caa a22 4500 445365838 CHVBK 20180317142930.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0267-3 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0267-3 Torsional Oscillator Experiments under DC Rotation with Reduced Vibration [Elektronische Daten] [Masahiko Yagi, Akira Kitamura, Nobutaka Shimizu, Yoshinori Yasuta, Minoru Kubota] We describe a highly stable, rotating cryostat designed for torsional oscillator experiments under DC rotation, where vortex lines penetration has been studied for 3D superfluids made of monolayer He films as well as for the supersolid state in hcp solid 4He. Especially, torsional oscillator experiments on hcp solid 4He are known to be quite sensitive to small vibrations or linear velocities on the order of 10μm/s or less. Thus, vibrations of the apparatus may destroy the measurements if they are not smaller than or equal to those of the building or the ground itself. The torsional oscillator performance described here often gives better data under steady rotation at moderate speeds than under stationary conditions. The article describes briefly a design idea shared by the two rotating cryostats at ISSP, the University of Tokyo, and discusses the torsional oscillator (TO) experiments under DC rotation. This is truly a high speed rotating cryostat with maximum rotational speed of at least 6 revolutions per second for TO experiments. It gives also much higher stability at reasonably low rotational speed because of the well-planned structure of the double frame construction with a lot of mass for the upper drive frame for rotation and the almost mechanically isolated, except for the drive mode motion, rotating cryostat with much higher stability of the inner frame for the cryostat mount. Phenomena of quantized vortex lines penetration through a macroscopic superfluid give unique information about the superfluidity itself. A method for detection of vortex lines penetration events using TO technology is also briefly reviewed. Springer Science+Business Media, LLC, 2010 Torsional oscillator nationallicence DC rotation nationallicence Vortex lines nationallicence Vortex lines penetration nationallicence Yagi Masahiko Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut Kitamura Akira Graduate School of Sci. & Tech., Niigata University, Niigata, Japan aut Shimizu Nobutaka Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut Yasuta Yoshinori Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut Kubota Minoru Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 754-761 0022-2291 162:5-6<754 2011 162 10909 https://doi.org/10.1007/s10909-010-0267-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0267-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yagi Masahiko Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut NATIONALLICENCE 700 1- Kitamura Akira Graduate School of Sci. & Tech., Niigata University, Niigata, Japan aut NATIONALLICENCE 700 1- Shimizu Nobutaka Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut NATIONALLICENCE 700 1- Yasuta Yoshinori Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut NATIONALLICENCE 700 1- Kubota Minoru Institute for Solid State Physics (ISSP), The University of Tokyo, 277-8581, Kashiwa, Japan aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 754-761 0022-2291 162:5-6<754 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer