E E+11 7 Field errors (high statistics) E E+12 8 Determination of quench level - calibrate BLMs E E+12 9 Beam tests - summary Effects of magnetic cycle, variations during decay, reproducibility E E Energy offset versus time on FB E E Transfer line collimation studies - TCDI 2 6 5E E Injection protection studies - TDI 2 6 5E E IR bumps, aperture, separation, crossing angle bumps 3 6 5E E+11 TOTAL E+13 On to TCP DAYS 8 6.5E+12 On to TDI 4.0E+12 On to TCDI

36 LHC sector test - MAC June Near test schedule Phase Sector checkout, interlock & machine protection tests etc. Close sectors 6-7, 7-8, 8-1 Access system tests & qualification Beam to end TI8 Tests with beam Radiation survey Establish supervised areas Time T start - 2 weeks T start 3 day T start 2 day T start 1 day 2 weeks T end + 1 day T end + 2 day

37 Schedule Consolidation. Operation testing of available sectors Machine Checkout Beam Commissioning to 7 TeV Interconnection of the continuous cryostat Leak tests of the last sub-sectors Global pressure test &Consolidation Flushing Warm up Powering Tests Inner Triplets repairs & interconnections Cool-down. LHC sector test - MAC June 07 37

38 LHC sector test - MAC June 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

39 LHC sector test - MAC June 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

40 LHC sector test - MAC June Details Sector test with beam Overview, motivation and scheduling Proposed tests with beam Magnet quenches with beam Beam Instrumentation Magnet requirements Controls requirements Sector test preparation Planning Global Hardware Status Layout in LSS7 Hardware Commissioning State of LHCb for the test Radiation Issues Access system Chamonix 2006 Mike Lamont Brennan Goddard Alex Koschik Lars Jensen Luca Bottura Robin Lauckner Chair: Pierre Strubin Esther Barbero Soto Miguel Jimenez Jan Uythoven Roberto Saban Massimiliano Ferro-Luzzi Helmut Vincke Pierre Ninin Team in place which is examining implications, requirements and details of planned beam tests

41 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. LHC sector test - MAC June 07 41

42 LHC sector test - MAC June 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.