Journal article · Conference paper
Investigation of first mirror heating for the collective Thomson scattering diagnostic in ITER
Plasma Physics and Technology Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Management, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Radiation Physics, Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Radiation Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark5
Collective Thomson scattering (CTS) has the capabilities to measure phase space densities of fast ion populations in ITER resolved in configuration space, in velocity space, and in time. In the CTS system proposed for ITER, probing radiation at 60 GHz generated by two 1 MW gyrotrons is scattered in the plasma and collected by arrays of receivers.
The transmission lines from the gyrotrons to the plasma and from the plasma to the receivers contain several quasioptical mirrors among other components. These are designed to produce astigmatic beam patterns in the plasma where the beam shapes will have a direct impact on the signal strength of the diagnostic, the spatial resolution, and the robustness of probe and receiver beam overlap against density excursions.
The first mirror has a line of sight to the plasma and is thus exposed to severe neutron streaming. The present neutronics and thermomechanical modeling of a first mirror on the high field side indicates that the mirror curvature may warp due to heating. This may alter the beam quality, and therefore, thermal effects have to be accounted for during the design of the mirror.
The modeling further demonstrates that thin mirrors are superior to thick mirrors from a thermomechanical point of view. ©2008 American Institute of Physics
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2008 |
| Pages: | 10E729 |
| Proceedings: | 17. Topical Conference on High-Temperature Plasma Diagnostics |
| ISSN: | 10897623 and 00346748 |
| Types: | Journal article and Conference paper |
| DOI: | 10.1063/1.2956961 |
| ORCIDs: | Salewski, Mirko , Korsholm, Søren Bang , Lauritzen, Bent , Leipold, Frank , Michelsen, Poul , Nielsen, Stefan Kragh and Nonbøl, Erik |
