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Equipment Tests for DHC Tower

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

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Equipment Tests for DHC Tower

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

  2. 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

  3. 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...

  4. 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

  5. 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

  6. 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

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