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335031.0 [No comment] 06.04.2009 13:01 Released

ID: 335031.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Thermal diagnostic of the optical window on board LISA Pathfinder
Authors:Nofrarias, Miquel; Garcia Marin, A. F.; Lobo, Alberto; Heinzel, Gerhard; Ramos-Castro, J.; Sanjuan, J.; Danzmann, Karsten
Date of Publication (YYYY-MM-DD):2007-10-21
Title of Journal:Classical and Quantum Gravity
Issue / Number:20
Start Page:5103
End Page:5121
Review Status:not specified
Audience:Not Specified
Abstract / Description:Vacuum conditions inside the LTP Gravitational Reference Sensor must comply with rather demanding requirements. The Optical Window (OW) is an interface which seals the vacuum enclosure and, at the same time, lets the laser beam go through for interferometric Metrology with the test masses. The OW is a plane-parallel plate clamped in a Titanium flange, and is considerably sensitive to thermal and stress fluctuations. It is critical for the required precision measurements, hence its temperature will be carefully monitored in flight. This paper reports on the results of a series of OW characterisation laboratory runs, intended to study its response to selected thermal signals, as well as their fit to numerical models, and the meaning of the latter. We find that a single pole ARMA transfer function provides a consistent approximation to the OW response to thermal excitations, and derive a relationship with the physical processes taking place in the OW. We also show how system noise reduction can be accomplished by means of that transfer function.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
Identifiers:ISI:000249987800013 [ID No:1]
ISSN:0264-9381 [ID No:2]
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0709.0442v1.pdf  [850,00 Kb] [Comment:arXiv:0709.0442v1]  
cqg7_20_012.pdf  [690,00 Kb] [Comment:Online Journal]