I will like to comment on the statements here (without the benifit of access to any plots nor a logbook) -- The ZDC TDC delay cables were moved around to equilize the timing between B and Y (This is documented in the ZDC log book in the counting house) for the sum and channel 0. -- I recall from phone conversations Sunday morning that the time shift was seen in the BB not the ZDC Is this correct?? hope this helps Flemming ------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax: 631-344-1334 videbaek@bnl.gov ----- Original Message ----- From: jhlee (J. H. Lee) To: brahms-l@bnl.gov Sent: Monday, July 31, 2000 8:15 PM Subject: ZCAL timing Folks, The ZDC timing "mystery" we've been wondering about (see http://www.rhic.bnl.gov/brahms/WWW/private/list_hyper/brahms-l/0129.html) is probably due to some recent changes made in the ZDC monitoring program (BrMonitorZDC.cxx), I assume by ZDC people. The 5-8 nsec offset on the ZDC time differences we are seeing now is because the current ZDC monitoring program plots the time difference between two 1st ZDC channels. We already know that the time difference of the 1st channel is NOT centered at or near 0 by some reason. (please see http://pii3.brahms.bnl.gov/~operator/pictures/zdc_time_diff.ps) The old version of the ZDC monitoring program used summed TDC values for plotting time differences. Anyway, the ZDC time difference look much like before if I use two TDC Sums instead of two 1st channels. (Please see http://pii3.brahms.bnl.gov/~operator/pictures/zdc_1941.ps). JH
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