Definition of a Twelve-Point Polygonal SAA Boundaryfor the GLAST Mission Page: 4 of 23
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hull area is increased by -20%, the loss of total observational area is < 5%. These twelve
coordinates defining the SAA flux region are ready for implementation by the GLAST
The universe contains a myriad of exotic entities, some able to produce enormous
amounts of energy. Gamma-ray radiation, generated by such objects as black holes,
neutron stars, and relativistic hot gas, is the most energetic form of radiation. The
Gamma-ray Large Area Space Telescope (GLAST) seeks to unravel mysteries behind
such extraordinary phenomena in order to better understand the high-energy world and
how it affects the behavior of the universe. Set to launch in early 2008, the GLAST
satellite is highly sensitive to gamma rays within an approximate energy range of
100MeV-300GeV . Being 30-100 times more sensitive than any previous gamma ray
telescope, GLAST aims at locating gamma ray sources throughout the universe and
studying their properties .
A key component of GLAST is its outer detector layer, called the Anti-
Coincidence Detector (ACD), whose purpose is to efficiently identify and disregard
incident charged particles. In order to maximize its veto capabilities, the ACD consists of
89 plastic scintillator tiles, for which signals produced in them are read out by
Photomultiplier Tubes (PMTs) . When the scintillators encounter an influx of charged
particles, photons are produced which pass into the PMT. Upon entering, the photons
encounter the photocathode, causing electrons to be ejected via the photoelectric effect.
These electrons proceed towards an increasingly positive series of dynodes, generating a
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Djomehri, Sabra I. & /UC, Santa Cruz /SLAC. Definition of a Twelve-Point Polygonal SAA Boundaryfor the GLAST Mission, report, August 29, 2007; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc889666/m1/4/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.