Acceleration of Magnetized Plasmoid by Pulsed Magnetic Coil

Taichi Seki, Tomohiko Asai, Daichi Kobayashi, Ryotaro Yanag, Hiroshi Gota, Thomas Roche, Tadafumi Matsumoto

Research output: Contribution to journalArticlepeer-review


Compact toroid injection has been proposed as a particle fueling technique for the core region of fusion plasmas. An accelerated plasmoid penetrates through confinement magnetic fields and reaches the core region of target plasmas. To inject plasmoids into the magnetically confined plasmas featuring strong confinement fields, the injection velocity should be increased. The injection velocity depends on the operating conditions of the compact toroid injector such as charging voltage and gas pressure. Changing these conditions is not preferable as it affected not only the injection velocity but also other plasmoid parameters. Pulsed magnetic coil has been introduced for the additional acceleration of the ejected plasmoid. The pulsed field was produced by the current flowing through a one-turn coil installed at the muzzle of the magnetized coaxial plasma gun. The acceleration of ejected plasmoid by pulsed magnetic coil was experimentally verified. Application of pulsed magnetic field resulted in velocity increase up to approximately 50% compared to the average velocity without additional acceleration.

Original languageEnglish
Pages (from-to)2401020-1-2401020-4
JournalPlasma and Fusion Research
Publication statusPublished - 2021


  • compact toroid
  • compact toroid injection
  • fueling
  • magnetized coaxial plasma gun
  • magnetized plasmoid


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