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- W2068893345 abstract "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 ne=7×1016 m-3 were produced with a filling gas pressure of pn=4×10-2 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 ( pn=1.5×10-3 Pa). It also enables over-dense plasma production (ne=1.5×1017 m-3, while cutoff density is 7.6×1016 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 (∼87%) in the Mini-RT device, the over-dense plasma production is thought to be caused by heating with electron Bernstein wave (EBW)." @default.
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- W2068893345 date "2006-06-08" @default.
- W2068893345 modified "2023-10-03" @default.
- W2068893345 title "Plasma Production by Electron Cyclotron Heating on the Internal Coil Device Mini-RT" @default.
- W2068893345 doi "https://doi.org/10.1143/jjap.45.5197" @default.
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