Test and operation of high-power RF system for KSTAR helicon current drive system

The helicon current drive system for the efficient off-axis current drive of KSTAR is currently being upgraded with 476 MHz, 1.2 MW klystrons and a new high-voltage power supply (HVPS). Four klystrons, which were used in PEP-II, were transferred to NFRI from the Stanford Linear Accelerator Center. E...

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Bibliographic Details
Published inFusion engineering and design Vol. 166; p. 112301
Main Authors Kim, Jeehyun, Wang, Sonjong, Jang, Kwangho, Lee, Hyunyeong, Wi, Hyunho
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.05.2021
Elsevier Science Ltd
Subjects
Electric power supplies
Helicon current drive
HVPS
Klystron
Klystrons
KSTAR
PSM
RF heating
KSTAR
HVPS
PSM
RF heating
Klystron
Helicon current drive
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Summary:The helicon current drive system for the efficient off-axis current drive of KSTAR is currently being upgraded with 476 MHz, 1.2 MW klystrons and a new high-voltage power supply (HVPS). Four klystrons, which were used in PEP-II, were transferred to NFRI from the Stanford Linear Accelerator Center. Each klystron can generate 1.2 MW of CW RF power at 476 MHz with an 84 kV 24 A beam. Two klystrons will be powered in parallel using a single pulse step modulator HVPS with a rating of 92 kV and 64 A. Herein, a detailed description of the klystron test setup and results obtained during its test is presented. A high-power test of the klystrons is performed, wherein an RF power of 620 kW is generated by a 70 kV and 18.8 A beam.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2021.112301