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

被引：0

作者：

Tanaka F. ^{[1
]}

Asai T. ^{[1
]}

Sekiguchi J. ^{[1
]}

Takahashi T. ^{[1
]}

Ishiwata J. ^{[1
]}

Edo T. ^{[1
]}

Ono N. ^{[1
]}

Matsui K. ^{[1
]}

Watanabe S. ^{[1
]}

Hishida D. ^{[1
]}

Kobayashi D. ^{[1
]}

Hirose Y. ^{[1
]}

Hosozawa A. ^{[1
]}

Mok Y. ^{[2
]}

Dettrick S. ^{[2
]}

Roche T. ^{[2
]}

Gota H. ^{[2
]}

Binderbauer M.W. ^{[2
]}

Tajima T. ^{[2
,3
]}

机构：

[1] College of Science and Technology, Nihon University, Tokyo

[2] TAE Technologies, Inc., 19631 Pauling, Foothill Ranch, 92610, CA

[3] Department of Physics and Astronomy, University of California at Irvine, Irvine, 92697, CA

来源：

Asai, Tomohiko (asai.tomohiko@nihon-u.ac.jp) | 2018年 / Japan Society of Plasma Science and Nuclear Fusion Research卷 / 13期

基金：

日本学术振兴会;

关键词：

2D resistive MHD simulation; Field-reversed configuration; FRC merging; High beta plasma; Magnetically confined plasma;

D O I：

10.1585/PFR.13.3402098

中图分类号：

学科分类号：

摘要：

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. © 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.

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