GLAST Large Area Telescope:

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Presentation transcript:

GLAST Large Area Telescope: Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: Tracker Subsystem WBS 4.1.4 2F: Thermal Design Liz Osborne Lockheed Martin Liz.Osborne@lmco.com

Agenda Thermal Design Overview & Requirements Interface to Grid Thermal Model Results Hot Operation, Cold Operation, Survival Minimum Summary & Future Work

Thermal Design Overview Requirements (check) Operating: -15 to +30°C Survival: -30 to +50°C 16 identical towers (25 trays each) 10.2W (hot) and 8.7W (cold) per tower, located on MCM boards Primary heat path is from MCM closeouts on each tray to high conductivity walls (K13), down walls to Grid through heatstraps High emissivity external surfaces promote radiation between towers and to ACD cables

Interface to Grid Copper Straps Copper straps (4 per tower) conduct Q from tower walls to the Grid Between walls and bottom tray Hot: 2.55W/strap RTV interface at Tracker Bolted (dry) at Grid Interface Delta T is 3°C Tracker Walls Not Shown Tracker interface Copper Straps Grid interface

Thermal Model SINDA/TSS Model 82 Nodes/Tower, 1312 total +Z SINDA/TSS Model 82 Nodes/Tower, 1312 total Trays are lumped into groups per tower Top tray Top 5 Standard Trays Bottom 6 Standard trays Heavy Trays Standard No Converter trays Bottom Tray Each Tray Group consists of 1 Tray node, 4 closeout nodes (Q input), 8 wall nodes Copper strap interface to Grid nodes +Y 12 8 13 4 9 14 5 10 15 1 6 11 2 7 3 +X

Thermal Results – Hot (1 of 3) °C Steady State Temperatures Steady State Temperatures Max DT up wall is 6°C (7°C including entire tower) Max Temp, +24°C Located at Bay 5, Top 5 Std Closeout Transient Temperatures Max Tracker Transient, +24°C +Z +Y 15 +X Internal View

Thermal Results – Hot (2 of 3)

Thermal Results – Hot (3 of 3) Trade: Grid/Tower Interface failure, center tower (Bay 5) °C DT steady state increase is 4.4°C Max Temp, +28.4°C Bay 4 Bay 5 Bay 6

Thermal Results - Cold Min Tracker Transient, -3°C

Thermal Results - Survival Minimum Tracker Survival Temperature is –24 °C

Summary & Future Work Summary Tracker Thermal Design Presented Heat conducts from MCM boards to walls, down walls, through copper strap interface to Grid In compliance with Requirements 4.4°C increase with complete failure at Grid/Tracker interface for hottest tower Future Work Update thermal model as necessary Tracker wall material Requirement In Spec With uncertainty Design Margin Operational Temperature -15/+30 C -10/+25 C -3 /+24 C +7 /+1 C Survival Temperature -30/+50 C -25/+45 C -24/TBD C +1 & heater margin/TBD C