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first thoughts on MD Priorities for 2012

first thoughts on MD Priorities for 2012. Frank Zimmermann, Ralph Assmann , Giulia Papotti 2012 LHC Operation Workshop Evian, 12-14 December 2012.

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first thoughts on MD Priorities for 2012

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  1. first thoughts on MD Priorities for 2012 Frank Zimmermann, Ralph Assmann, Giulia Papotti 2012 LHC Operation Workshop Evian, 12-14 December 2012 many thanks for input from GianluigiArduini, Philippe Baudrenghien, Chiara Bracco, Roderik Bruce, Oliver Brüning, Florian Burkart, Helmut Burkhardt, StephaneFartoukh, Werner Herr, John Jowett, Verena Kain, Mike Lamont, Elias Metral, Nicolas Mounet, Lene Norderhaug Drosdal, Yannis Papaphilippou, Federico Roncarolo, Mariusz Sapinski, MarekStrzelczyk, Rogelio Tomas, Georges Trad, David Valuch, LSWG ++

  2. 2011 MD highlights • many outstanding results • high beam-beam tune shift: 0.034 total in two IPs • high brightness beam: 1 micron beam with 2x1011 ppb • high bunch intensity 2.5x1011 protons; all instrumentation working • 25-ns beams up to 2100 bunches • injection of 288 nominal bunches • tight collimation settings • 0.5 MW beam losses at collimators w/o quench • p-PbMD: feasibility of mixed beams in LHC • high pile-up of up to 35 events per crossing • ATS optics b* down 40 cm • UFO events much faster than expected from gravity • limiting IR aperture factor ~1.5 bigger than expected • documentation in ~30MD notes • coordination w. injectors worked extremely well (Giulia & Giovanni)

  3. MD Results: Bunch Intensity & Emittance Ralph Assmann, C-MAC 22 August 2011

  4. 2011 MD Notes BI MD studies on August 25th 2011, D. Belohradet al, CERN-ATS-Note-2011-130 MD End-of-fill study on collimator tight settings , R. Assmannet al, CERN-ATS-Note-2011-125 MD Optics measurement and correction close to the half integer resonance, R. Calaga et al,CERN-ATS-Note-2011-124 MD. - 2011. Results of long range beam-beam studies and observations during operation in the LHC, Alemany et al, CERN-ATS-Note-2011- 120 MD IR1 and IR5 aperture at 3.5 TeV, C. Alabau Pons,,CERN-ATS-Note-2011-110 MD Beam parameters observations during a high pile-up collisions fill, G. Tradet al, CERN-ATS-Note-2011-105 MD Longitudinal Oscillations with Batch Injection in the LHC, T. Argyropoulos et al, CERN-ATS-Note-2011-031 MD Dependence of single beam lifetime on bunch length, P. Baudrenghien et al, CERN-ATS-Note-2011-083 MD Tight collimator settings with beta* = 1.0 m, R. Assmann et al, CERN-ATS-Note-2011-079 MD. R2E-related MD: slow controlled losses for RadMon/BLM cross-checks , M. Calviani et al, CERN-ATS-Note-2011-070 MD BI MD Studies on June 29th 2011, D,Belohrad et al.CERN-ATS-Note-2011-069 MD Quench Margin at Injection, W. Bartmann et al, CERN-ATS-Note-2011-067 MD MKI UFOs at Injection, T. Baer et al, CERN-ATS-Note-2011-065 MD MD on Injection Quality – Longitudinal and Transverse Parameters , L. Drosdal et al, CERN-ATS-Note-2011-063 MD Improving LHC Collimator Setup Efficiency at 3.5 TeV, Assmann et al, CERN-ATS-Note-2011-062 MD IR3 combined cleaning test at 3.5 TeV, R. Assmann et al, CERN-ATS-Note-2011-061 MD. LHC Transvers Profile Monitors studies (MD on May 6th, 2011), E. Bravin et al, CERN-ATS-Note-2011-049 MD Transverse coupled-bunch instability rise times in the LHC at injection and top energy, N. Mounet et al, CERN-ATS-Note-2011- 035 MD Head-on beam-beam tune shifts with high brightness beams in the LHC, R. Alemanyet al, CERN-ATS-Note-2011-029 MD Test of luminosity levelling with separated collisions , R. Alemany et al, CERN-ATS-Note-2011-028 MD 50 and 75 ns operation in the LHC: Vacuum and Cryogenics observations, G. Arduiniet al, CERN-ATS-Note-2011-046 MD BPM Offset Determination by Sinusoidal QuadrupoleK-modulation, T. Baer et al, CERN-ATS-Note-2011-043 MD The Achromatic Telescopic Squeezing (ATS) MD part I, S. Fartoukh et al, CERN-ATS-Note-2011-033 MD Summary of MD on nominal collimator settings, R. Assmannet al, CERN-ATS-Note-2011-036 MD Un-squeeze to 90 m, H. Burkhardtet al, CERN-ATS-Note-2011-032 MD Collimator losses in the DS of IR7 and quench test at 3.5 TeV, R. Assmann et al,CERN-ATS-Note-2011-042 MD Studies of longitudinal single bunch stability, T. Argyropoulos et al, CERN-ATS-Note-2011-041 MD TI8 shielding studies and angular alignment of TDI and TCDQ, W. Bartmann et al, CERN-ATS-Note-2011-040 MD

