A high-power magnetically switched superconducting rectifier operating at 5 hz

Abstract

Above a certain current level, the use of a super-conducting rcectifier as a cryogenic current source offers advantages compared to the use of a power supply at room temperature which requires large current feedthroughs into the cryostat. In some cases, the power of such a rectifier is Immaterial., for example if it is to be used as a current supply for short test samples with low inductances. Usually however, a rectifier is intended to energize large superconducting magnets, so the maximum power available becomes an important parameter since it determines the loading time. One method of increasing the power of a rectifier is to raise the operating frequency In this respect, magnetically controlled switches with very fast switching times are preferable to thermally controlled ones. This paper reports on the design, as well as the experimental result, of a magnetically switched full-wave superconducting rectifier. Once this rectifier is brought to its design frequency of 5 Hz, the average power delivered to the cryogenic load will be 500 w. © 1987 IEEE.