Force measurements of a superconducting-film actuator for a cryogenic   interferometric gravitational-wave detector
  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. 
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...