LHC progress with beam & plans

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 1028 cm-2s-1 LHC planning

3. LHC planning

4. LBDS – machine protection checks LHC planning

5. beta beating in ramp LHC planning

6. beating in ramp • 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 LHC planning

7. BPM versus intensity • Orbit shift when going from low to high bunch intensity gain: • 9 109  9 1010 systematic shift of ca. 300 mm; shift seems to be mainly systematic into one direction; gain switch @ 2 1010

8. Collimation • Summary of Collimation studies (1011 / 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

9. Collimators in ramp Stefano Redaelii LHC planning

10. ADT commissioning with beam LHC planning

11. ADT LHC planning

12. ADT – to do list LHC planning

13. Immediate goals 1/3 : 8e10 per beam (S2) Most preparation done • 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

14. Immediate goals 2/3: OPs Half day review next Tuesday • 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

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

16. 450 GeV – prep for higher intensity LHC planning

17. Ramp LHC planning

18. Squeeze LHC planning

19. 3.5 TeV prerequisites for higher intensity LHC planning

20. Schedule S2 LHC planning

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