From: Flemming Videbaek (videbaek@rcf.rhic.bnl.gov)
Date: Wed Sep 03 2003 - 08:44:24 EDT
A comment to the issue Jens Ivar brought up on the TOF cal. a) The way the raw data PRESENTLY are fill should guarentee that the "number of slats" == "number of hits" not only for Tof systesm but also BB and others etectors with fixe #channels. We have in the last two runs used some hardware channele eg from BB to other purpose, usually this would plainly result in having both ac and tdc == 0 for those channels, and the calibration software would just map these as being bad. So it is in fact a bit surprising that you at all got an error unless the detectorparams.txt no of tubes does not match the number of actual 'slats' in the raw data. Could you give a bit more info. B) The assumption above has been made other places see eg also BrBbDeltaTdcCalModule.cxx; This ought to be fixed, since these are good reasons not to create dataObjects for non-existing tubes/slats etc. A comment on the ZDC to Claus. Great you are looking at this. Did you get the spreadsheet from Michael with the analysis of the cosmic gain? The comment is really that the way ZDC's were mapped at different runs is a bit of a mess since the data mapped to the fastbus and to camac from earlier runs has different sources. I am not at the lab this week, so I do not have the information handy. The caution is really just be careful that changes that makes the d-Au and pp work does not mess up coe for the earlier Au runs (1 and 2). regards -- Flemming Videbaek Brookhaven National Laboratory Physics Department tlf 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov
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