User name M. Rvachev
Log entry time 17:26:45 on March18,2000
Entry number 36459
keyword=Some info on VDC problemsIt seems that the problem with hadron v1 VDC plane appeared during maintanance
period, so affected is first part of kinematics 15. Current version of what happened:
in TDC card that serviced 96 wires an address bit got corrupted, which resulted
in shift of addresses of two groups of 16 wires by 16. So total number of currupted
wires is at least 64. Moreover we observed a dip of ~16 wires in the middle of the
plane (see histogram below for run 2806). Bogdan attributes this dip to time
misalighnment of a group of 16 wires and a cut that espace does on timing. However
if this explanation is not correct and we had a hardware problem in the middle of the
plane, then we lost ~20 hours data.
FIGURE 1
