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Upper hybrid emission from a magnetized gas discharge plasma

R F Ellis, G D Tsakiris, C Z Wang, D A Boyd1986年Plasma Physics and Controlled FusionIF 2.2出版社

Measurements are presented of electromagnetic radiation emitted perpendicular to a strong magnetic field in a gas discharge. The discharge plasma is characterized by electron densities in the range 1010-3*1012 cm-3, an electron temperature of approximately 2 eV, and a dilute energetic electron tail extending out to the discharge voltage (<or approximately=200 V). Emission measurements are made in the frequency range 12-18 GHz. It is shown that the emission is predominantly in the extraordinary mode, originates at the upper hybrid layer in the radially inhomogeneous plasma, and is generated by the energetic electron tail. Combined with earlier detailed measurements of the energetic electron properties it is shown that the emitted power varies linearly with the hot electron density in the vicinity of the upper hybrid radius and varies as the 3/2 power of the tail temperature. Absolute power estimates are provided to link the authors measurements to the fundamental emission parameters. There are indications that tunneling of radiation is not playing a role in these experiments, but this conclusion requires a lot of further study.

日本語訳

強磁場中のガス放電において、磁場に垂直方向に放射される電磁放射の測定結果を提示する。放電プラズマは、10^10〜3×10^12 cm^-3の範囲の電子密度、約2 eVの電子温度、および放電電圧(200 V以下)まで及ぶ希薄な高エネルギー電子テールによって特徴づけられる。放射測定は12〜18 GHzの周波数範囲で行われる。放射は主として異常モードであり、径方向に不均一なプラズマ中の上部混成層で発生し、高エネルギー電子テールによって生成されることが示される。高エネルギー電子の特性に関する以前の詳細な測定と組み合わせることで、放射パワーは上部混成半径付近の高温電子密度に比例して変化し、テール温度の3/2乗に比例して変化することが示される。絶対パワーの推定値は、著者らの測定を基本放射パラメータと関連づけるために提供される。放射のトンネリングがこれらの実験において役割を果たしていないことを示す兆候があるが、この結論にはさらなる研究が多く必要である。

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