GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 1 GLAST Large Area Telescope: AntiCoincidence Detector (ACD)

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Presentation transcript:

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 1 GLAST Large Area Telescope: AntiCoincidence Detector (ACD) Overview of the Design WBS David J. Thompson NASA Goddard Space Flight Center ACD Subsystem Manager Gamma-ray Large Area Space Telescope

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 2 Level III Key Requirements Summary Reference: LAT-SS-00016

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 3 Meeting the ACD Requirements REQUIREMENT – average particle detection efficiency ACHIEVED BY HIGH DETECTION EFFICIENCY, NO GAPS –1 cm thick plastic scintillator –light collection by waveshifting fibers (for uniformity) –light detection by phototubes (gain ~10 6 ) –overlapping tiles in one dimension on faces and at corners –covering gaps in other dimension with scintillating fiber ribbons REQUIREMENT - < 20% self-veto loss due to backsplash ACHIEVED BY SEGMENTATION OF SCINTILLATOR –1000 cm 2 area scintillator tiles at top of instrument –smaller tiles on sides to maintain similar solid angle seen from calorimeter

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 4 Anticoincidence Detector Overview TILE SHELL ASSEMBLY –89 Plastic scintillator tiles –Waveshifting fiber light collection (with clear fiber light guides for long runs) –Two sets of fibers for each tile –Tiles overlap in one dimension –8 scintillating fiber ribbons cover gaps in other dimension (not shown) –Supported on self-standing composite shell –Covered by thermal blanket + micrometeoroid shield (not shown) BASE ELECTRONICS ASSEMBLY –194 photomultiplier tube sensors (2/tile) –12 electronics boards (two sets of 6), each handling up to 18 phototubes. High voltage power supply on each board. Base Electronics Assembly (BEA) Tile Shell Assembly (TSA) Prototype ACD tile read out with Wavelength Shifting Fiber

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 5 ACD Technical Heritage Plastic Scintillator - used in all previous gamma-ray telescopes OSO-3, SAS-2, COS-B, CGRO (all 4 instruments), plus many cosmic ray experiments. Waveshifting fibers - used in GLAST LAT Balloon Flight Engineering Model (BFEM). Waveshifting bars used by HEXTE on RXTE (same material in a different geometry) Photomultiplier tubes - used in all previous gamma-ray telescopes. HEXTE/RXTE used a commercial version of the same tube we are using (Hamamatsu 4443), and GOLF on SOHO used the same tube as the ACD except for the cathode material (Hamamatsu 4444) High Voltage Bias Supplies - used in all previous gamma-ray telescopes, plus many cosmic ray experiments. Electronics - similar ASIC’s (same designer) used on the BFEM. Discriminators, PHA and logic signals similar to many flight instruments.

GLAST LAT ProjectPMT Procurement Review May 24, 2002 AntiCoincidence Detector Design Overview 6 SUMMARY The ACD design meets its requirements using space-flight-proven technologies: plastic scintillator with photomultiplier tube readout.