Title :
Electron density profile measurements on LHD
Author :
Kawahata, K. ; Tanaka, K. ; Tokuzawa, T. ; Ito, Y. ; Akiyama, T. ; Sanin, A. ; Okajima, S. ; Tsuji-Iio, S. ; Vyacheslavov, L.
Author_Institution :
Nat. Inst. for Fusion Sci., Toki, Japan
fDate :
4/1/2004 12:00:00 AM
Abstract :
Several kinds of density diagnostics have been developed and routinely operated to provide density profile information on the Large Helical Device. A 13-channel far-infrared laser interferometer and a two-color millimeter-wave interferometer are used for monitoring the density profile. A CO2 laser imaging interferometer has been developed for detailed profiled measurements of density and density fluctuations. A CO2 laser densitometer measuring the Faraday rotation was developed for the long-pulse operations of large helical device. Details of each diagnostics and sample results are presented.
Keywords :
Tokamak devices; plasma density; plasma diagnostics; plasma fluctuations; plasma toroidal confinement; stellarators; 13-channel far-infrared laser interferometer; CO2; CO2 laser densitometer; CO2 laser imaging interferometer; Faraday rotation; LHD; Large Helical Device; density diagnostics; density fluctuations measurement; density profile information; electron density profile measurements; long-pulse operations; two-color millimeter-wave interferometer; Density measurement; Electrons; Finite impulse response filter; Optical imaging; Optical interferometry; Plasma density; Plasma diagnostics; Plasma measurements; Plasma temperature; Pump lasers; Helical plasma; interferometer; plasma; plasma diagnostics; polarimeter;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2004.828461
