RF assisted Glow Discharge Condition experiment for SST-1 Tokamak

10th Asia Plasma and Fusion Association Conference

Raval, Dilip^1 ; Khan, Ziauddin^1 ; George, Siju^1 ; Dhanani, Kalpeshkumar R.^1 ; Paravastu, Yuvakiran^1 ; Semwal, Pratibha^1 ; Thankey, Prashant^1 ; Shoaib Khan, Mohammad^1 ; Kakati, Bharat^1 ; Pradhan, Subrata^1

Institute for Plasma Research, Near Indira Bridge, Bhat, Gandhinagar

382 428, India^1

关键词: Discharge conditions;    Glow discharge cleaning;    Glow discharge conditioning;    Impurity control;    Low-Z impurities;    Operating parameters;    Plasma operations;    Radiation loss;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/823/1/012064/pdf
DOI  :  10.1088/1742-6596/823/1/012064

来源: IOP

【 摘 要 】

Impurity control reduces the radiation loss from plasma and hence enhances the plasma operation. Oxygen and water vapors are the most common impurities in tokamak devices. Water vapour can be reduced with extensive baking while in order to have a significant reduction in oxygen it is necessary to use glow discharge condition (GDC). RF assisted glow discharge cleaning system will be implemented to remove low z impurities at PFC installed SST-1 vacuum vessel. A RF assisted Glow discharge conditioning is studied at laboratory to find the optimum operating parameters in a view to implement at SST-1 tokamak. Helium is used as a fuel gas in the present experiment. It is observed that the ultimate impurity level is reduced significantly below to the accepted level for plasma operation after RF assisted GDC. The experimental findings of RF assisted Glow discharge conditioning is discussed in details in this paper.