  5. 2011 MD review:how much time was allocated* per topic electron cloud: 62 h injection & inj. protection: 50 h ATS optics: 47 h beam-beam: 40.5 h BI: 40 h collimation: 34 h RF&longit. dynamics: 34 h magnets incl. quench tests: 31 h b*=1 m (opt+coll): 22 h IR MDs: 18 h nonlinear dynamics: 18 h impedance: 10 (15) h b*=90 m: 10 h UFO studies: 8 (16) h collisions tunes at inj. & ramp: 8 h R2E: 8 h 1/2 integer tune: 8 h p-Pbfeasibility: 8 h TDI vacuum: 8 combined ramp & squeeze: 8 h high pile up: 7 h ADT blow up at injection: 6 h p-p rephasing: 6 h beam shape: 2 h *beam may not have been available for all the time

  6. 2012 schedule 4 MD blocks of 5 days each, and 2x24 h floating MDs

  7. 2012 MD requests MD requests for 2012 submitted in November & December 2011 76 requests in total total time requested: 913.5 h available time: 528 h

  8. distribution of MD requests

  9. Optics MD Requests (106 h) ATS optics: 16 h Tune close to ½ integer: 16 h Compensation of IR nonlinearities: 12 h Nonlinear beam dynamics: 12 h Movements IT with beams at injection: 8 h RF cavity nonlinearities: 16 h Aperture measurements at 3.5 TeV w ADT blow up: 8 h LHC linear chromaticity: 6 h Chromaticity measurement w. longitudinal kick: 8 h

  10. Beam-Beam MD Requests (136 h) Head-on beam-beam limit w unequal beams: 16 h Beam-beam limit for LR separation: 24 h Beam-beam limit for LR intensity: 8 h Large Piwinski angle: 16 h Transverse noise & coherent beam-beam: 16 h Beam-beam emittance growth due to transverse noise: 16 h LR beam-beam with flat beams: 24 h HV passive compensation: 16 h

  11. Collimation MD Requests (120 h) Chromatic aberrations & collimation: 8 h Asynchronous dump in collimation set up: 8 h Scraping scan for beam shape: 8 h Collimation studies with different settings: 24 h Scraping with tune excitation: 16 h Loss maps with transverse damper: 8 h Collimation with beta*=40 cm: 8 h Fast collimator setup at 3.5 TeV: 8 h Proton collimation loss mitigation: 16 h Collimation cleaning eff. on ramp w ADT blow up: 8 h Fast beam losses at the collimators: 8 h

  12. ADT MD Requests (18 h) Detector MD Requests (16 h) High pile up: 8 h Luminosity levelling with beta* change: 8 h Noise properties of ADT with FB on and off: 6 h Residual tune signal in damper signal: 6 h ADT Q/Q’ diagnostics compatibility: 6 h

  13. Impedance&Inst. MD Requests (110 h) TCBI at flat top and octupole stabilization: 20 h Impedance budget at injection: 6 h Multibunch tune shift at flat top: 8 h Multibunch tune shift at injection: 8 h Probing the single bunch limits in LHC: 6 h LHC transverse impedance: 10 h Impedance and beam heating of long protection devices: 16 h Intensity limitations for 25 ns operation: 24 h Effective longitudinal broadband impedance: 6 h Loss of Landau damping during ramp: 6 h

  14. Emittance Growth MD Requests (38 h) Source of transverse emittance blow up: 16 h Transverse emittance blow up at injection: 10 h Optimization of ADT in the ramp: 12 h High beta* MD Requests (16 h) De-squeeze to beta*=500 m: 8 h Scraping to 1 micron emittance at top energy: 8 h

  15. Quench Threshold MD Requests (56 h) Quench margin at top energy in DS of IR7 &IR3: 16 h Quench limit investigations with beam at injection at Q6.L8 & Q4.L6: 16 h Wire scanner quench test at flat top for ms losses: 8 h Quench test at injection energy for MQ/MB with horizontal bump: 8 h Quench test at nominal energy at C14R2 with bumps: 8 h

  16. Injection MD Requests (80 h) Beam losses at injection: 16 h Protection from long devices: 16 h Injection matching & emittance preservation: 16 h LHC transfer line stability: 16 h Transfer and injection of high brightness bunches with SPS Q20: 16 h

