High resolution Thomson scattering on the COMPASS tokamak - extending edge plasma view and increasing repetition rate

0489514 - ÚFP 2019 RIV GB eng J - Journal Article
Bílková, Petra - Böhm, Petr - Aftanas, Milan - Šos, Miroslav - Havránek, Aleš - Šesták, David - Weinzettl, Vladimír - Hron, Martin - Pánek, Radomír
High resolution Thomson scattering on the COMPASS tokamak - extending edge plasma view and increasing repetition rate.
Journal of Instrumentation. Roč. 13, č. 1 (2018), č. článku C01024. ISSN 1748-0221. E-ISSN 1748-0221.
[International Symposium on Laser-Aided Plasma Diagnostics (LAPD2017) /18./. Prague, 24.09.2017-28.09.2017]
R&D Projects: GA ČR(CZ) GA14-35260S; GA MŠMT(CZ) 8D15001; GA MŠMT(CZ) LM2015045
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : Plasma diagnostics - interferometry * spectroscopy and imaging * Trigger concepts and systems (hardware and software)
OECD category: 2.11 Other engineering and technologies
Impact factor: 1.366, year: 2018
http://iopscience.iop.org/article/10.1088/1748-0221/13/01/C01024/meta

The Thomson scattering (TS) diagnostic system on the COMPASS tokamak consists of separate collection optics for core and edge plasmas. Till now, the adverse orientation of the viewport available for the edge TS limited the investigated plasma scenarios to those, where H-mode plasma pedestal was possible to be observed. The vacuum vessel port has been recently modified and directed more to the plasma edge. To bridge the time for designing and manufacturing a new lens, the so far used edge TS collection lens was tilted and the fibre bundles rearranged to comply with the new geometry. However, the full potential of the new port is utilized only by the newly designed and manufactured lens. Comparison of performance of the collection lenses before and after the viewport modification is presented. Apart from the edge collection system upgrade, the laser system was extended by two lasers with parameters similar to the original two, thus increasing the repetition rate of the TS system to 120 Hz or allowing to obtain four profiles with tight timing in order to measure fast transient events in the plasma.
Permanent Link: http://hdl.handle.net/11104/0283917