450 GeV - preliminary commissioning

Completed 2009 and repeated start of March 2010

Last update 3/3/2010

Aim: Get the machine in a good enough shape that we can sensibly start performing detailed adjustment and measurements and checks. No point in details if we're not sure the basic optics is not correct and the beam instrumentation isn't working properly. Prerequisite for safely increasing the number of bunches plus intensity.

Prerequisites: reasonable lifetime, circulating pilot, well adjusted tunes, chromaticity, orbit and coupling

Exit:

Additional aims

  1. Test the control and correction  (corrector polarity, cabling, control system, software, procedures, ).
  2. Commission beam loss monitors - acquisition, display etc., connection to BIC, threshold checks with beam
  3. Commission beam dump - phase 1
  4. Commission beam interlock system with beam - phase 1. BIC to dump with beam. Check.
  5. Commission transverse diagnostics: BPMs - capture mode, tune PLL, RF frequency modulation
  6. Measurement program with pilots: polarities, aperture (first pass), beating
  7. Linear optics checks: check trajectory versus kick, phase advance, BPM and corrector polarity.
  8. Adjust tunes, orbit, chromaticity, coupling.
  9. Commission BCTs: lifetime measurement
Beam Task Who How long   Status
B2 RF commissioning with circulating pilot RF 8 hours    
B1 RF commissioning with circulating pilot RF 8 hours    
B2 BBQ systems FFT1 (continous/logging and FFT2 (on-demand/system for fooling around with various settings)       Fully commissioned
B1 BBQ systems FFT1 (continous/logging and FFT2 (on-demand/system for fooling around with various settings)        
           
B2

Lifetime optimisation - tune, chromaticity, orbit

Measure coupling

Check Q and Q' coupling trims

Basic optics checks

OP 2*8 hours  
  • Lifetime looks OK but still issue with "the hump" particularly in vertical plane - also evidenced by blow-up
  • Chromaticity to measure & check properly
  • Trims to be checked properly
B1

Lifetime optimisation - tune, chromaticity, orbit

Measure coupling

Check Q and Q' coupling trims

Basic optics checks

OP 2*8 hours  
  • clearly better, in general, to beam 2
           
B1/B2 Reproducibility following cycling OP 4*2 hours (at appropriate times)   Excellent with pre-cycling
           
B2 Fast BCT  BI/OP 4 hours   OK
B1 Fast BCT  BI/OP 4 hours   OK
B2 DC BCT & lifetime       OK
B1 DC BCT & lifetime       OK
B2 Commission BPM capture       OK
B1 Commission BPM capture       OK
B1/B2 Beam dump with circulating beam - phase 1 LBDS team 3*8 hours   - RF <-> kicker timing (bunch 1 in bucket 1).
- Abort gap keeper.
- aperture of extracted beam.
- sweep form. - aperture of circulating beam.
- full LBDS BI checks.
- tidy up of arming sequences (I&D, C&D, programmed dump, ...).
- bringing up XPOC for BI.
           
B2 Initial collimator commissioning Coll team 8 hours   first pass - looks good
B1 Initial collimator commissioning Coll team 8 hours   first pass
           
           
 B1/B2 First look at GOFB RS & Gauls 2*8 hours   OK - issue with rouge RT packet
           
           

1. Initial Tuning of 450 GeV Machine

2. Systematic Pickup and Corrector Polarity Check and Aperture Scan

4. Revisit the Injection Settings

5. Initial Commissioning of the Beam Dump.

& re-visit

6. Other Measurements/ Corrections

 

 

 

  System State Action
Equipment Injection Kickers and Septa On-axis injection optimised Operational
  RMS Off  
  Power Converters All circuits available, cycling to predefined energy possible Check all tolerances, monitoring
  RF Capture  
  RF  - TFB   Not needed
  RF - LFB   Not needed
       
Machine protection TCLI   Not needed at this stage
  TCDQ   Coarse positioning
  TDI   Coarse positioning
  Collimators   Coarse positioning
  Beam Dump   Commission at 450 GeV
  Beam Interlock Controller    
       
Controls, in particular      
       
  Orbit Feedback   Data acquisition - first trials - not needed operationally
       
       
Instrumentation Beam Loss Monitors   See machine protection
  Beam Current Transformers   Commission
  Beam Position Monitors   Commission
  Wire Scanners   Low priority
  Synchrotron Light Monitor   Low priority
  Screens   Not with circulating beam - check interlocks
  Tune measurement   Commission
  Chromaticity measurement   With Dp/p
  Abort gap monitor   Not needed
  Radiation monitors   Check
  Residual gas monitors   Low priority
       
Technical Infrastructure Beam Vacuum
Cooling and Ventilation
Cryogenics Plant
Cryostat Instrumentation
Electrical Network
Insulation Vacuum
Powering Interlock
QRL Instrumentation
QRL Vacuum
Quench Protection
Radiation Monitors
Soft Interlocks
   Taken as given. Commissioning particulars which relate to beam.