TITLE

Plasma spectroscopy for magnetically confined fusion plasma

AUTHOR(S)
Goto, M.; Morita, S.
PUB. DATE
April 2007
SOURCE
AIP Conference Proceedings;2007, Vol. 901 Issue 1, p55
SOURCE TYPE
Conference Proceeding
DOC. TYPE
Article
ABSTRACT
An emission line of neutral helium λ667.8 nm (21P-31D) is observed with a set of line of sights which covers an entire poloidal cross section of LHD, a heliotron-type fusion experimental device. From the observed Zeeman splittings and the well-known magnetic field structure in the plasma, the emission locations on the line of sight are precisely determined. The distribution of line emissions over the observed poloidal cross section is derived from the results of all the line of sights through a tomographic analysis. Balmer series lines of neutral hydrogen are measured for the rotating radiation body in the Serpens mode [J. Miyazawa et al., Nucl. Fusion 46, 532 (2006)]. The electron temperature and density are derived from the observed spectra with the help of calculations with the collisional-radiative (CR) model. The derived electron density is confirmed with the Stark broadening of several lines from n = 7 to 16 levels, where n is the principal quantum number. We have developed a CR model code for neutral helium based on recently calculated cross section data of electron impact. Six emission lines of neutral helium for the transitions from n = 3 to n = 2 levels are measured for various discharges in LHD and an estimation of the electron temperature and density is attempted from the intensity ratios among three lines, λ667.7 nm (21P-31D), λ706.5 nm (23P-33S), and λ728.1 nm (21P-31S), out of the six lines. Intensities of other three lines, λ388.9 nm (23S-33P), λ501.6 nm (21S-31P), and λ587.6 nm (23P-33D), are calculated with the derived plasma parameters and the agreement with the measured line intensities is found satisfactory. © 2007 American Institute of Physics
ACCESSION #
24660316

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics