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The GLAST Silicon Tracker Marcus Ziegler Santa Cruz Institute for Particle Physics

Gamma-ray Large Area Space Telescope. The GLAST Silicon Tracker Marcus Ziegler Santa Cruz Institute for Particle Physics University of California at Santa Cruz GLAST LAT Collaboration ziegler@scipp.ucsc.edu. . ACD Veto Counters Segmented scintillator tiles. e –. e +.

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The GLAST Silicon Tracker Marcus Ziegler Santa Cruz Institute for Particle Physics

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  1. Gamma-ray Large Area Space Telescope The GLAST Silicon Tracker Marcus Ziegler Santa Cruz Institute for Particle Physics University of California at Santa Cruz GLAST LAT Collaboration ziegler@scipp.ucsc.edu

  2. ACD Veto Counters Segmented scintillator tiles e– e+ GLAST LAT Overview Si Tracker 8.8105 channels 155 Watts CsI Calorimeter 8.4 radiation lengths 8 × 12 bars 3000 kg, 650 W (allocation) 1.8 m  1.8 m  1.0 m Effective area ~1 m2

  3. Tested SSDs procured from Hamamatsu Photonics 4 SSDs bonded in series. 19 “trays” stack to form one of 16 Tracker modules. 10,368 2592 342 342 648 Chip-on-board readout electronics modules. Composite panels, with tungsten foils bonded to the botom face. Tracker Construction- Overview “Tray” 18 Kapton readout cables. Electronics mount on the tray edges.

  4. ~80 m2 of PIN diodes, with P implants segmented into narrow strips. Reliable, well-developed technology from particle-physics applications. Leakage current < 2.5 nA/cm2 Bad channels < 1/10,000 Full depletion < 100 V. Silicon Strip Detector 8.95 cm square Hamamatsu-Photonics SSD before cutting from the 6-inch wafer. The thickness is 400 microns, and the strip pitch is 228 microns.

  5. Readout Electronics on the Tray Silicon detector • Binary readout • Redundancy scheme • Zero suppression GTFE GTRC

  6. Readout Electronics Based on 2 ASICs developed exclusively for this project: • 64-channel amplifier-discriminator chip (GTFE); 24 per module. • Readout controller chip (GTRC); 2 per module.

  7. Pulse shape and calibration

  8. Minitower for taking cosmics data Thanks to Hiro Tajima and Eduardo do Couto e Silva

  9. Hitmap with Cosmics for three Trays

  10. Efficiency for cosmic rays

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