No abstract available

[en] The Symposium on Technology in Laboratories was held on March 19 and 20, 1991 at Toki-Bunka Plaza in Toki City, Gifu Prefecture, Japan. This symposium was hosted by National Institute for Fusion Science (NIFS). There were about 280 participants from many Japanese universities and laboratories, and from some Japanese industrial world. Eighty papers were presented in the symposium. Technical experience and new techniques were reported and discussed being divided into five sessions; technologies of fabrication, cryogenics, diagnostic and control system, computer and experimental apparatus. (author)

[en] To assess superconductor stability, a complete program is developed to obtain basic information on the effects of local mechanical perturbations on the cryostatic stability. An analytical model for computing the transient recovery following the mechanical perturbation is developed. A test program is undertaken to develop data needed to verify the conclusions reached through the analytical studies

[en] To measure a very low-level heat flux, about one microwatt, with maximum precision, it was decided to make use of the possibilities offered in the temperature range of a few degrees Kelvin using liquid helium. The method described is reserved for applications were the heat source can be cooled to about 2 deg K without trouble, which is the case for nuclear radiation measurements

[en] In the known cryostat designs a studied sample which is fixed in the holder of an X-ray device is cooled by a stream of cold gas going from the cryostat jet to the ambient. However, since the jet end is covered with ice, the temperature of the sample cannot be lower than - 150 deg C. Furthermore, the geometry of X-raying is considerably limited because the heater intended for preventing jet icing is located directly on the latter. The purpose of the invention is to extend the temperature range of cooling studied samples towards the lower temperature and to reduce a ''blind'' zone during X-raying. This purpose attained is in that the thermally insulating bush of the jet carries a thin-walled cap piece made of a highly heat-conducting material, say, in the form of a cone, and that the external heater is connected to this cap piece end removed at some distance from the cryostat jet

[en] In this note I describe an inexpensive and simple laser-based method to measure the flatness of the LSST focal plane assembly (FPA) in situ, i.e. while the FPA is inside its cryostat, at -100 C and under vacuum. The method may also allow measurement of the distance of the FPA to lens L3, and may be sensitive enough to measure gravity- and pressure-induced deformations of L3 as well. The accuracy of the method shows promise to be better than 1 micron

[en] To increase the efficiency of the fuel injection into a thermonuclear facility a solid fuel pellet injector is developed. The injector comprises a cryostat, a casing representing a stack of plates moving relatively each other. Each plate has three equal diameter holes forming channels. It is shown that injection efficiency has increased 3 times as compared to the prototype

[en] The document includes following topics: General remarks, helium quality, design aspects (cryostat design, needle valve design and automation, material junctions), operational aspects (standard cryostats: service, preparation, cold valve mode; special cryostats: cryomagnet, sorption cryostat, dilution fridge; temperature control), information (training procedures, documentation) and summary of recommendations

[en] Short note

[en] To meet the growing demand for a compact cooling solution for superconducting electronic devices, we developed a two-stage 2 K GM cryocooler and a cryostat system, which can reach 46.3 K / 2.2 K on the first and second stages under no-load conditions. Nevertheless, with several innovative technologies applied, the total length of the expander cylinder is reduced to under 70% of the smallest conventional 4 K GM cryocooler. In this paper we will present the design method, including material selection and structure design with detailed explanation, which has been confirmed by both simulation and experiment. (paper)