LAT Environmental Verification Test Facility Requirements

Martin Nordby 13 Apr 2001

Test Facilities

	The list covers GSE needed only for verification of environmental requirements in the LAT Performance Specification.
	This list does not include GSE for beam test and performance testing.
	Lesson from this list is that we have plenty of GSE needed to run these tests.
	Requirements of GSE and facilities should be identified now, as we spec the tests. These Facility Specifications can then be used as a template for others to use in planning the details of the test.
	This GSE will obviously drive the cost of the tests.

SC Interface Testing

	SC simulator from SC contractor: use to verify LAT-SC communications, and during LAT testing
	Grid/SC interface gauge: use to check mechanical interface to SC
	3-D interface template: use to check clearances under LAT

Mass, Center of Gravity, Dimensional Inspection

	Calibrated 5000 kg scale: crane-mounted
	Calibrated scales: 2 each with 2500 kg capacity, floor-mounted
	Temporary supports: to set the LAT on while weighing LAT and measuring center of gravity
	Torque measuring device: either on shaft/motor of integration stand, or independent: for integration stand, to determine center of gravity
	Calibrated surveying equipment: with pre-set coordinate system set up in clean room: use to survey LAT position

Power

Voltage and current monitoring system: monitors voltage and total current draw during performance testing. Includes over-current protection monitor and controller either to shut off test, or report fault to Test Controller.

Thermal Testing (in air and vacuum)

	Temperature- and humidity-controlled environment for LAT: enclosure to control environment during testing on integration stand
	Heat-removal system for LAT: cooling system to control LAT temperature during testing on integration stand. Needs closed-loop chiller if we need to run over entire LAT temperature ranges
	Thermal ground plates: mount to the LAT in place of Radiators, and used to drive LAT in the thermal-vacuum chamber.
	Radiative heat source: to verify thermal performance of thermal shielding while in thermal-vacuum chamber (not clear we need or want this).
	Dummy thermal loads: use on Qual Grid for thermal balance testing.
	SIU GSE to control LAT: use to control LAT during testing during integration and environmental testing. Must communicate with Test Controller.
	Test Controller GSE: control system for running LAT in controlled thermal environment. Includes thermocouples; humidity monitors; controller hardware, software, and user interface; power supplies for heaters
	Thermal-vacuum chamber: large enough to fit LAT with Radiators deployed horizontally for thermal-balance test. Includes cold walls and sun and earth simulators.
	Thermal-vacuum chamber: large enough to fit LAT without Radiators. Includes insulated shroud, control system to run test.

Structural Testing (vibe, proof, acoustic)

	Vibe support fixture: GSE to support LAT with same compliance as SC interface structure. This is LAT mounting fixture on vibe table. It should attempt to either reproduce the SC structure, or be as solid as possible.
	Fake Radiator Structure: plate to simulate stiffness of Radiators mounted to Grid. Need to add artificial stiffness, mass, and moment, to reproduce effects of Radiators.
	Dummy masses: used during Qual Grid vibration testing, to simulate mass and moments of TKR and CAL modules.
	Test Monitoring GSE: system to monitor accelerometers and strain gauges on Qual Grid during vibration testing. Use this on flight LAT during shake testing, as well (and for Observatory shake testing).
	Large shake table: for vibration testing Qual Grid with dummy masses.
	Acoustic chamber: for acoustic testing the flight LAT. Not clear we will do this test.