Effect of Collision Axes Offset of the Plasmoid in the Collisional Merging Process of FRC Plasma

SOMEYA, Hiroki; ASAI, Tomohiko; Kobayashi, Daiji; Seki, T.; YAMANAKA, Takuto; Watanabe, Takeharu; Takahashi, Tsutomu; Mizuguchi, Nobuaki

doi:10.1585/pfr.17.2402068

Cited by 1 publication

(1 citation statement)

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“…However, they would interfere with the head-on collisions of the translated FRCs during the collisional merging formation process. Three-dimensional MHD simulations predict that the FRC may collapse in asymmetric collisions even if the asymmetric component is only 0.1% [16].…”

Section: Introductionmentioning

confidence: 99%

Suppression of radial motion in translated field-reversed configuration plasma via global gyro-effect

Kobayashi,

Seki,

Takahashi

et al. 2024

Plasma Phys. Control. Fusion

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The radial motion of a field-reversed configuration (FRC) during translation at supersonic/Alfvénic speed was effectively suppressed by the global gyro-effect induced by toroidal flow. In magnetohydrodynamic approximation, an FRC is inherently unstable against radial motions such as tilt and wobble. Surprisingly, the magnetic structure of the FRC remained intact even during translation at speeds exceeding the ion sonic and Alfvén speeds, despite the presence of radial motions. Optical observations were conducted on the radial motion and toroidal flow of translated FRCs under various electric boundary conditions at the device end. The implementation of end-shorting led to an increased toroidal flow rate, consequently reducing the radial displacement of the FRC during translation. This control of toroidal flow from the device’s end not only suppressed radial motion but also facilitated head-on collisions in the formation of FRCs by the collisional merging technique. The findings emphasize the significance of toroidal flow control in preserving the integrity of FRC’s simply connected geometry and enhancing its formation performance.

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Section: Introductionmentioning

confidence: 99%