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Interpretation of complex patterns observed in the electron-cyclotron instability of a mirror confined plasma produced by an ECR discharge

A G Shalashov, S V Golubev, E D Gospodchikov, D A Mansfeld, M E Viktorov2012年Plasma Physics and Controlled FusionIF 2.2出版社

A specific nonlinear regime of electron-cyclotron instability is discussed aimed at explaining the complex temporal patterns of stimulated electromagnetic radiation from a mirror trap with a non-equilibrium plasma typical of an ECR discharge. This regime is characterized by self-modulation of a plasma cyclotron maser due to coherent interference of two counter-propagating unstable waves with degenerate frequencies resulting in the spatial modulation of the amplification coefficient. The proposed simple theoretical model allows one to reproduce the multi-scale time behavior of quasiperiodic pulses of electromagnetic radiation and related precipitation of energetic electrons detected in a laboratory setup based on a magnetic mirror trap with a plasma sustained by mm-wave gyrotron radiation.

日本語訳

特定の非線形電子サイクロトロン不安定性の領域について、磁気ミラー閉じ込め装置における非平衡プラズマ(典型的なECR放電)からの誘導電磁放射の複雑な時間パターンを説明することを目的として考察する。この領域は、縮退周波数を持つ2つの対向伝播する不安定波のコヒーレント干渉によるプラズマサイクロトロンメーザーの自己変調を特徴とし、その結果、増幅係数の空間変調が生じる。提案された簡潔な理論モデルにより、ミリ波ジャイロトロン放射によって維持される磁気ミラー閉じ込め装置を用いた実験室セットアップで検出された、準周期的電磁放射パルスと関連するエネルギー電子の沈着のマルチスケール時間挙動を再現することが可能となる。

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Electron cyclotron resonanceCyclotron instability
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