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BOLOCAM focal plane array

BOLOCAM focal plane array. Gas discharge tube. Geiger counter Proportional counter. Geiger-Mueller: G > 10 8 Proportional: G ~ 10 4 - 10 5. For proportional counter: measure charge position along the central wire to get the charge position. GLAST (Fermi) Detectors. Large Area Telescope

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BOLOCAM focal plane array

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  1. BOLOCAM focal plane array

  2. Gas discharge tube Geiger counter Proportional counter Geiger-Mueller: G > 108 Proportional: G ~ 104 - 105 For proportional counter: measure charge position along the central wire to get the charge position.

  3. GLAST (Fermi) Detectors Large Area Telescope (20% sky coverage) GLAST Burst Monitor Twelve NaI low-energy (8 keV – 1 MeV) X-/gamma-ray detectors facing in different directions locate source within a few degrees. Two BiGeO calorimeters do much the same for high-energy (150 keV – 30 MeV) gamma rays. • Anticoincidence detector triggers on charged particles (so, not gamma-rays) • W sheets convert gammas to e+/- pairs • Silicon strip detectors track particles • Calorimeter measures particle energies

  4. First Fermi all-sky gamma ray map August 2008

  5. Swift Satellite ZnCdTe calorimeter array (32,768 elements) and readout electronics

  6. BAT coded-aperture mask 1.4 Sr field of view, 15-150 keV

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