  17. RF MD Requests (68 h) Longitudinal blow up studies: 16 h RF feedback optimization with circulating beam: 4 h Commissioning of longitudinal damper: 16 h Longitudinal stability for batch: 16 h Voltage modulation to minimize klystron power: 16 h

  18. Ion MD Requests (40 h) Ion collimation loss mitigation: 16 h Proton lead intensity limit: 16 h Commissioning of p-Pbrephasing using p: 8 h Other MD Requests (108 h) BI MDs: 36 h UFO MDs: 8 h Operational development MD: 48 h Sensitivity of QPS thresholds to FB systems: 8 h Combined ramp & Squeeze: 8 h

  19. EOF MD Requests (>2.5 h) Halo scraping: 0.5 h TCBI at flat top and injection: 1 h Single bunch parameter evolution: ? Automatic K modulation for beta*: 1 h Chromaticity decay at flat top: 3 h SOF MD Requests (3 h)

  20. MPS classes #requests • class A: setup beams • automatically approved • class B: unsafe beams with physics conditions, any energy • (no changes of optics or orbit) • to be approved on a case by case by rMPP (“quick approval”) • class C : unsafe beams and changes of orbit/optics • safe and controlled machine conditions must first be established with Setup Beams • approval with EDMS document including: • responsibilities to establish and validate new beam conditions (eventually including orbit/optics changes) • detailed description of the steps during the MD • the steps and responsibilities to re-establish and validate nominal conditions after the MD • class D: unsafe beams involving new ‘machine territory’ – drastic changes of the optics, WP… • downgraded to Setup Beam unless full failure analysis is performed, in which case the MD is moved to class C 19 34 22 1

  21. 2012 main MD themes these MDs should come early [time in hours]

  22. Theme 1: pushing performance in 2012 • beam transfer • - injection lines, transfer stability, injection protection • BI MDs • operational efficiency • - combined ramp & squeeze • emittance growth at injection and ramp • emittancegrowth in collision • - beam-beam & noise • - collisions without ADT or different ADT gains • p-Pb MDs • - p-Pb feasibility • - p-Pb phasing with protons • - ATS IBS studies (no MD request)

  23. Theme 2: preparing for 2014/15 • 6.5 TeV energy • - quench margin; combined ramp & squeeze; BI limits • - collimation: nominal 6.5/7-TeV settings • high pile up • - ATS optics, collimation w b*=40 cm & low emittance • 25 ns (after scrubbing) • - (electron cloud, UFOs) • - long-range beam-beam effects • - maximum current (vacuum, cryo, impedance) • - RF & longitudinal dynamics MDs • shorter bunches • - heating, vacuum, loss of Landau damping • high beta* optics • - maximum b*, injection w. b*=200 m, ATS de-squeeze

  24. Theme 3: towards maximum luminosity • SPS Q20 optics • - transfer and injection matching • ATS optics • enhanced Landau damping • (beam-beam limit for ATS) • effect on IBS rates • collimation MDs • maximum acceptable chromatic aberrations • halo diffusion control by tune mod., loss mitigation • beam-beam limits & optimization • HV passive compensation • half integer tune, flat beams • large Piwinskiangle • alternative leveling methods

  25. possible improvements for 2012 • more EOF MDs • SOF MDs • make use of intensity increase • we assume that there will be • no operational development

  26. what is MD, what is commissioning? 1. example: 90 m optics – feasibility shown in MD; commissioning for physics run done in physics time 2. example: high pile up – first test and feasibility in MD; data taking in physics time flexibility from everybody helped to accomplish major goals

  27. now:what is the preliminary view on most important topics?

  28. most important – preparing for 6.5 TeV • BI with potential hardware improvement • BPM stability for b*=0.55 m & nominal collimation • resolve BSRT systematics at 4 TeV in view of 6.5 TeV • RF • - klystron power issues, voltage modulation for transient b.l. • - transverse damper ultimate performance • OP • - feedback stabilization of orbit in squeeze • Collimation • - settings with nominal 1-s retraction, impedance • Quench limits • - relevant BLM thresholds at different energies • Heating • - understand HOM, longitudinal spectrum • Injection • - fast & accurate steering of transfer line

  29. most important – preparing for 6.5 TeV • 50 ns or 25 ns? • - high pile up limit • - bunch intensity & emittance growth limits • - electron cloud • - crossing angle & LR beam-beam separation • High beta optics • - limits with present hardware most important – new hardware • Nonlinear dynamics limits • - required specification for 11-T dipoles • - required specification for crab cavities

  30. outlook • the lists & thoughts presented here are meant as a basis for discussion • iteration in January • final 2012 MD priorities will be summarized in Chamonix for approval • any feedback is welcome - please send comments to Giulia, Ralph and/or Frank!

  31. MD Priorities 2012 together we will straighten them out

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