Retarding field analyzer for the EAST plasma boundary

A novel bi-directional Retarding Field Analyzer(RFA) probe has been installed on a fast reciprocating drive system on the Experimental Advanced SuperconductingTokamak (EAST) tomeasure the iontemperature and fast electron fluxes. ALangmuir probe assembly was added on the top of theRFA head to control theRFA position relative to the last closed flux surface and to have a possibility tomeasure the electron density andtemperature as well. Except the iontemperature, the fast electron fluxes from both ion and electron drift sides have beenmeasured during lower hybrid current drive. TheRFA probe has been also used tomeasure the fast electrons associated withedge localized modes(ELMs), indicating their substantial presence in the scrape-off-layerplasma of EAST.

Source: Review of Scientific Instruments - December 8, 2016 Category: Physics Authors: Y. L. Li, G. S. Xu, C. Xiao, H. Q. Wang, N. Yan, B. N. Wan, L. Chen, Y. L. Liu, H. Zhang, W. Zhang, L. Wang, G. H. Hu, R. Chen, J. C. Xu, Y. Ye and J. Li Source Type: research