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Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..456...31p&link_type=abstract
The second international laser interferometer space antenna symposium (LISA) on the detection and observation of gravitational w
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3
Gravitational Wave Detectors And Experiments, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques
Scientific paper
The current LISA concept has three spacecraft each with two telescope arms protected by a `Y'-shaped' tube. Thermal mathematical models were established using ESARAD and ESATAN using the latest configuration drawings and design details contained within v0.3 of the Payload Definition Document. The thermal design was refined and the sensitivity of the optics bench and other payload components to disturbances in solar irradiation and power dissipation was determined and compared with defined requirements. The predicted steady state temperatures were used in a finite element model using I-DEAS to determine thermally induced distortions. This 4500 node model was used as input data to a spread sheet evaluation of the gravitational influence of the payload components at a point arbitrarily chosen to be the center of the one of the payload optics benches. The resultant acceleration due to all of the nodes, initially all at uniform temperature, was calculated as a straight forward vector summation of the influence of each node. This assumes that each could be regarded as an independent point in space defined by a point mass and location as given in the finite element model. The thermally induced distortions were then applied to the model and the resultant acceleration recalculated.
Kent Barry
Peskett Simon
Sandford Michael
Whalley Martin
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