A minor clarification: I do not want run 3925. I was under the (mistaken, as it happens) impression that the ZDC calibrations that you already had were OK for the entire run. (And I will let Michael tell you where I obtained my mistaken impression) I suggested that the existing calibration be copied and inserted into the data base as run 3925, so that it could be used for all early runs. BUT PLEASE DO NOT DO THIS, as the calibrations are NOT so stable. What I think might be profitable: 1. Calibrations for runs after 5361 ( I suppose this is now done) 2. Calibrations starting at 5361 and going toward lower run numbers. 3. Energy calibrations. (note to Michael: one of the reasons we did not want to use ZDC in centrality determinations was that there was no energy calibration...so we seem to have a bit of non-optimal feedback...) Cheers, Ian > -----Original Message----- > From: owner-brahms-dev-l@bnl.gov [mailto:owner-brahms-dev-l@bnl.gov]On > Behalf Of Michael Murray > Sent: 20. juni 2002 16:07 > To: brahms-dev-l@bnl.gov > Cc: Flemming Videbaek > Subject: More ZDC calibrations done > > > Dear Brahmen, > Andrei had trouble sending this to BRAHM-dev-l > so I am sending it. > Michael > > Hello, > > I commited to the database slew corrections and z-offsets > for the runs 5361, 5362, 5367 and 5368. > > For these runs and also for runs 4640, 4713 (I will commit data > for them tomorrow) the first module in right ZDC does not nave > a signal, so I used the averaged time from modules 2 and 3. That > required a small change to the BrZdcRdoModule.cxx, which I > commited to CVS. This didn't affect much quality of the data. > Here I list the obtained offsets: > > Run# Offset Sigma > > 5361 12.36 2.55 > 5362 3.49 2.59 > 5367 0.93 2.64 > 5368 10.44 2.52 > > The 11 cm difference between adjacent runs tells that z-offset > calibration should probably be done for every run (or as often > as possible). > > As soon as I'll finish with 4640, 4713, I'll (try to) produce > calibrations for the runs about ~3925 (for Ian Bearden). > > I also attached here a (Zzdc- Ztpm1) dist-n for the run 5368. > > Andrei. > > ----------------------------------------------- > > ----- End forwarded message ----- > > > > Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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