The STAR experiment

Present: Hal, Anselm, Bernd,Gerard,Ramiro,Will, Jan, Dave U., and Steve G.

 Milestones for FGT comissioning are :  

1. ***DONE***  demonstarted 90% of channels work before collossions (pedestals are healthy)
2. ***DONE***  FGT hold 3.6kV w/ ArCo2 gass
3. demonstarted 90% of channels still work when beam circulates
4. timing is set
5. mapping in offline DB is correct
6. set workig point for pp500 

Minutes:

•  overview of commissioning plan, revision follows (draft schedule in attachment, obsolete), main conclusions:
  • significant # of tasks can and should be accomplished before the first collisions - see green section
    • analysis of ped+stat of one taken already run should proceed now
  • we do not have schedule with dates & names, I'll not give up on this
  • there are 4 people who will be allowed to operate FGT HV are: Benrd,Gerrit,Ross,Ramiro
  • handling of FGT operation in to STAR crew is a very distant idea, the plan is this 4 people will support fgt operation on site as long as it is needed 
  • finding the collision signal in FGT data is perceived as very difficult (shown in red)
    • it is safer to require the EHT trigger (plan A), but also try to see FGT signal with minB trigger during EMC timing scan (very optimistic scenario)
    • FGT deadtime in the early weeks is ~700 us, e.g. 7% dead @ 100 Hz.
    •  may require lower EHT thres and turn of HV for 3/4 of ETOW - need dedictaed trig config & EMC settings
    • deveopement of not existing code fitting time dependence of individual pulses has  been elevated to the top
    • in parallel developement of nonexisting code fitting integrals will be pursued
  • verification of mapping in DB will have 3 phases: quadrant, APV, and strip-level
  • tuning of peds in APV will be done twice: ASAP, and after timing is adjusted
  • not decided what FGT gas pressuer & HV will be set for study of the best working point (days-long data sets in pp200)
    • analysis criteria were discussed: efficiency vs. HV; cluster size; efficiency vs. saturation of cluster energy; MIP signal to pedestal width;
    • with disconnect to avaliable software - there is no code do generate any of those observables nor people to schedule to work on it
  • identified need for software to evaluate signal/noise , needed to tune APV settings
• the discussion about use of existing vs. developing new code was endless.  People remained faithful to their respective views. In my opinin the comissioning task #16 - enableing ZS for pp500 - requires Willie to finish up the code he started.  Many side benefits justify Willie does it now, not  in a month. 
• questions from Jan:
  •  access dates  - Bernd will sent a note
  • will FEE be on 24/7 : yes, said Gerard
  • how do we deal with correlated noise : Gerard suspects it is not a big issue, we have ped file taken w/ STAR DAQ and a maker based software to compute sth. Limitted (to 1) possible manopwer. Analysis downgraded in priority, after code for items up to 13 is in hand.
  • when do we switch to ZS mode? G: at the end of pp200.
  • will we ever use  wave form readout mode? G: we do it already. 
• NOT discuss status of FGT readout based on Willie's plots http://drupal.star.bnl.gov/STAR/node/23008/

 meet at BNL at 1-189

meet at LBNL ??

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Eastern Standard Time (-0500)
Start 2012-01-10  12:00
End   2012-01-10  18:00

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