Test mass design for the EP experiment on M3 STEP

Details Test mass design for the EP experiment on M3 STEP Test mass design for the EP experiment on M3 STEP

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32.1339l&link_type=abstract

Advances in Space Research, Volume 32, Issue 7, p. 1339-1344.

Computer Science

1

Scientific paper

The design strategy for pairs of test-masses for the Satellite Test of the Equivalence Principle is discussed. Limitations are placed on the possible density ratios for the materials used in each test-mass pair, leading to the conclusion that a fully cyclical test for systematic errors is not possible. The immunity of test-masses to local gravitational influences is considered, and a figure of merit, the `differential acceleration susceptibility' χ(R,θ,ϕ)=Δaz/a, is introduced for any test-pair, such that different designs may usefully be intercompared. The electrostatic patch-effect is described in the context of its potential influence on the STEP test-masses, and the need to prevent azimuthal rotation of the masses is underlined. Two schemes for frictionlessly preventing such azimuthal rotation are discussed: longitudinal grooves, and chordal `flats' on the masses. It is found that the minimum number of grooves (or `flats') that may be used on the STEP test-masses is 6.

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