The GLAST instrument concept is a gamma-ray pair conversion telescope that uses silicon microstrip detector technology to track the electron-positron pairs resulting from gamma-ray conversions in thin lead foils. A cesium iodide calorimeter following the tracker is used to measure the gamma-ray energy. Silicon strip technology is mature and robust, with an excellent heritage in space science and particle physics. It has many characteristics important for optimal performance of a pair conversion telescope, including high efficiency in thin detector planes, low noise, and excellent resolution and two-track separation. The large size of GLAST and high channel count in the tracker puts demands on the readout technology to operate at very low power, yet with sufficiently low noise occupancy to allow self triggering. A prototype system employing custom-designed ASIC’s has been built and tested that meets the design goal of approximately 200_W per channel power consumption with a noise occupancy of less than one hit per trigger per 10,000 channels. Detailed design of the full-scale tracker is well advanced, with non-flight prototypes built for all components, and a complete 50,000 channel engineering demonstration tower module is currently under construction and will be tested in particle beams in late 1999. The flight-instrument conceptual design is for a array of tower modules with an aperture of 2.9 m2 and an effective area of greater than 8000 cm2.
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12 April 2000
THE FIFTH COMPTON SYMPOSIUM
15-17 Sep 1999
Portsmouth, New Hampshire (USA)
Research Article|
April 12 2000
The GLAST silicon-strip tracking system Available to Purchase
Robert P. Johnson
Robert P. Johnson
Santa Cruz Institute for Particle Physics, University of California at Santa Cruz
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Robert P. Johnson
Santa Cruz Institute for Particle Physics, University of California at Santa Cruz
AIP Conf. Proc. 510, 754–758 (2000)
Citation
Robert P. Johnson; The GLAST silicon-strip tracking system. AIP Conf. Proc. 12 April 2000; 510 (1): 754–758. https://doi.org/10.1063/1.1307036
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