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Correlation of bremsstrahlung and energy distribution of escaping electrons to study the dynamics of magnetically confined plasma

B S Bhaskar, H Koivisto, O Tarvainen, T Thuillier, V Toivanen, T Kalvas, I Izotov, V Skalyga, R Kronholm, M Marttinen2021年Plasma Physics and Controlled FusionIF 2.2出版社

A combination of electron and bremsstrahlung diagnostics was used to study the properties of the highly charged plasma of an electron cyclotron resonance ion source (ECRIS). The bremsstrahlung radiation in both axial and radial directions was correlated with the energy distribution of the electrons escaping axially from the confined plasma, i.e. the lost electron energy distribution (LEED), to achieve a more comprehensive view of the plasma. The evolution of the bremsstrahlung spectra and the LEED were determined as a function of the main operating parameters of the ion source. Also, the effects of the transition from a stable to an unstable plasma regime were determined for the bremsstrahlung and LEED changes in the shape of the measured LEED were found to correlate with changing bremsstrahlung spectral temperature. It was also found that the magnetic field has a strong impact on the axial and radial bremsstrahlung spectra and the LEED affecting the bremsstrahlung intensity, spectral temperatures and the LEED high energy local maximum. A comprehensive discussion is provided to explain the observed different behaviour of axial and radial bremsstrahlung emissions with varying magnetic field based on the directionality of plasma bremsstrahlung in ECRIS specific magnetic confinement scheme. Furthermore, it was observed that the onset of kinetic plasma instabilities has a clear impact on the shape of the LEED

日本語訳

電子サイクロトロン共鳴イオン源(ECRIS)の高電荷状態プラズマの特性を研究するために、電子ビームと制動放射の診断法を組み合わせて使用した。軸方向および径方向の両方における制動放射を、閉じ込められたプラズマから軸方向に逃げる電子のエネルギー分布、すなわち損失電子エネルギー分布(LEED)と相関させ、プラズマのより包括的な理解を得た。制動放射スペクトルとLEEDの時間的変化を、イオン源の主要な動作パラメータの関数として測定した。また、安定なプラズマ状態から不安定なプラズマ状態への遷移の影響を、制動放射とLEEDの両方について調べた。測定されたLEEDの形状変化は、制動放射のスペクトル温度の変化と相関することが見出された。さらに、磁場が軸方向および径方向の制動放射スペクトルとLEEDに強い影響を及ぼし、制動放射強度、スペクトル温度、およびLEEDの高エネルギー側の極大値に影響を与えることが明らかになった。ECRIS特有の磁場閉じ込め配位におけるプラズマ制動放射の方向性に基づいて、磁場の変化に伴う軸方向と径方向の制動放射放出の異なる挙動を説明する包括的な議論が提供された。さらに、運動論的プラズマ不安定性の発生がLEEDの形状に明確な影響を及ぼすことが観測された。

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