FRC Formation Process of Two Colliding Spheromaks with Counterhelicity

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概要

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• A merging formation of field-reversed configuration (FRC) has been studied for the first time without central conductor, using two merging spheromaks with opposing toroidal magnetic field. Without the n=1 stabilization effect of the central conductor, the merging process was maintained stably probably due to (1) plasma flow shear generated by the counterhelicity reconnection and (2) line-tying effect of the magnetic field lines. This relaxation from the force-free (≈0.05-0.1) spheromaks to the high-beta (≈0.7-1) FRC is attributed to efficient (≈80%) conversion of the toroidal magnetic energy of the former to the ion thermal energy of the latter. This energy conversion was caused by a direct ion heating and acceleration effect of reconnection under the toroidally symmetric condition. This ion heating energy was found to increase inversely with the field amplitude parallel to the X-point line. Further plasma acceleration by high-field compression was observed to increase the reconnection speed, revealing the new fast reconnection mechanism called the current sheet ejection.

• 社団法人 電気学会の論文
• 2004-01-01

著者

• ONO Yasushi

  High Temperature Plasma Center, University of Tokyo

• Ono Y

  High Temperature Plasma Center The University Of Tokyo

• UMEDA Kotaro

  High Temperature Plasma Center, The University of Tokyo

• Umeda Kotaro

  High Temperature Plasma Center The University Of Tokyo

• Ono Yasushi

  High Temperature Plasma Center University Of Tokyo

関連論文

• Ion Kinetic Relaxation of Two Merging Spheromaks to an FRC
• FRC Formation Process of Two Colliding Spheromaks with Counterhelicity
• High-power heating of spherical tori by use of magnetic reconnection

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