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

Volume

32

Issue

2

fYear

2004

fDate

4/1/2004 12:00:00 AM

Firstpage

519

Lastpage

524

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;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2004.828461

Filename

1308502