Commissioning and running of sPHENIX

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

News from today’s 9 o’clock meeting (5/13)

- one turn of blue beam achieved last night, but not all goals were achieved, so we are two days behind now

- cryo issue at 56 MHz cavity, needs access to fix, two days of work needed

  - small amounts of beam still possible (56 bunches with 1*10^9) during that time whenever cryo access is interrupted

- PS wants rings to be closed so they can work on ramps ==> conflict with cryo work, need to coordinate

- pulsed power

- malfunction in blue line no. 1:  probably air; investigating

STAR:  TPC problem

- multiple issues with read-out board

- probably from cooling water leak

- need to open pole tip to fix

- about 14 h

- preparing 

- plan to do that on Tuesday

sPHENIX:  TPC problem fixed

- ready for collisions

- waiting for approval for gas and magnet

Conclusion for sPHENIX:

- beginning of commissioning with beam now expected for Friday morning +/- 2 days

- expect long period of RA on Tuesday (b/c of STAR work)

- 

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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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