Introducing minimum Fisher regularisation tomography to AXUV and soft x-ray diagnostic systems of the COMPASS tokamak

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4738648· OSTI ID:22093967

Mlynar, J.; Weinzettl, V. ^[1]; Imrisek, M. ^[2]; Odstrcil, M. ^[1]; Havlicek, J.; Janky, F. ^[1]; Alper, B. ^[3]; Murari, A. ^[4]

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1. Institute of Plasma Physics AS CR, Association EURATOM-IPP.CR, Za Slovankou 3, CZ-182 00 Prague 8 (Czech Republic)
2. Faculty of Nuclear Sciences and Physical Engineering, CTU Prague, Association EURATOM-IPP.CR, Brehova 8, CZ-115 19 Prague 1 (Czech Republic)
3. Culham Centre for Fusion Energy, Association EURATOM-CCFE, Abingdon OX14 3DB (United Kingdom)
4. Consorzio RFX, Association EURATOM-ENEA sulla Fusione, I-35127 Padova (Italy)

The contribution focuses on plasma tomography via the minimum Fisher regularisation (MFR) algorithm applied on data from the recently commissioned tomographic diagnostics on the COMPASS tokamak. The MFR expertise is based on previous applications at Joint European Torus (JET), as exemplified in a new case study of the plasma position analyses based on JET soft x-ray (SXR) tomographic reconstruction. Subsequent application of the MFR algorithm on COMPASS data from cameras with absolute extreme ultraviolet (AXUV) photodiodes disclosed a peaked radiating region near the limiter. Moreover, its time evolution indicates transient plasma edge cooling following a radial plasma shift. In the SXR data, MFR demonstrated that a high resolution plasma positioning independent of the magnetic diagnostics would be possible provided that a proper calibration of the cameras on an x-ray source is undertaken.

• OSTI ID: 22093967
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 Euratom; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
CAMERAS
COMPASS-D TOKAMAK
CONFINEMENT
EXTREME ULTRAVIOLET RADIATION
JET TOKAMAK
LIMITERS
NUCLEAR ENGINEERING
PHOTODIODES
PLASMA
PLASMA DIAGNOSTICS
RESOLUTION
SOFT X RADIATION
THERMONUCLEAR REACTORS
TOMOGRAPHY
TRANSIENTS
X-RAY SOURCES