Commissioning and running of sPHENIX

[Stefan Bathe <stefan.bathe AT baruch.cuny.edu>]

RHIC
- rebucketing is done
- fixed collimation issue (yellow still not as clean as blue)
- one store lost on bpm permit
  - false alarm, controlled beam dump, no risk for sPHENIX
- limited to 10^9 intensity, investigating
STAR
- beautifully centered
- next 1 mead
- used data for calibration
- probably ready to go to physics over weekend
debunched beam until stochastic cooling is in effect
sPHENIX
- approval to operate granted yesterday
- access underway for:
  - starting magnet cryo
  - starting nitrogen flow
  - starting operating gas for TPOT and TPC
  - instrumenting North tunnel background scintillators
- MBD saw lots of junk from north in first store
- difficulty timing in MBD since RHIC tune changed and coarse delay in GL1 
(called L1 delay) was not implemented yet
- miscommunication between shift crews and experts:  experts didn’t get 
called for overnight store
- plan for tonight:  continue MBD trigger commissioning
RHIC plan:
- run beam for experiments starting after this morning’s access through the 
weekend
- start with 56 bunches

(see Travis’s slides and my slide attached)

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Stefan Bathe
Professor of Physics
Baruch College, CUNY
and RIKEN Visiting Scientist

Baruch:                                     BNL:
17 Lexington Ave                      Bldg. 510
office 940                                  office 2-229
phone 646-660-6272                phone 631-344-8490
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