Photon-Counting Monolithic Avalanche Photodiode Arrays for the Super Collider

  • A. Nadeem Ishaque
  • Donald E. Castleberry
  • Henri M. Rougeot


In fiber tracking, calorimetry, and other high energy and nuclear physics experiments, the need arises to detect an optical signal consisting of a few photons (in some cases a single photoelectron) with a detector insensitive to magnetic fields. Previous attempts to detect a single photoelectron have involved avalanche photodiodes (APDs) operated in the Geiger mode [1], the visible light photon counter [2], and a photomultiplier tube with an APD as the anode [3]. In this paper it is demonstrated that silicon APDs, biased below the breakdown voltage, can be used to detect a signal of a few photons with conventional pulse counting circuitry at room temperature. Moderate cooling, it is further argued, could make it possible to detect a single photoelectron.


Breakdown Voltage Ionization Rate Avalanche Photodiode Fiber Tracking Shaping Time 
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • A. Nadeem Ishaque
    • 1
  • Donald E. Castleberry
    • 1
  • Henri M. Rougeot
    • 1
  1. 1.General Electric Corporate Research and DevelopmentSchenectadyUSA

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