Optimization of soft X-ray tomography on the COMPASS tokamak
Optimization of soft X-ray tomography on the COMPASS tokamak
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 µs. 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.
403-408
Imrisek, M.
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Mlynar, J.
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Loffelmann, V.
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Weinzettl, V.
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Odstrčil, T.
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Odstrčil, Michal
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Tomes, M.
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Imrisek, M.
720eca95-fc31-49da-bef2-1261b8b246ed
Mlynar, J.
afd8c5ba-1731-44c1-8f40-6d9a5b299a5d
Loffelmann, V.
f11b6203-5f67-4e6e-8a22-a32bad1a048c
Weinzettl, V.
e235b955-efbd-45f3-8bae-52dbb7bd2fa9
Odstrčil, T.
69f6a622-d274-4c2b-a255-a41baeb40d07
Odstrčil, Michal
b297d3ec-ed42-4709-9f90-7af79d0644c7
Tomes, M.
dbb78180-e73d-4c78-8b04-414265e1a5dd
Imrisek, M., Mlynar, J., Loffelmann, V., Weinzettl, V., Odstrčil, T., Odstrčil, Michal and Tomes, M.
(2016)
Optimization of soft X-ray tomography on the COMPASS tokamak.
Nukleonika, 61 (4), .
(doi:10.1515/nuka-2016-0066).
Abstract
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 µs. 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.
Text
Optimization of soft X-ray
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e-pub ahead of print date: 26 October 2016
Venue - Dates:
NUKLEONIKA - Summer School of Plasma Diagnostics Phdiafusion - Soft X-Ray Diagnostics for Fusion Plasma, , Bezmiechowa, Poland, 2016-06-16 - 2016-06-20
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Local EPrints ID: 442366
URI: http://eprints.soton.ac.uk/id/eprint/442366
PURE UUID: dbd95db2-2eb0-48f3-94c2-75c92b512007
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Date deposited: 14 Jul 2020 16:31
Last modified: 16 Mar 2024 08:38
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Contributors
Author:
M. Imrisek
Author:
J. Mlynar
Author:
V. Loffelmann
Author:
V. Weinzettl
Author:
T. Odstrčil
Author:
Michal Odstrčil
Author:
M. Tomes
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