Equipment Tests for DHC Tower

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Presentation transcript:

Equipment Tests for DHC Tower Kurt Francis - Northern Illinois University Update - 08/27/2003

Introduction Received loaner QDC (similar to original but 16 vs 32 channels) Did data runs with two of six new PMTs First assesment showed that light yield was ~1/2 what we had before Then we received repaired QDC and had similar results We were worried that the 2 times difference in light yield was too much

Current Status Collected data with one new PMT with both upper and lower sets of repaired QDC channels Used ROOT command line programming to: remove pedestal find cutoff between crosstalk curve and MIP curve use root functions to find mean of crosstalk peak and MIP peak use this data to calculate Light Yield Used the same ROOT processing on both and old data set and the data collected with the repaired board...

Conclusions about PMT L.Y. Definitely a difference between the before and after light yield plots but not as bad as 2 times The difference in average light yield (11.0 compared to 7.9) is within a reasonable range for two different PMT

Tower Data First test of tower used 4 layers of cells connected to 2 PMTs. PMT HV set at 900V Triggering was 2 way coincidence using two Thorn-EMI PMTs connected to paddle scintillators --> High rate of events but most events 99% were pedestal Need to switch to 3 way coincidence using dynode 12 from PMT

Next Steps Keep improving ROOT based analysis software Clean up triggering and switch to 3 way trigger using 2 external PMTs and dynode 12 from one of the multichannel PMTs