ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
The profiles are measured in the tokamak fusion test reactor (TFTR) with two bolometer arrays, one of which looks in at the plasma horizontally and one vertically. Under some conditions the profiles have large, localized features. The most common are a bright band of radiation near the inner wall (usually referred to as a "marfe'') and a wide bright layer that occurs when the plasma is in contact with the inner bumper limiter. The asymmetric profiles have been analyzed in three ways: by inspection, by separating the excess over the normal part of the profile, and by a 2-D reconstruction procedure in which the cross section is divided into zones tailored to our specific geometry. Inspection shows the motion of the bright band and its development into a bright shell. Integration of the excess yields the power in the band. This power rises smoothly and dramatically as a function of density as one nears the high-density limit. However, it needs to be taken into account in profile Abel inversion even at modest densities. The 2-D reconstruction yields, among other results, the intensity and the thickness of the inner-bumper layer. These are typically 300 kW/m3 and approximately 0.1 m. The reconstruction is not accurate enough to be used as a substitute for Abel inversion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1138745
Permalink
