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Cosmic-ray spectra near the LISA orbit

C Grimani1, H Vocca2, M Barone1, R Stanga3, F Vetrano1, A Viceré1, P Amico2, L Bosi2, F Marchesoni4, M Punturo5 and F Travasso2

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Cosmic-ray particles traverse the LISA apparatus charging the proof masses. This process causes spurious Coulomb forces between the test masses and the surrounding conducting surfaces mimicking gravitational wave signals. Approximately 13 g cm−2 of matter overlies the proof masses. The nucleonic component of cosmic rays (about 99% of the total) below 100 MeV/n stops inside the spacecraft without reaching the masses. It is of major importance to determine the primary and solar cosmic-ray particle fluxes above this energy near the LISA orbit in order to predict the effect on the apparatus.


PACS

96.50.sb Composition, energy spectra and interactions

04.80.Nn Gravitational wave detectors and experiments

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

MSC

83C35 Gravitational waves

Subjects

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 5 (7 March 2004)

Received 29 August 2003

Published 9 February 2004



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