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Title: Measurement of the hybrid photodiode response - Fiber optic window

Technical Report ·
DOI:https://doi.org/10.2172/2878· OSTI ID:2878
 [1];  [1];  [1];  [2]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Univ. of Rochester, NY (United States)

The hybrid photodiode (HPD) will be used for the CMS HCAL readout. A fiber-optic front window is used to reduce optical cross-talk between the pixels of the multi-pixel HPD's. A mismatch of numerical aperture between optical fibers carrying light to the HPD window and the fibers composing the fiber-optic front window of the HPD could lead to light loss. The light loss would appear as a reduced effective quantum efficiency of the device. The goal of this set of measurements was to see if there was in fact a reduction in the effective quantum efficiency of the HPD's.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
AC02-76CH03000
OSTI ID:
2878
Report Number(s):
FERMILAB-TM-2064; ON: DE00002878
Country of Publication:
United States
Language:
English

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