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We present design and construction details of an all solid-state power supply suitable for dc electromagnets in the impedance range 500–1300 Ω. Current is limited to a conservative 2 A. Current control is implemented through a series element consisting of cascaded, water-cooled power transistors isolated and regulated to operate at equally spaced voltage intervals within the transistor voltage rating. Current regulation is estimated to be a few parts in 105 for a 10% voltage or load change. Conversion of existing tube-type power supplies to this configuration is detailed.

under contract number W-7405-Eng-48. Reference to a company or product name does not imply approval or recommendation of the product by the LTniversity of California or the U.S. Department of Energy to the exclusion of the others that may be suitable.