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[videbaek <videbaek AT bnl.gov>]

Hi Yuri,

What you are monitoring is the TPC currents, not the voltages; This 
explains what you see, but in many, most is not all,  case it should not 
affect you analyzes. What happens at least in two runs, and this does 
indeed happen many times every run period. On system goes dead (could be 
TPC could be some other system, so no events are recorded (gating grid 
stays closed as no triggers sho up thus the current drops to 0 , NOT the 
voltage.
So once the system is dead the operator stops the runs after a short 
time (up to many minutes depending on their alertness.

So you are correct if I understand you correctly, you cannot use the 
average current throughout the start-stop time. The average would also 
be disturb by 100% dead through the runs e.g. during auto recoveries of 
TPC or TOF e.g.


Flemming






--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596