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KLMTestBench / KLMTestBenchStatus

Tracking the Status of the KLM Test Bench at Hawaii
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Noisy pedestal distribution on ASIC 0 channel 0 #11

Open cketter opened 6 years ago

cketter commented 6 years ago

After setting up scripts to plot pedestal distributions by channel, I discovered that channel 0 is much noisier than other channels on ASIC 0. See peddistOneASIC.pdf. pedDistOneASIC.pdf

I moved the preamplifier from channel 0 to channel 1 on the preamp carrier card and found that the problem moved with the sensor/preamp from ch0 to ch1. See pedDistOneASICAfterSwapWCh1.pdf pedDistOneASICAfterSwapWCh1.pdf

The last thing I tried is to shorten the twisted wire leads between the MPPC and the preamp. This was tried because channel 0 had longer leads than channel 14 and perhaps was behaving as an antenna. This did not improve the issue. See pedDistOneASICAfterTrimLeads.pdf. pedDistOneASICAfterTrimLeads.pdf

cketter commented 6 years ago

It might be helpful to replace the preamplifier. If this does not fix it then we'll have to disassemble the tube and inspect and replace if necessary the MPPC.