Anode High Voltage Distribution
In October, 1999, after the end of the summer engineering run,
Blair Stringfellow measured the TPC anode high voltages under
a dummy load, looking for variations in the setpoint voltage.
In general the voltages are within the Lecroy specs. The mean value
of the voltages is slightly off, but that is because the voltages were
calculated using the ratio of the resistor values in the load box, as
the voltage spread was the main thing of interest.
The inner sector HV subsections are labeled #1 - #4 (#1 is nearest the beam);
outer sector HV subsections are labeled #5 - #8.
- For the inner sectors (96 HV channels) the sigma was 0.5 volts.
One channel (Sector 7, #4)is off by 10 volts, but it was put in recently
and was not in during the engineering run.
- For the outer sectors (96 HV channels) the sigma was 0.54 volts,
and 3 channels (Sector 17, #7; Sector 18, #7,#8) were off by about 3 volts.
Plots of the distribution
are also available.
Page created by Iwona Sakrejda,
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Last modified on June 29, 2000