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Effects of magnetic field and target plasma on the penetration behaviour of compact toroid plasma by heat load measurements in CPD

R. Bhattacharyay, H. Zushi, N. Fukumoto, M. Nagata, N. Nishino, H. Honma, K. Kawakami, N. Yoshida, S. Kawasaki, T. Yoshinaga2008年Nuclear FusionIF 3出版社

Compact toroid (CT) injection experiments have recently been carried out in a compact plasma wall interaction experimental device (CPD) in the presence of toroidal as well as poloidal magnetic field and low density RF target plasma. Spectroscopic studies have been carried out using an IR camera, an IR spectrometer and an Hα monitor to estimate the heat load deposition on the target and also to study the magnetic field as well as RF target plasma effects on CT plasma penetration behaviour. Using IR camera imaging of the target plate, heat load deposition on it has been estimated from the observed temperature rise of the plate and has been compared with the energy content of CT plasma. The estimation suggests that nearly 700 J of energy is uniformly deposited on the target plate under vacuum condition without any magnetic field. On the other hand, post exposure analysis of target plate using scanning electron microscopy has indicated local melting of the target plate. It has been observed that radial penetration of CT towards the target plate is reduced with the increase in the external magnetic field, both toroidal and poloidal. Moreover, the presence of RF target plasma in external magnetic fields seems to change the CT penetration behaviour significantly.

日本語訳

コンパクトトーラス(CT)入射実験が、トロイダル磁場およびポロイダル磁場の存在下、ならびに低密度RFターゲットプラズマ中で、コンパクトプラズマ壁相互作用実験装置(CPD)において最近実施された。分光学的研究は、IRカメラ、IR分光計、およびHαモニターを用いて行われ、ターゲットへの熱負荷を評価し、またCTプラズマの侵入挙動に対する磁場およびRFターゲットプラズマの影響を研究した。IRカメラによるターゲット板の撮像を用いて、観測された板の温度上昇から熱負荷を評価し、CTプラズマのエネルギー含有量と比較した。この評価により、磁場を印加しない真空条件下では、約700Jのエネルギーがターゲット板に均一に堆積することが示唆された。一方、走査型電子顕微鏡を用いたターゲット板の曝露後分析により、局所的な溶融が示された。外部磁場(トロイダルおよびポロイダルの両方)を増加させると、ターゲットに向かうCTの径方向侵入が減少することが観察された。さらに、外部磁場中のRFターゲットプラズマの存在は、CTの侵入挙動を有意に変化させるように見える。

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