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LHC Sector Test

LHC Sector Test. Mike Lamont. Outline. Overview Motivation Pre-requisites/preparation Tests with beam Organisation Conclusions. 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:

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LHC Sector Test

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  1. LHC Sector Test Mike Lamont

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

  3. 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 LHC sector test - MAC June 07

  4. Injection LHC sector test - MAC June 07

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

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

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

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

  10. Motivation

  11. 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 LHC sector test - MAC June 07

  12. Integration & commission with beam: Full-blown system wide integration test LHC sector test - MAC June 07

  13. 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 LHC sector test - MAC June 07

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

  15. Required circuits

  16. IR8 Plus dipole correctors LHC sector test - MAC June 07

  17. DS left IP8 Plus dipole correctors • Item: Two lips, indifferent red • Item: Two grey eyes with lids to them • Item: One neck, one chin, and so forth. LHC sector test - MAC June 07

  18. Arc 7-8 LHC sector test - MAC June 07

  19. DS/LSS - right of 7 Q7,Q8,Q10,Q11: one MQTL alongside the MQ quadrupole Q9: two MQTLs Plus dipole correctors LHC sector test - MAC June 07

  20. 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 LHC sector test - MAC June 07

  21. 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. LHC sector test - MAC June 07

  22. 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 LHC sector test - MAC June 07

  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

  24. Beam

  25. D2 Q5 BTVSS 1. Commission injection region • Steer into ring, onto TDI • Check instrumentation, septa, kickers, aperture… Jan Uythoven LHC sector test - MAC June 07

  26. 2. Thread to IR7 • Commission trajectory acquisition and correction • Thread beam Jorg Wenninger LHC sector test - MAC June 07

  27. 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 LHC sector test - MAC June 07

  28. 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 LHC sector test - MAC June 07

  29. MSI TI 8 and sector 7-8 V-aperture and 8 s oscillation 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) Brennan Goddard LHC sector test - MAC June 07

  30. 6. Momentum Aperture • Transmission vs momentum offset by changing SPS RF frequency • Re-scale TI 8 to new momentum dp/p = 0.004 (1mm en) LHC sector test - MAC June 07

  31. 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) 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)) Jorg Wenninger LHC sector test - MAC June 07

  32. 8. Effects of magnetic cycle • Machine reproducibility and persistent current effects at injection for reduced pre-cycle LHC sector test - MAC June 07

  33. 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 LHC sector test - MAC June 07

  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

  35. Beam tests - summary LHC sector test - MAC June 07

  36. Near test schedule LHC sector test - MAC June 07

  37. 12 23 34 45 56 67 78 81 Consolidation Operationtesting of availablesectors Machine Checkout BeamCommissioning to 7 TeV Interconnection of the continuous cryostat Global pressure test &Consolidation Warm up Leak tests of the last sub-sectors Flushing Powering Tests Inner Triplets repairs & interconnections Cool-down Schedule 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. Mar. Apr. Apr. May May Jun. Jun. Jul. Jul. Aug. Aug. Sep. Sep. Oct. Oct. Nov. Nov. Dec. Dec. . LHC sector test - MAC June 07

  38. 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 LHC sector test - MAC June 07

  39. 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 LHC sector test - MAC June 07

  40. Details Chamonix 2006 Team in place which is examining implications, requirements and details of planned beam tests http://cern.ch/lhc-injection-test/ LHC sector test - MAC June 07

  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

  42. 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. LHC sector test - MAC June 07

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