Collisional merging process of field-reversed configuration plasmas in the FAT-CM device

Fumiyuki Tanaka, Tomohiko Asai, Junichi Sekiguchi, Tsutomu Takahashi, Junpei Ishiwata, Takahiro Edo, Naoto Ono, Keisuke Matsui, Shintarou Watanabe, Daiki Hishida, Daichi Kobayashi, Yousuke Hirose, Akiyoshi Hosozawa, Yung Mok, Sean Dettrick, Thomas Roche, Hiroshi Gota, Michl W. Binderbauer, Toshiki Tajima

研究成果: ジャーナルへの寄稿記事査読

5 被引用数 (Scopus)

抄録

In order to investigate the collisional merging process of field-reversed configurations (FRCs), the FAT device has recently been upgraded to FAT-CM, consisting of two field-reversed theta-pinch (FRTP) formation sections and the confinement section. Collisional merging of the two FRCs causes a conversion of the kinetic energy to mostly thermal ion energy, resulting in an increase of the ion pressure that greatly expands the FRC size/volume. This increase of the FRC size is observed by magnetic diagnostics in the confinement region, leading to an increase in the excluded flux; on a side note, these characteristics/phenomena have also been observed in C- 2/C-2U experiments at TAE Technologies. The process of FRC formation, translation and collisional merging in FAT-CM has been simulated by Lamy Ridge, 2D resistive magnetohydrodynamics code, in which the same phenomenon of the excluded-flux increase via FRC collisional merging has been observed. Simulation results also indicate that there is an importance of the external magnetic field structure/profile in the confinement region, clearly affecting the FRC merging. Steeper magnetic field gradient by a strong mirror field appears to suppress the axial expansion of collided FRCs and lead a merged FRC to higher temperature.

本文言語英語
論文番号3402098
ジャーナルPlasma and Fusion Research
13
DOI
出版ステータス出版済み - 2018

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