Ultra stable magnetic suspensions for rotors in gravity experiments

Cheung, Wan‐Sup; Gillies, G. T.; Leyh, C. H.; Ritter, R. C.

doi:10.1016/0141-6359(80)90006-9

Cited by 12 publications

(1 citation statement)

References 5 publications

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“…[la] the power loss to eddy currents goes as as. But since the kinetic energy is E = Iw2/2, and since the decay time is r* = E/E, (13) the decay-time spectra would be expected to go as w3' ', i.e., the effect would be most pronounced at low w . However, the skin depth of aluminium in all of our experiments exceeds the disc thickness so another w-dependence is presentone which we have not attempted to evaluate.…”

Section: A Fluctuations In Rotor Periodmentioning

confidence: 99%

Fundamental Measurements in Gravitational Physics Using Precision Rotations: I. Motivations and Unprotected-Rotor Results

1982

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Decay time constants for magnetically-suspended rotors undergoing inertial spin-down have been measured at room temperature. Bearing-rotor interactions have been studied and evidence found that there is a driving mechanism capable of accelerating or decelerating a rotor with a moment of inertia of = 1100 g cm2 at the 1 0-14 W level. The complicated rotor decay structure suggests that there exist unfavorable rotational frequencies at whch mode coupling exists and leads to unavoidably large levels of angular momentum dissipation. The length of the rotors (= 20 cm) also produces a pendulum motion which at times results in ambiguities in the spindown data due to interference with the normal operation of the optical-lever timing system.

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Section: A Fluctuations In Rotor Periodmentioning

confidence: 99%