Experimental observation of enhanced plasma potential due to unabsorbed fast wave on EAST. (27th February 2019)

• Record Type: Journal Article
• Authors: Zhang, Xinjun; Liu, Lunan; Qin, Chengming; Lin, Y.; Ochoukov, R.; Zhao, Yanping; Jean-Marie, Noterdaeme; Wukitch, Steve; Gong, X.Z.; Wan, B.N.; Song, Y.T.; Yuan, Shuai; Yang, Hua; Mao, Yuzhou; Cheng, Yan; Wang, Lei; Deng, Xu; Chen, Gen; Ju, Songqing; Zhang, Kai; Ping, Lanlan
• Is Part Of: Nuclear fusion. Volume 59:Number 4(2019:Apr.)
• Publication Date: 2019-02-27
• Subjects: plasma potential -- fast wave -- tokamak; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/aaffad
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: An experiment on EAST is used to study the fast wave rectification by only an actively powered I-port antenna. The plasma potential up to 100 V was found in the region that does not map along the magnetic field line to active I-port antenna. This enhancement correlates with the local fast wave intensity. An increase in the loading resistance and heating efficiency was observed at a low parallel wave number. The higher heating efficiency is seen to cause lower unabsorbed fast wave power in the SOL regions. This can cause a decrease in the fast wave field intensity that reaches plasma facing components and can result in a decrease in the plasma potential and slow wave intensity.