A Compact Rotating 1K Cryostat for Helium 4 Studies

Makiuchi, Takahiko; Murakawa, Satoshi; Shirahama, Keiya

doi:10.1007/s10909-016-1709-3

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Laser Physics Letters1

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2018

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“…The simplest way to achieve all that is to rotate vessel with liquid He II, because the array of parallel to the axis of rotation vortices with the density proportional to the speed of rotation has to appear in the case [5]. For such purposes the rotation of whole cryostats is usually organized [28][29][30]. However the speed of rotation of heavy and large helium cryostat could not exceed few revolutions per second.…”

Section: Laser Physics Lettersmentioning

confidence: 99%

The nanowires growth by laser ablation of metals inside rotating superfluid helium

et al. 2018

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Under laser ablation of metals into superfluid helium (He II), in contrast to the widely used laser ablation in all other liquids, the main product of condensation is thin nanowires. In this case, however, the faults as the inclusions in the wire core of the spherical nanoparticles, similar to those which are condensation products in ordinary liquids, take place. It has been shown experimentally that the rotation of a reactor with He II, together with the replacement of laser target above the He II surface dramatically improves the structure of nanowires such produced and increases their length. Such behavior is explained both by the regularization of the array of vortices in the rotating He II and by the reducing the local density of the metal in liquid helium when the laser target is located in a gas.

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