Overview - LHC commissioning strategy with beam 2011

comm 2011

Outline

  • Re-establish circulating beams and initial 450 GeV commissioning (Phase A.3 – fast track)
    • Key instrumentation and measurements: tune, chromaticity, coupling, optics, orbit acquisition and correction
    • RF adjustment
    • LDBS checks
    • Check essential machine protection for 450 GeV+
      • LBDS, BLMs, BIS, collimators, experiments
  • Validate Machine Protection appropriate for low intensity to 3.5 TeV:
    • FMCMs, PIC, Collimators, TCDQ, BLMs, BPM interlocks, SMPs, RF frequency, LBDS
  • Ramp to 3.5 TeVwith safe beam
    • appropriate machine protection established; collimators at intermediate; LDBS > 450 GeV, dumps in ramp; snapback, FiDeL predictions, etc.; RF; Q, Q’, orbit measurements; bring 2 beam to 3.5TeV - separation bumps on
  • 3.5 TeV measurement program: optics, tune, Q', beating, dispersion, aperture checks
  • Commission squeeze and collision beam process
  • Finish machine protection validation
  • Injection setup for mult-bunch injection
  • Collimator setup at injection, through ramp and squeeze. Loss maps
  • Beam dump setup and validation

Maximum energy and beta*s at each of the experiments to be established.

Time estimate

With optimistic machine availability.

Phase
Time [days]
Bunches
Intensity
 Main tasks
Circulating beam
1
1
5 e9
 essential checks, orbit, RF etc.
450 GeV recommissioning
2
1
5 e9

tune, Q’, C-, orbit, collimators, LBDS, instrumentation

450 GeV essential optics checks
0.5
1
5 e9

beating, energy matching
450 GeV - two beams
0.5
1
5 e9

bumps as standard set-up, adjust TDI etc
Ramp to 3.5 TeV
1
1
5 e9
 commission essential machine protection, experiments' dipoles on in ramp, orbit and tune feedback
3.5 TeV measurements
1
1
SBL
 standard measurements - beating, coupling...
Commission squeeze
2
2
SBL
 orbit and tune feedback, collimation, aperture, bumps, machine protection checks, beam dumps etc.

Full collimator set-up at 450 GeV, flat-top, squeezed and colliding
7
2
nominal
 Including full validation - loss maps, asynchronous dumps
Machine protection
5
safe beam
Beam dump set-up and validation
4 - 5
2
nominal
 including async dumps. 12 - 14 shifts requested with beam
Injection set-up
5
various
Looking towards 75 ns, can be staged