High voltage electrical system of 8.56 GHz CW klystron for electron cyclotron heating on QUEST spherical tokamak

Takumi Onchi, Hiroshi Idei, K. Nakamura, T. Nagata, S. Kawasaki, R. Ashida, M. Fukuyama, Makoto Hasegawa, Ryuya Ikezoe, A. Higashijima, K. Kuroda, Yoshihiko Nagashima, Kazuaki Hanada

Research output: Contribution to journalArticle

Abstract

A high voltage DC power supply for the cathode of the 8.56 GHz CW klystron has been set up for electron cyclotron heating (ECH)in steady state tokamak operation on QUEST spherical tokamak. The power supply is equipped with an IGBT array and a reactor for fast shutoff of the voltage in 10 μs, where the influx of electric energy at the short circuit is limited to 5 J. AC switches also have been installed in the three-phase power lines. High voltage relays are useful to save electric energy consumption. Fast three-phase AC switching by IGBT-stack is applicable to reduce the electric load of the components of the klystron power supply.

Original languageEnglish
JournalFusion Engineering and Design
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Cyclotrons
Insulated gate bipolar transistors (IGBT)
Heating
Electrons
Electric potential
Electric loads
Short circuit currents
Cathodes
Energy utilization
Switches

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

High voltage electrical system of 8.56 GHz CW klystron for electron cyclotron heating on QUEST spherical tokamak. / Onchi, Takumi; Idei, Hiroshi; Nakamura, K.; Nagata, T.; Kawasaki, S.; Ashida, R.; Fukuyama, M.; Hasegawa, Makoto; Ikezoe, Ryuya; Higashijima, A.; Kuroda, K.; Nagashima, Yoshihiko; Hanada, Kazuaki.

In: Fusion Engineering and Design, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Nagata, T.

AU - Kawasaki, S.

AU - Ashida, R.

AU - Fukuyama, M.

AU - Hasegawa, Makoto

AU - Ikezoe, Ryuya

AU - Higashijima, A.

AU - Kuroda, K.

AU - Nagashima, Yoshihiko

AU - Hanada, Kazuaki

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