Title :
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
fDate :
2/1/2002 12:00:00 AM
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;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2002.1003932
