2-D images of deuterium emission in the Alcator C-Mod tokamak divertor

Author

Boswell, Christopher J. ; Terry, James L.

Author_Institution

Plasma Sci. & Fusion Center, MIT, Cambridge, MA, USA

Volume

30

Issue

1

fYear

2002

fDate

2/1/2002 12:00:00 AM

Firstpage

78

Lastpage

79

Abstract

Two 7-mm diameter, remote-head, visible, charge-coupled device (CCD) cameras are used on the Alcator C-Mod tokamak to generate two-dimensional emissivity profiles of deuterium line radiation (typically at Balmer α and Balmer γ) from the divertor. These emissivity profiles are obtained by reconstructing the measured brightnesses using the thin-chord approximation and assuming toroidal symmetry of the emission. The regions of the divertor with a high ratio of Balmer γ to Balmer α emission are indicative of a plasma that is recombining. These recombining regions in the divertor are seen to shift from the inner to the outer divertor as the core density in increased

Keywords

CCD image sensors; Tokamak devices; plasma density; plasma diagnostics; plasma temperature; plasma toroidal confinement; 2-D images; 3.5 mm; 7 mm; Alcator C-Mod Tokamak divertor; Balmer α lines; Balmer γ line emission; CCD cameras; D; brightnesses; core density; deuterium emission; deuterium line radiation; inner divertor; outer divertor; recombining regions; remote-head visible charge-coupled device cameras; thin-chord approximation; tomographic reconstruction; two-dimensional emissivity profiles; Charge-coupled image sensors; Deuterium; Magnetic confinement; Magnetic cores; Magnetic flux; Magnetic separation; Plasma confinement; Plasma materials processing; Tokamaks; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2002.1003932

Filename

1003932