SC Magnet Research Articles

A 2 kW He refrigerator for SC magnet tests down to 3.3 K

At the Kernforschungszentrum Karlsruhe (KfK), Germany, a new flexible He refrigerator/liquefier with a 4.4 K equivalent cooling power of 2 kW has been installed. The plant will be used to test sc model coils for the Next European Torus (NET) and the International Thermonuclear Experimental Reactor (ITER) in the TOSKA UP facility as well as for other cryogenic experiments. The basic capacity of the refrigerator is simultaneously 700 W at 3.3 K, 400 W at 4.4 K, 1000 W at 70 K and 4 g/s liquefaction. Refrigeration increase is possible with liquid nitrogen precooling and also with liquid He from the 10,000 liter tank. For the cooldown of large magnet systems 20 kW are available down to 80 K.

Magnet system for a superconducting magnetic separator

Abstract A magnetic separator with superconducting magnets has been designed, constructed and successfully tested. Its application is sorting finely ground ores or minerals with low susceptibility. The system can be described as a superconducting drum separator combining the advantages of the well known reliable conventional drum separators with the advantage of high magnetic field economically produced by superconducting magnets. This laboratory magnetic separator with a relevant drum diameter of 1 m served as a first step on the way to an industrial pilot plant. This paper reports on design, construction, and test of the sc magnet system and its supply.

粉末充てん複合エポキシ樹脂の開発

Epoxy resins and their composites are useful materials at low temperature due to their high strength and low thermal conductivity. But such materials, in general, have relatively high thermal contraction compared with that of metals.Use of epoxy resin composites conjuction with metals leads to formation of cracks due to differential thermal contraction when they are cooled to low temperature. In the case of SC magnet it will be the cause of degradation and training effects.Powder filled epoxy composites which were elliminated these disadvantages were developed by suitable choice of fillers and epoxy resins. These composites thus developed have following features; the similar thermal contraction to that of any metal, enough strength as a constituent material, and good handling properties in molding processes. Compositions of composites and their properties measured are reported.