Characteristics of Hot Electron Ring in a Simple Magnetic Mirror Field
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概要
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Characteristics of hot electron ring are studied in a simple magnetic mirror machine (mirror ratio 2 : 1) with a diameter of 30cm at the midplane and with the distance of 80cm between the mirrors. Maximum microwave input power is 5kW at 6.4GHz with the corresponding power density of approximately 0.3W/cm^3. With a background cold plasma of 4×10^<11>cm^<-3>, hot electron rings are most effectively generated in two cases when the magnetic field on the axis of the midplane is set near the fundamental or the second harmonic electron cyclotron resonance to the applied microwave frequency. Density profile of the hot electrons is observed to take a so-called ring shape with a radius controllable by the magnetic field intensity and with an axial length of approximately 10cm. The radial cut view of the ring, however, indicates an M shape density profile, and the density of the hot electrons on the axis is about one half of the density at the ring. Approximately 30 msec is needed before generating the hot electron ring at the density of 10^<10>cm^<-3> with an average kinetic energy of 100keV. The ultimate energy distribution function is observed to have a stepwise cut in the high energy tail and no energetic components above 1 MeV are detected. The hot electron ring is susceptible to a few instabilities which can be artificially triggered. One of the instabilities is observed to associate with a loss of lower energetic electrons and microwave bursts. At the instability, the ring shape is observed to transform into a filled cylinder in a few microseconds and disappear.
- 核融合科学研究所の論文
著者
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Ikegami H.
Research Information Center Institute Of Plasma Physice Nagoya University
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Hosokawa M.
Research Information Center Institute Of Plasma Physics Nagoya University
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