Cosmic-ray detector with interdigitated-finger pixels for two-dimensional position information from a single wafer side
This paper describes a type of cosmic ray detector for isotopic and energy detection of energetic nuclei which derives both dimensions of position information from one side of the detector. This simplifies the required readout electronics, since only one precision amplifier connected to the other side is required for an accurate detection of the energy loss. Two dimensional readout is enabled by the use of pixels consisting of closely spaced interdigitated electrodes alternately connected to row and column lines. Spreading of the charge produced by the cosmic ray results in the charge being collected by more than one electrode producing both a row and column signal on one side of the detector. The design, fabrication, and characterization of the interdigitated-pixel detector is discussed.
Additional Information© 1993 SPIE. The research described in this paper was conducted by the Jet Propulsion Laboratory, California Institute of Technology and by the Space Radiation Laboratory of the California Institute of Technology under a contract with the National Aeronautics and Space Administration. The authors gratefully acknowledge helpful discussions with Steve Holland of the Lawrence-Berkeley Laboratory and Debra Hebert of the ERL Microlabs of the University of California at Berkeley. The authors also wish to thank Chuck Manning, Suzanne Martin, and Jim Wishard of the Jet Propulsion Laboratory MicroDevices Laboratory for technical assistance.
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