HiRes experiment used a Roving Xenon Flasher (RXF) as a standard light source for in situ calibration of photo multiplier tubes (PMT) in air-shower detectors. I developed a procedure to measure the absolute light output of the RXF using a hybrid photo diode (HPD). The absolute efficiency of the HPD was first calibrated with respect to a NIST calibrated silicon sensor by a photon counting method. Which was then used to measure the light output of the RXF.
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HPD calibration system (Final version at the University of Utah) |
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Sample/hold and gate generator module I built for the HPD/RXF calibration. |
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I designed and built all hardware and developed the experimental
and the analysis procedure to calibrate the HPD and the RXF. The HPD
was calibrated to within a 5% accuracy and the RXF better than 7%. More
details about the set up and the calibration procedure can be found in
following links:
