Systems Integration1 GLAST LAT ProjectMarch 2005 LAT Environmental Test Planning Meeting March 2005 Thermal-Vacuum Testing LAT Environmental Test Planning Meeting March 2005 Thermal-Vacuum Testing Martin NordbyJack Goodman

Systems Integration2 GLAST LAT ProjectMarch 2005 Agenda 8:30 am - 9:00 am Thermal panel design (Jack Goodman) –Thermal design concepts 9:00 am - 9:15 am Thermal panel design (Martin Nordby) –Heating/cooling electrical and gas schematics –Power and feedthrough tally 9:15 am - 9:45 am EGSE cabling (Rich Bielawski) –Cabling schematic, feedthrough pin-outs –Thermal sensor cabling –Routing and wrapping 9:45 am - 10:15 am MGSE (Martin Nordby) –Chamber configuration –Support stand design concept –Cable routing and support 10:15 am - 10:30 am Thermal data acquisition (Jack Goodman, Mike Van Herpe) –Data flow –Communication between chamber DAQ and LAT EGSE 10:30 am - 11:15 am Thermal-Vacuum test sequence walk-through (Martin Nordby) 11:15 am - 12:00 pm Action Item List Status (Martin Nordby)

Systems Integration3 GLAST LAT ProjectMarch 2005 Thermal Panel Design

Systems Integration4 GLAST LAT ProjectMarch 2005 Thermal Panel Cooling Schematic Cooling circuits use boil-off LN2 system Radiator +Y/-Y circuits need to be sized for transient testing –Fast cool-down to simulate eclipse Cooling Zones Rad +Y SC -Y SC +Y Rad -Y T-Vac Chamber wall Grid Chill Bars

Systems Integration5 GLAST LAT ProjectMarch 2005 Thermal Panel Electrical Heating Schematic Each zone shown is computer controlled Radiator +Y and –Y zones are independently controlled, and need 4-5 kW total power per Radiator to provide transient test heat-up capability Heater Zones Rad +Y SC +Y ACD -Y ACD +Z ACD +Y ACD -X ACD +X SC +Z SC +Y Rad +Y

Systems Integration6 GLAST LAT ProjectMarch 2005 Heater Power Requirements and Feedthroughs

Systems Integration7 GLAST LAT ProjectMarch 2005 EGSE Cabling and Feedthroughs

Systems Integration8 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test: Test Configuration LAT on Test Stand Oriented Horizontally LAT rolls into chamber on floor Port plate for LAT elec, gas feedthroughs

Systems Integration9 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test: Test Configuration View from Inside Chamber SIIS, thermal sensor cable routing Front View with Chamber Cut Away Chamber Plan View (PDF file)PDF file

Systems Integration10 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test: MGSE Concept Extension beams double as support legs LAT on Test Stand (Horizontal Configuration) Radiators mounted to Test Stand in vertical orientation Upper extension beams are used for lifting LAT into place, then removed

Systems Integration11 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test: MGSE Concept (cont.) ACD Sink Plates on an independent support frame LAT on Test Stand (Horizontal Configuration) Possible hydraulic assist for rotating detaches for T-Vac

Systems Integration12 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test: Mechanical Issues Known issues to be worked –Trapped air volumes: contamination issue –Thermal stability of support: how level will it keep the LAT and what is requirement –Sink panel design and support: 5 ACD, 3 SC, 2 Rad Requirements list –Leveling: what is accuracy and precision needed for heat pipes; any stability req’s? –Test Stand allowed temps: temperature range that Test Stand may see –Allowed parasitic conduction and radiation to/from Test Stand and other MGSE

Systems Integration13 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test MGSE: Action Item Status T102, T114: clearances in and around T-Vac chamber and chamber dimensions –Chamber model delivered to SLAC and incorporated –Clearance evaluations are in the works T110, T130, T137, T138: define leveling requirements for heat pipes, any muon surveys; inclinometers needed? –No progress T118: MGSE temperature requirements –Agreed to keep Test Stand in a ~-10—+20 degC range –Still working details of heating/cooling/isolation needed T126: agree to structural supports of LAT in T-Vac –Test Stand provides flight-like structural and thermal interface for LAT –Eliminated all options using GPR T127: develop T-Vac STE list –Started list of MGSE, but not complete

