Plasma Production by Electron Cyclotron Heating on the Internal Coil Device Mini-RT

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概要

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• The internal coil device Mini-RT (Ring Trap) has been constructed in order to study the extremely high beta plasma confinement predicted in two fluid relaxation theory. Plasma is produced by electron cyclotron heating with a 2.45 GHz, 2.8 kW microwave. Plasma experiments were carried out for two conditions: with a mechanically supported coil, and with a magnetically levitated one. In the case in which the internal coil was mechanically supported, plasma densities up to $n_{\text{e}}=7\times 10^{16}$ m-3 were produced with a filling gas pressure of $ p_{n}=4\times 10^{-2}$ Pa, and plasma could not be available at a gas pressure less than $10^{-2}$ Pa due to the loss of high energy electrons by the supporting structure. It has been clearly demonstrated that the levitation of the internal coil, which was followed by the removal of the supporting structure from the plasma confinement region, improves plasma parameters markedly. The levitation of the internal coil enables plasma production at a lower filling pressure ($ p_{n}=1.5\times 10^{-3}$ Pa). It also enables over-dense plasma production ($n_{\text{e}}=1.5\times 10^{17}$ m-3, while cutoff density is $7.6\times 10^{16}$ m-3 for 2.45 GHz microwave). Since the calculation shows that the efficiency of mode conversion from fast X-mode wave to electron Bernstein wave (FX–SX–B conversion) is sufficiently high (${\sim}87$%) in the Mini-RT device, the over-dense plasma production is thought to be caused by heating with electron Bernstein wave (EBW).

• 2006-06-15

著者

• OGAWA Yuichi

  High Temperature Plasma Center, the University of Tokyo

• Goto Takuya

  Graduate School Of Frontier Sciences The University Of Tokyo

• Yatsuka Eiichi

  Graduate School Of Frontier Sciences The University Of Tokyo

• Morikawa Junji

  Graduate School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

• Morioka Junji

  Graduate School of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan

• Yatsuka Eiichi

  Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan

関連論文

• Experiment on Deflection of High-Speed Plastic Pellets Using Curved Guide Tubes
• Levitation Experiment Using a High-Temperature Superconductor Coil for a Plasma Confinement Device(Superconductors)
• Plasma Production by Electron Cyclotron Heating on the Internal Coil Device Mini-RT
• Inhibition of Electrochemical Fouling against Biomolecules on a Diamond-Like Carbon Electrode
• Plasma Production by Electron Cyclotron Heating on the Internal Coil Device Mini-RT
• Wave Characteristics in the Electron Cyclotron Range of Frequencies in Overdense Plasmas in the Internal Coil Device Mini-RT
• Direct Measurement of a Mode-Converted Electron Bernstein Wave in the Internal Coil Device Mini-RT

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