1. LHC progress with beam & plans

2. Of note since last time Transverse damper Beta beating in the ramp Collimation set-up at 450 GeV & validation LBDS – systematic checks for higher intensity BPMs – variation with intensity RF, full buckets and phase control And some physics – 2 x 10 28 cm -2 s -1 LHC planning 11-05-10

3. LHC planning 11-05-10

4. LBDS – machine protection checks LHC planning 11-05-10

5. beta beating in ramp LHC planning 11-05-10

6. beating in ramp LHC planning 11-05-10 Largest -beating at 1.1 TeV IR7 seems to be the dominant source P. Hagen just finished the MQW measurement campaign At 450 GeV P. Hagen’s data agree with the beating corrections Remove correction – go with updated calibration curves – test today

7. BPM versus intensity Orbit shift when going from low to high bunch intensity gain:  9 10 9  9 10 10  systematic shift of ca. 300  m; shift seems to be mainly systematic into one direction; gain switch @ 2 10 10 7

8. Collimation Summary of Collimation studies (10 11 / bunch):  collimation settings at 450 GeV for nominal bunch intensity established (improved beam-based calibration method  higher accuracy with increased intensity and correction for halo cuts during setup). We provoked stored beam losses in H, V and off-momentum (positive and negative) for beam 1 and beam 2. Separate loss maps recorded. Results looked fully OK in preliminary visual inspection, but further detailed analysis required. Much lower (invisible) losses in tertiary collimators. Like expected in simulations. All collimators set back to previous settings in the end (low bunch intensity). LHC planning 11-05-10

9. Collimators in ramp LHC planning 11-05-10 Stefano Redaelii

10. ADT commissioning with beam LHC planning 11-05-10

11. ADT LHC planning 11-05-10

12. ADT – to do list LHC planning 11-05-10

13. Immediate goals 1/3 : 8e10 per beam (S2) Intensity step 2 to do:  BPM intensity calibration  Collimation & OFB in ramp  LBDS checks – mostly done check on the RF LBDS synchronisation for B1/B2 Make the 'power off' test of the LBDS with beam circulating  Machine protection BIS test – MZ the SIS interlock on the beam position at the TCDQ LHC planning 11-05-10 Most preparation done

14. Immediate goals 2/3: OPs Nail down the operational sequence & issues:  Injection, ramp, squeeze,  Feedbacks etc., references  Sequences  Trims, settings  Alarms  Orbit correction, reference orbit, variations with intensity  SPS cycle changes LHC planning 11-05-10 Half day review next Tuesday

15. Immediate goal 3/3: 2 x 1e11 (S3) Dodge the intermediate intensity issue Commissioning 1e11 through operational cycle  single bunch per beam up the ramp collimators OFB RF  flat-top collimation, separation on check beating  squeeze to 5 m separation beating  collisions LHC planning 11-05-10

16. 450 GeV – prep for higher intensity LHC planning 11-05-10 shiftspriority COLCollimator set-up & loss maps2 minS2OK COLMeasure n111 ABP & coFinish aperture measurements off-mom11 RFTransverse damper2+2wip RF & coAbort gap cleaning22wip LBDS & BISNo beam – BP checks TCDQ tracking 1S2 LBDSP6 aperture1S2OK ABTInjection studies (checks for B2 emittance, TDI thresholds for over-injection, TCDI protection validation checks, essential injection region aperture checks, MKI waveform) 12 MPSSetup beam flag-1OK LBDS/MPSFull set of checks at 450 GeV including mains off2S2OK MPSRF frequency interlock-S2OK COL/LDBSCalibration of BLMs at TCTs11

17. Ramp LHC planning 11-05-10 shiftspriority Snapback update, Q’ measurement & correction Parasitic2Not critical for lower intensities Beta beating measurementsditto1S2 – checks todayOK Collimators and protection devices in ramp 21S2 - today Synchronization tests of TCDQ positions and interlocks with other collimators during ramp and squeeze S2 - today Beam dumps to qualify MSD update 21OK Orbit feedback & feed- forward 12S2

18. Squeeze LHC planning 11-05-10 Priority Separation on for S31 Golden orbit squeezed, separated1 Golden orbit squeezed, colliding1 Drive tertiary collimators with functions (or pre- load) not need for 5 m OK OP sequence – into sequencer… in one go1OK Orbit feedback Tune feedbackif requiredOK

19. 3.5 TeV prerequisites for higher intensity LHC planning 11-05-10 shiftspriority COLcollimation setup at 3.5 TeV31 BLMBLM thresholds for losses in SC area21 LBDSLBDS MPS checks (3.5 TeV) Calibration of beam loss at TCDQ, response of direct BLM 11 LBDSSetup of TCDQ/TCSG to measured beam sizes at 3.5 TeV (through squeeze - interpolated betas) done1 LBDSTest of asynchronous dump protection at 3.5 TeV (through squeeze, needs several fills if optics varies) 41 SISSIS TCDQ position interlock checks0.51

20. Schedule LHC planning 11-05-10 S2

21. Conclusions Stable beams at around the safe beam limit now routine Good progress in ticking off required commissioning steps for higher intensity  MPS, LBDS, Collimation Should be ready this weekend for first step up  8 – 12 e10 total, 4-6 bunches of 2 e10 1 e11 good at 450 GeV, will now start pushing into ramp and finish required commissioning at 3.5 TeV with higher single beam intensity  Pull back to beta* = 5 m. LHC planning 11-05-10