Title :
Measurement of a magnetic island with a tangentially viewing fast-framing CCD camera in the Large Helical Device
Author :
Shoji, M. ; Yamazaki, K. ; Komori, A. ; Yamada, H.
Author_Institution :
Nat. Inst. for Fusion Sci., Toki, Japan
fDate :
2/1/2002 12:00:00 AM
Abstract :
Reduction of magnetic islands induced by an error field is essential to achieving high-performance plasmas in helical/stellarator systems. Magnetic islands were observed in the large helical device by applying a fluorescent technique with an electron gun and a fluorescent mesh. Two stripes of impurity line emission profiles were observed with a tangentially viewing fast-framing charge coupled device (CCD) camera during the termination phase of the plasma discharge. A three-dimensional calculation of magnetic field lines on the magnetic island shows that the two stripes correspond to the magnetic islands. The images of the impurity line emission can contribute to identifying magnetic islands and the investigation of the physical mechanisms of plasma confinement in the island
Keywords :
CCD image sensors; fluorescence; photographic applications; plasma diagnostics; plasma impurities; stellarators; Large Helical Device; electron gun; fluorescent mesh; fluorescent technique; helical plasma confinement machine; helical/stellarator systems; high-performance plasmas; impurity line emission; impurity line emission profiles; magnetic field lines; magnetic islands measurement; physical mechanisms; plasma discharge; tangentially viewing fast-framing CCD camera; termination phase; three-dimensional calculation; Charge-coupled image sensors; Electrons; Fluorescence; Impurities; Magnetic confinement; Magnetic devices; Magnetic field measurement; Plasma confinement; Plasma devices; Plasma measurements;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2002.1003934
