Number of the records: 1
Optimization of soft X-ray tomography on the COMPASS tokamak
- 1.
SYSNO ASEP 0464277 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Optimization of soft X-ray tomography on the COMPASS tokamak Author(s) Imríšek, Martin (UFP-V) RID
Mlynář, Jan (UFP-V) RID
Löffelmann, Viktor (UFP-V)
Weinzettl, Vladimír (UFP-V) RID, ORCID
Odstrčil, T. (DE)
Odstrčil, M. (GB)
Tomeš, Matěj (UFP-V)Source Title Nukleonika. - : Sciendo - ISSN 0029-5922
Roč. 61, č. 4 (2016), s. 403-408Number of pages 6 s. Publication form Print - P Action Summer School of Plasma Diagnostics PhDiaFusion 2015: “Soft X-ray Diagnostics for Fusion Plasma” Event date 16.06.2015 - 20.06.2015 VEvent location Bezmiechowa Country PL - Poland Event type EUR Language eng - English Country PL - Poland Keywords soft X-ray ; tomography ; Tikhonov regularization ; tokamak Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LM2011021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LG14002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000387150200002 EID SCOPUS 84995505899 DOI 10.1515/nuka-2016-0066 Annotation The COMPASS tokamak is equipped with the soft X-ray (SXR) diagnostic system based on silicon photodiode arrays shielded by a thin beryllium foil. The diagnostic is composed of two pinhole cameras having 35 channels each and one vertical pinhole camera with 20 channels, which was installed recently to improve tomographic inversions. Lines of sight of the SXR detectors cover almost complete poloidal cross section of the COMPASS vessel with a spatial resolution of 1–2 cm and temporal resolution of about 3 micro s. Local emissivity is reconstructed via Tikhonov regularization constrained by minimum Fisher information that provides
reliable and robust solution despite limited number of projections and ill-conditionality of this task. Improved border conditions and numerical differentiation matrices suppressing artifacts in reconstructed radiation were implemented in the code. Furthermore, a fast algorithm eliminating iterative processes was developed, and it is foreseen to be tested in real-time plasma control.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
Number of the records: 1