Title :
Production of hot spot on a vertically installed divertor plate by ICRF heating in the large helical device
Author :
Shoji, Mamoru ; Watanabe, Toshio
Author_Institution :
Nat. Inst. for Fusion Sci., Japan
fDate :
4/1/2005 12:00:00 AM
Abstract :
Plasma-wall interaction in long-pulse plasma discharges is an important issue for optimizing the first wall materials and divertor configurations for future nuclear fusion reactors. A visible charge coupled device (CCD) camera observed a hot spot on a vertically installed divertor plate in a long pulse discharge heated by ion cyclotron range of frequency (ICRF) in the large helical device (LHD). Two bright thin lines also appeared on a divertor leg. The analyses of the three-dimensional trajectory of protons accelerated by ICRF waves on two ion cyclotron resonance (ICR) layers in the plasma periphery can explain the observation of the CCD camera.
Keywords :
discharges (electric); fusion reactor divertors; plasma production; plasma radiofrequency heating; plasma toroidal confinement; plasma waves; plasma-wall interactions; stellarators; CCD camera; ICR layers; ICRF heating; ICRF waves; LHD; Large Helical Device; divertor leg; first wall materials; hot spot production; ion cyclotron range of frequency; ion cyclotron resonance layers; long-pulse plasma discharges; nuclear fusion reactors; plasma periphery; plasma-wall interaction; proton acceleration; three-dimensional proton trajectory; vertically installed divertor plane; visible charge coupled device camera; Charge coupled devices; Charge-coupled image sensors; Cyclotrons; Frequency; Fusion reactors; Heating; Inductors; Plasma devices; Plasma materials processing; Production; Charge coupled device (CCD); divertor plate; hot spot; ion cyclotron range of frequency (ICRF) heating; large helical device (LHD);
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2005.845060
