학술논문
Comparison of ion cyclotron wall conditioning discharges in hydrogen and helium in JET
Document Type
article
Author
Y. Kovtun; T. Wauters; D. Matveev; R. Bisson; I. Jepu; S. Brezinsek; I. Coffey; E. Delabie; A. Boboc; T. Dittmar; A. Hakola; P. Jacquet; K. Kirov; E. Lerche; J. Likonen; E. Litherland-Smith; T. Loarer; P. Lomas; C. Lowry; E. Pawelec; C. Perez von Thun; A. Meigs; M. Maslov; I. Monakhov; C. Noble; S. Silburn; H. Sun; D. Taylor; E. Tsitrone; A. Widdowson; H. Sheikh; D. Douai
Source
Nuclear Materials and Energy, Vol 37, Iss , Pp 101521- (2023)
Subject
Language
English
ISSN
2352-1791
41282043
41282043
Abstract
This paper explores the plasma parameters of helium and hydrogen Ion Cyclotron Wall Conditioning (ICWC) discharges performed in JET as part of a He/H fuelling changeover experiment. The conducted study shows that plasma with a higher density is formed in helium than in hydrogen. A distinct glow in the ion cyclotron resonance zone is observed throughout the discharge in He. In H-ICWC discharges, a lower radio-frequency coupling efficiency and coupled power was observed than in He-ICWC discharges. While the helium concentration decreased with the number of H-ICWC pulses and the same for hydrogen in He-ICWC, which is the intended result of the plasma wall interaction in the ICWC changeover procedure, the main features of hydrogen as well as the helium IC discharge do not change dramatically.