https://doi.org/10.1051/epjconf/201920303011
Integration of an Electron Cyclotron Imaging diagnostic system on the WEST tokamak
1
CEA, IRFM, F-13108 Saint Paul-lez-Durance, France
2
Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
3
National Fusion Research Institute, Daejeon 34133, Korea
4
Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea
* Corresponding author: roland.sabot@cea.fr
Published online: 25 March 2019
An Electron Cyclotron Emission Imaging (ECEI) diagnostic system for the WEST tokamak has been developed under the UNIST-WEST collaboration. This diagnostic system is designed to overcome accessibility and thermomechanical constraints for long pulse operation. The first O-mode channel will be installed in the first trimester of 2019 to probe the low field side (LFS) of the WEST plasma. Two large metallic reflective mirrors are installed inside the duct which is being used for maintenance access. They are suspended on a rail to facilitate mirror manipulation. The ex-vessel optical system (lens, detection array, etc.) is housed in a compact optical enclosure that fits in a tight free space between the port flange and tokamak access lobby. The design emphasized reproducibility of the precise alignment between in-vessel mirrors and optical enclosure since the both elements must be removed during shutdown period for maintenance access. The overall optical system was fully tested at UNIST last year. The test results demonstrated that the imaging optics can full access at any radial position on the LFS. The 2D beam pattern measurements were consistent with the design values.
© The Authors, published by EDP Sciences, 2019
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