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The Silicon Tracker Readout Electronics of the Gamma-ray Large Area Space Telescope Marcus Ziegler

Gamma-ray Large Area Space Telescope. The Silicon Tracker Readout Electronics of the Gamma-ray Large Area Space Telescope Marcus Ziegler Santa Cruz Institute for Particle Physics University of California at Santa Cruz GLAST LAT Collaboration ziegler@scipp.ucsc.edu. . e –. e +.

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The Silicon Tracker Readout Electronics of the Gamma-ray Large Area Space Telescope Marcus Ziegler

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

  2. e– e+ GLAST LAT Tracker Overview Si Tracker 880 000 chanels 160 Watts • The LAT Tracker is devided into: • 16 Tracker Towers • each stack is composed out of 19 trays • Tray: • Carbon-composite panel with Si-strip detectors on both sides. • On the bottom side is a tungsten foil bonded

  3. Tower

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

  5. Detail of an EM MCM, at One End Nanonics Connector (will be Omnetics) GTRC ASIC Grounding screw hole Polyswitch 90° radius GTFE ASIC Pitch-adapter flex circuit Shown prior to wire-bond encapsulation and conformal coating.

  6. Readout Electronics

  7. Machined corner radius with bonded flex circuit. Detector Composite Panel Readout IC High thermal conductivity transfer adhesive PWB attached by screws Electronics Packaging • Dead area within the tracking volume must be minimized. • Hence the 16 modules must be closely packed. • This is achieved by attaching the electronics to the tray sides. • Flex circuits with 1552 fine traces are bonded to a radius on the PWB to interconnect the detectors and electronics. Detector signals, 100 V bias, and ground reference are brought around the 90° corner by a Kapton circuit bonded to the PWB.

  8. Bias Circuits SSDs Panel Tungsten MCM Mechanical Structure • Carbon-fiber composite used for radiation transparency, stiffness, thermal stability, and thermal conductivity. • Honeycomb panels made from machined carbon-carbon closeouts, graphite/cyanate-ester face sheets, and aluminum cores. • High-performance graphite/cyanate-ester sidewalls carry the electronics heat to the base of the module. • Titanium flexure mounts allow differential thermal expansion between the aluminum base grid and the carbon-fiber tracker. Bottom Tray Flexure Mounts Thermal Gasket

  9. Conclusions • Solid-state detector technology and modern electronics enable us to improve on the previous generation gamma-ray telescope by well more than an order of magnitude in sensitivity. • The LAT tracker design uses well-established detector technology but has solved a number of engineering problems related to putting a 900,000 channel silicon-strip system in orbit: • Highly reliable SSD design for mass production • Very low power fault-tolerant electronics readout • Rigid, low-mass structure with passive cooling • Compact electronics packaging with minimal dead area • We have validated the design concepts with several prototype cycles and are now approaching the manufacturing stage. • We’re looking forward to a 2007 launch and a decade of exciting GLAST science!

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