Present status of a pressurized superfluid helium cooling and its related high field superconducting magnet is reviewed. The research and development of high field superconducting magnets employing multifilamentary superconducting wires have been performed so far. NbTi alloy and Nb3Sn compound superconducting wires have indicated their own properties enough to be high field superconductors and have been practically applied for high field superconducting magnets. In order to construct high field superconducting magnets, the optimization of a coil structure which enables us to stand a huge electromagnetic force and effectively to generate a magnetic field is needed. It is desired that the pressurized superfluid helium cooling will contribute to the optimization of superconducting magnets and will improve their performances in high fields.
There is presently an urgent need in space cryogenics for the development of highly efficient and reliable, and light weight cooling systems as well as the development of high performance heat pipes and radiation heat rejection systems. This article describes infrared sensors and cooling system requirements, and representative cryocooler systems developed since the 1970's for on board satellite use.
The development and applications of high resolution magnet system in National Research Institute for Metals are reported. The high resolution magnet system consists of three different sub-systems to cover various types of experiments under high resolution magnetic fields. The three sub-systems are designed for the detection of the quantum oscillations, for broad band solid state NMR experiments and for high resolution solid state NMR experiments, respectively. The purpose and specifications of each sub-system are described together with a brief introduction to each experiment. Typical examples of applications such as the de Haas-van Alphen effect of heavy Fermion compound UGe2, broad band solid state NMR of high Tc oxide and high resolution solid state NMR of 17O in Glycine are given to demonstrate the potentiality of the sub-systems.