15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

10.56 Observation of dynamic processes in the collisional merging of field-reversed configurations

18 Apr 2018, 10:30
2h 31m
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Junichi Sekiguchi (Nihon University) Tomohiko Asai (Nihon University) Tsutomu Takahashi (Nihon University) Daiki Hishida (Nihon University) Fumiyuki Tanaka (Nihon University) Akiyoshi Hosozawa (Nihon University) Thomas Roche (Tri Alpha Energy, Inc.) Hiroshi Gota (Tri Alpha Energy, Inc.)

Description

Performance of the diagnostics suite device and initial observation results of collisional merging experiments in the FAT-CM device are presented. The FAT-CM device, consisting of two FRTP formation sections and a confinement section, has been developed to investigate the collisional merging process and the propagation properties of low-frequency wave in the high-beta compact toroid of field-reversed configurations (FRCs). In the FAT-FRC experiments, the dynamic process of collisional merging of FRCs at the relative velocity of 200-400km/s is observed by both magnetic and optical measurements. The typical parameters of merged FRC in the initial series of experiments are ~ 0.2 m in radius, ~ 2 m in length, electron density ~ 1x10^20 m^-3, external magnetic field ~ 0.07 T and total temperature ~ 100 eV in the equilibrium phase. Electron density of the merged FRC measured by two movable interferometers is approximately 10 times higher than the previous research at C-2U FRC [H. Gota et al., Nucl. Fusion 57, 116021 (2017)]. Also, the oscillating signal on the line-integrated electron density represents the rotational instability with toroidal mode number n = 2 is observed as one of the evidence of the formation of high-density FRC plasmas.

Primary author

Junichi Sekiguchi (Nihon University)

Co-authors

Tomohiko Asai (Nihon University) Tsutomu Takahashi (Nihon University) Daiki Hishida (Nihon University) Fumiyuki Tanaka (Nihon University) Akiyoshi Hosozawa (Nihon University) Thomas Roche (Tri Alpha Energy, Inc.) Hiroshi Gota (Tri Alpha Energy, Inc.)

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