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PMT Calibration

Scint.+PMT&. Diamond (+ PA). gate. signal. ADC. PMT Calibration. There was a beamtest at CERN to evaluate linearity of response of diamond sensors In the beamtest the scintillator detector with a PMT was used as a reference The beam varied in intensity by about 600x

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PMT Calibration

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  1. Scint.+PMT& Diamond (+ PA) gate signal ADC PMT Calibration • There was a beamtest at CERN to evaluate linearity of response of diamond sensors • In the beamtest the scintillator detector with a PMT was used as a reference • The beam varied in • intensity by about 600x • which is greater than • the dynamic range • of the PMT

  2. PMT Calibration • We have to change supply voltage of the PMT to accommodate this dynamic range. The PMT also showed some saturation at high signal levels • To evaluate the linearity of the diamond sensor we need now to calibrate PMT over the whole dynamic range of intensities • To do so, we have used LED illumination PMT LED

  3. PMT Calibration • The intensity of light is assumed to be proportional to the 1/r2 • Where r is the distance between LED and PMT yr2 y0r02

  4. PMT Calibration • The saturation effect shows • at signal level of about • 600 ADC channels • Also, at small distances • we see some effects due • to geometry, because LED • is not a point source

  5. PMT Calibration • To distinguish between this effects we have made the same measurements with different LED intensity • The saturation effect is also illustrated by varying • the LED current

  6. PMT Calibration • Measurements for different PMT HV 610 V 730 V

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