Laser Thomson scattering diagnostics - developments and applications to high-temperature plasmas and plasmas for industrial applications

Laser Thomson scattering was applied to plasma diagnostics almost as soon as laser was invented in 1960. The most important contribution of the technique to plasma physics and controlled fusion came from the confirmation of good confinement of plasmas in the T-3 tokamak in 1968, by a collaboration of Russian and British physicists. Since then, extensive developments of the technique have been made to meet various measurement requirements, not only in hightemperature plasmas but in plasmas for industrial applications. In this article, these developments are briefly reviewed, followed by the work of the author and its implications for understanding various plasma phenomena

Measurements of electron temperature and density of a micro-discharge plasma using laser Thomson scattering

Laser Thomson scattering was successfully applied to measure electron temperature (T-e) and electron density (n(e)) in a micro-discharge plasma. This is the first time that this method has been used to obtain otherwise inaccessible plasma information from the near vicinity (0.3 mm) of a material surface. The key of the success was the suppression of strong stray laser light by using a triple-grating spectrometer. Values of electron temperature and density were T-e = (0.4-1.6) eV and n(e) = (6-10) x 10(18) m(-3), depending on the time from the beginning of the pulsed discharge. The technique developed here is readily applicable to plasma display panel (PDP) discharges

無衝突衝撃波々面での散逸機構

磁場に直角に伝播する臨界マッハ数以下の無衝突衝撃波の波面での散逸は, イオン音波不安定により駆動された乱れと電子の相互作用によるものである, との立場から首尾一貫した説明を行なった. 乱れのスペクトルはKadomstevスペクトルの波長依存性に一致し, 強度はその1/15であること, 従ってみかけ上の電子の衝突周波数はSagdeevによる値の1/15であることを示した.1. まえがき / 2. 衝撃波幅 / 3. 乱れのスペクトル / 　3. 1. Kadomtsevスペクトル / 　3. 2. 実験 / 　3. 3. 絶対強度 / 3. 4. カットオフ波数k_eo / 　3. 5. 乱れの強度比 / 4. 検討 / 文

高周波誘導プラズマトーチ : 第1報 大気圧下での作動状態

高周波誘導プラズマトーチの発振器特性，大気圧アルゴン雰囲気中での点火特性の研究，およびそれにより得られた定常プラズマの温度測定を行なった．その結果，発振器の発振領域特性を得ておくことが有益なこと， トーチの点火はワークコイルにより誘起される最大電位傾度により決定されることがわかった．また，アルゴンの連続スペクトルの絶対強度測定により湿度を求め，最高 8,500°K程度の値が得られた．1. まえがき / 2. 実験装置 / 3. 結果と検討 / 4. 結論 / 附

Fusion Burn Control and Diagnostic Systems for ITER

Based on the various studies on the ignition characteristics, the feedback control algorithm for ignition burn has been developed for a safe operation and diagnostic integration design of ITER. A set of the diagnostic systems for core burn control are selected and a fail-safe control algorithms has been proposed to prevent the unsafe operation caused by the diagnostic failure. Some feature in the reduced cost of ITER is also presented.Based on the various studies on the ignition characteristics, the feedback control algorithm for ignition burn has been developed for a safe operation and diagnostic integration design of ITER. A set of the diagnostic systems for core burn control are selected and a fail-safe control algorithms has been proposed to prevent the unsafe operation caused by the diagnostic failure. Some feature in the reduced cost of ITER is also presented

ITERの核融合燃焼制御と計測システム

Based on the various studies on the ignition characteristics, the feedback control algorithm for ignition burn has been developed for a safe operation and diagnostic integration design of ITER. A set of the diagnostic systems for core burn control are selected and a fail-safe control algorithms has been proposed to prevent the unsafe operation caused by the diagnostic failure. Some feature in the reduced cost of ITER is also presented.Based on the various studies on the ignition characteristics, the feedback control algorithm for ignition burn has been developed for a safe operation and diagnostic integration design of ITER. A set of the diagnostic systems for core burn control are selected and a fail-safe control algorithms has been proposed to prevent the unsafe operation caused by the diagnostic failure. Some feature in the reduced cost of ITER is also presented

D-T実験における協同トムソン散乱アルファ粒子計測

The principle of measurements, present status, and various issues of collective Thomson scattering for alpha particle diagnostics using gyrotron in D-T experiments are reviewed. Particular attention is paid to the experiments at the TFTR and JET tokamaks. We further discuss the collective Thomson scattering diagnostics for alpha particle in the next generation tokamak ITER.The principle of measurements, present status, and various issues of collective Thomson scattering for alpha particle diagnostics using gyrotron in D-T experiments are reviewed. Particular attention is paid to the experiments at the TFTR and JET tokamaks. We further discuss the collective Thomson scattering diagnostics for alpha particle in the next generation tokamak ITER

Alpha Particle Diagnostics Using Collective Thomson Scattering in D-T Experiments

The principle of measurements, present status, and various issues of collective Thomson scattering for alpha particle diagnostics using gyrotron in D-T experiments are reviewed. Particular attention is paid to the experiments at the TFTR and JET tokamaks. We further discuss the collective Thomson scattering diagnostics for alpha particle in the next generation tokamak ITER.The principle of measurements, present status, and various issues of collective Thomson scattering for alpha particle diagnostics using gyrotron in D-T experiments are reviewed. Particular attention is paid to the experiments at the TFTR and JET tokamaks. We further discuss the collective Thomson scattering diagnostics for alpha particle in the next generation tokamak ITER