Force measurements of a superconducting-film actuator for a cryogenic interferometric gravitational-wave detector
N.Sato, T.Haruyama, N.Kanda, K.Kuroda, S.Miyoki, M.Ohashi, Y.Saito,, T.Shintomi, T.Suzuki, D.Tatsumi, C.Taylor, T.Tomaru, T.Uchiyama, A.Yamamoto
TL;DR
This study measures the force exerted by a superconducting YBCO film actuator at cryogenic temperatures, demonstrating its potential for precise mirror control in gravitational-wave detectors.
Contribution
It introduces a superconducting-film actuator capable of exerting measurable forces at cryogenic temperatures for use in gravitational-wave interferometers.
Findings
Force up to 0.2 mN achieved
YBCO film effective at 77 K
Potential for mirror displacement in LCGT
Abstract
We measured forces applied by an actuator with a YBCO film at near 77 K for the Large-scale Cryogenic Gravitational-wave Telescope (LCGT) project. An actuator consisting of both a YBCO film of 1.6 micrometers thickness and 0.81 square centimeters area and a solenoid coil exerted a force of up to 0.2 mN on a test mass. The presented actuator system can be used to displace the mirror of LCGT for fringe lock of the interferometer.
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