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As the heart of the circular induction accelerator, the SPS has recently been developed up to a fourth generation system that uses newly developed 3.3\u00a0kV high-speed SiC metal\u2013oxide\u2013semiconductor field-effect transistors(MOSFETs). The updates involved in this new SPS include the use of two parallel MOSFETs in each arm to shunt heat dissipation at high frequencies, optimization of the bus pattern, with low parasitic capacitance among the arms to improve the drain\u2013source voltage (VDS) balance, and addition of current sampling circuits to provide an economical method to monitor the operating status in large-scale application scenarios. The heat power and temperature characteristics of the MOSFETs were studied specifically in both individual tests and SPS tests. To date, the new SPS has achieved 2.5 kV-17.4\u00a0A bipolar output at 350\u00a0kHz in continuous mode operation. The highest junction temperature of the MOSFETs was estimated to be 98\u2009\u00b0C.<\/jats:p>","DOI":"10.1063\/5.0137660","type":"journal-article","created":{"date-parts":[[2023,5,23]],"date-time":"2023-05-23T12:37:27Z","timestamp":1684845447000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["Fourth generation switching power supply for circular induction accelerators"],"prefix":"10.1063","volume":"94","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7171-0729","authenticated-orcid":false,"given":"Yi","family":"Liu","sequence":"first","affiliation":[{"name":"Institute of Fluid Physics, China Academy of Engineering Physics 1 , Mianyang 621900, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1059-2807","authenticated-orcid":false,"given":"Katsuya","family":"Okamura","sequence":"additional","affiliation":[{"name":"Accelerator Laboratory, High Energy Accelerator Research Organization 2 , Tsukuba 305-0801, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9159-7580","authenticated-orcid":false,"given":"Ken","family":"Takayama","sequence":"additional","affiliation":[{"name":"Accelerator Laboratory, High Energy Accelerator Research Organization 2 , Tsukuba 305-0801, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2023,5,23]]},"reference":[{"key":"2023081108492971600_c1","doi-asserted-by":"publisher","first-page":"304","DOI":"10.1016\/s0168-9002(00)00557-x","volume":"451","year":"2000","journal-title":"Nucl. 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