Systems Integration14 GLAST LAT ProjectMarch 2005 Thermal Data Acquisition

Systems Integration15 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test Sequence Walk-Through Transport to Thermal-Vacuum Chamber –Open door of T-Vac chamber and set up temporary trolley supports and rails. Roll out trolley from inside T-Vac chamber –Move LAT on Test Stand in horizontal configuration on Cart to T-Vac chamber. –Lift LAT on Test Stand and set down on trolley. Secure on trolley and break rigging. –Move GN2 source and re-route hoses up onto trolley. Test Preparation –Install EGSE crates and run outside cabling from EGSE crates and chamber DAQ to chamber port plates. Make connections to outer feedthroughs. –Connect internal EGSE cabling from inner feedthroughs on port plates. –Check end-to-end continuity of all cabling and connections through to LAT EGSE crates and chamber DAQ. –Mount remainder of specialized test equipment (STE), including thermal panels. –Roll trolley into mouth of T-Vac chamber. –Plumb chiller lines from LAT manifolds through port plate feedthroughs to external chiller. Test. Leave off.

Systems Integration16 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test Sequence Walk-Through (cont. 1) Test Preparation –Connect internal EGSE cabling to LAT. –Run LAT Aliveness test. –Mount thermal instrumentation to LAT, MGSE, and inside of chamber. Connect instrumentation cabling to inner chamber port plate feedthroughs and check. –Mount ACD-XLAT and ACD-Radiator MLI blankets. –Wrap MGSE MLI blankets around Test Stand, instrumentation cabling, and to patch up blanket open regions around Radiator-Grid volume. –Run LAT LPT test. –Dress internal plumbing and electrical lines in preparation for rolling into chamber. –Roll LAT on Test Stand into T-Vac chamber. –Level Test Stand to ensure that heat pipes are within required level. –Re-check all plumbing and electrical lines in preparation for pump-down. –Connect thermal panels to cooling source and connect heaters to port plate feedthroughs. –Connect chamber test instrumentation to port plate connectors on inside of chamber. –Check chamber instrumentation and heating/cooling. Pre-T-Vac Performance Testing –Run LAT CPT test. –Run LAT SVAC and Muon Survey tests. –Turn off GN2 purge and remove purge lines from LAT and Test Stand. –Disassemble dust tent from around LAT and remove from chamber.

Systems Integration17 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test Sequence Walk-Through (cont. 2) T-Vac Test –Close T-Vac chamber door. –Pump down chamber –Bake out LAT and ground support equipment (GSE) inside chamber. –Hot survival: Turn-On, Aliveness tests. –Thermal-balance hot: TCS Perf, LPT tests. –Cold-survival: Heater Check test, LAT Turn-On, LAT Aliveness tests. –Thermal-balance cold: TCS Perf, LPT tests. –Thermal cycle hot (1): CPT test. –Thermal cycle cold (1): CPT test. –Thermal cycle hot (2): LPT test. –Hot plateau: Muon survey. –Thermal cycle cold (2): LPT test. –Cold plateau: Muon survey. –Thermal cycle hot (3): LPT test. –Thermal cycle cold (3): LPT test. –Thermal cycle hot (4): CPT test. –Thermal cycle cold (4): CPT test. –Return to ambient temperature –Vent chamber. –Open T-Vac chamber door. –Run CPT test. –Run LAT SVAC and Muon Survey tests.

Systems Integration18 GLAST LAT ProjectMarch 2005 Thermal-Vacuum Test Sequence Walk-Through (cont. 3) Transport from T-Vac Test –Re-assemble dust tent around LAT. –Re-connect purge lines to LAT and Test Stand. Turn on GN2 purge. –Drain and disconnect chamber thermal panels from chiller lines. Remove panels. –Remove ACD-XLAT and ACD-Radiator MLI blankets. –Disconnect test instrumentation. –Disconnect LAT EGSE cabling from port plate feedthroughs. –Disconnect fly-away and other thermal instrumentation from LAT, Test Stand, and Chamber. Remove. –Drain and disconnect auxiliary cooling lines from Chill Bars and X-LAT Plate. –Roll LAT on T-Vac Test Stand out of chamber. –Lift LAT on Test Stand off trolley. Set down on Cart and secure. –Move GN2 source and re-route hoses down onto Cart. –Move LAT on Test Stand back to High Bay.

Systems Integration19 GLAST LAT ProjectMarch 2005 Action Item List Status

Systems Integration20 GLAST LAT ProjectMarch 2005

Systems Integration21 GLAST LAT ProjectMarch 2005