Bolometric imaging of detached plasmas in LHD
Abstract
Detached plasmas can increase the radiated power fraction and thereby reduce the heat load on divertor tiles, which is important for steady-state fusion reactor operation. In LHD, divertor detachment is achieved through several means including gas puffing and the application of an m/n = 1/1 magnetic island using external perturbation coils. A recently upgraded imaging bolometer with a tangential view provides unique images of the plasma radiation, which give essential information about the source, three-dimensional (3-D) structure and dynamics of the radiation belt in the edge region. When compared to the results of edge modelling (EMC3/EIRENE) they can verify the model assumptions and identify the radial location of the radiation region, which is important because it impacts the compatibility between heat load and core plasma confinement and is dependent on impurity transport and magnetic topological effects on energy transport which are included in the 3-D edge model.
- Publication:
-
Journal of Nuclear Materials
- Pub Date:
- August 2011
- DOI:
- 10.1016/j.jnucmat.2011.01.047
- Bibcode:
- 2011JNuM..415S1147P