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Tomographic reconst...
Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images
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- Wijkamp, T. A. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology,Dutch Institute for Fundamental Energy Research (DIFFER)
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- Perek, A. (författare)
- Dutch Institute for Fundamental Energy Research (DIFFER)
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- Decker, J. (författare)
- Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
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- Duval, B. (författare)
- Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
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- Hoppe, Mathias, 1993 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Papp, G. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Sheikh, U. (författare)
- Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
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- Classen, I. (författare)
- Dutch Institute for Fundamental Energy Research (DIFFER)
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- Jaspers, R. J.E. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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(creator_code:org_t)
- 2021-03-22
- 2021
- Engelska.
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 61:4
- Relaterad länk:
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https://pure.tue.nl/...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Synchrotron radiation observed in a quiescent Tokamak Configuration Variable (TCV) runaway discharge is studied using filtered camera images targeting three distinct wavelength intervals. Through the tomographic simultaneous algebraic reconstruction technique (SART) procedure the high momentum, high pitch angle part of the spatial and momentum distribution of these relativistic particles is reconstructed. Experimental estimates of the distribution are important for verification and refinement of formation-, decay- and transport-models underlying runaway avoidance and mitigation strategy design. Using a test distribution it is demonstrated that the inversion procedure provides estimates accurate to within a few tens of percent in the region of phase-space contributing most to the synchrotron image. We find that combining images filtered around different parts of the emission spectrum widens the probed part of momentum-space and reduces reconstruction errors. Next, the SART algorithm is used to obtain information on the spatiotemporal runaway momentum distribution in a selected TCV discharge. The momentum distribution is found to relax towards an avalanche-like exponentially decaying profile. Anomalously high pitch angles and a radial profile increasing towards the edge are found for the most strongly emitting particles in the distribution.Pitch angle scattering by toroidal magnetic field ripple is consistent with this picture. An alternative explanation is the presence of high frequency instabilities in combination with the formation of a runaway shell at the edge of the plasma.
Ämnesord
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
- NATURVETENSKAP -- Data- och informationsvetenskap -- Datorseende och robotik (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Computer Vision and Robotics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- tokamak
- 2D spectroscopy
- tomographic inversion
- TCV
- synchrotron radiation
- runaway electrons
- SOFT
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
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Wijkamp, T. A.
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Perek, A.
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Decker, J.
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Duval, B.
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Hoppe, Mathias, ...
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Papp, G.
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visa fler...
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Sheikh, U.
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Classen, I.
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Jaspers, R. J.E.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Matematik
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och Sannolikhetsteor ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Data och informa ...
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och Datorseende och ...
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Fusion plasma oc ...
- Artiklar i publikationen
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Nuclear Fusion
- Av lärosätet
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Chalmers tekniska högskola