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Published September 23, 1994 | Published
Book Section - Chapter Open

Two-Dimensional Interdigitated Pixel Detector for Energetic Particle Spectrometers


This paper describes a type of cosmic ray detector suitable for the construction of a small, low power space-based instrument to detect the energy and isotope of energetic nuclei, such as those produced by solar flares. The detector is similar to previous types of silicon PIN detectors where the fully depleted body of the wafer comprises the intrinsic region of the PIN structure. The novel aspect of this detector is that the one surface is divided into a 2D array of pixels, and that the collected holes are divided between a row and a column collector in each pixel, yielding both dimensions of position information from this side of the detector. In a conventional PIN detector, both sides are divided into stripes, and each side provides 1D information. A single large area collector on the opposite side of this new detector is used to determine the energy of the incident nucleus. This scheme requires only a single precision pulse-height amplifier connected to the broad area contract, rather than one for each strip, as in the conventional scheme, resulting in a significant reduction in the mass, power and complexity of the readout electronics. The design, fabrication, and operation of such a detector is discussed. Initial particle tests show a prototype to be functional. The projected power saved by using such as detector is presented.

Additional Information

Copyright © 1994 SPIE. The research described in this paper was conducted by the Space Radiation Laboratory of the California Institute of Technology and by the Center of Space Microelectronics Technology, Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (NASA), Office of Advanced Concepts and Technology. This work was supported by the NASA under grant NAGW-2806. Reference herein to any specific commercial product, process or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply endorsement by the United States Government or the Jet Propulsion Laboratory, California Institute of Technology. The authors gratefully acknowledge helpful discussions with Steve Holland of the Lawrence-Berkeley Laboratory.

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