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  • Wijkamp, T. A.Technische Universiteit Eindhoven,Eindhoven University of Technology,Dutch Institute for Fundamental Energy Research (DIFFER) (författare)

Tomographic reconstruction of the runaway distribution function in TCV using multispectral synchrotron images

  • Artikel/kapitelEngelska2021

Förlag, utgivningsår, omfång ...

  • 2021-03-22
  • IOP Publishing,2021

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:234f6287-2d4a-478e-801b-1b6dd9577e43
  • https://doi.org/10.1088/1741-4326/abe8afDOI
  • https://research.chalmers.se/publication/523232URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Perek, A.Dutch Institute for Fundamental Energy Research (DIFFER) (författare)
  • Decker, J.Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL) (författare)
  • Duval, B.Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL) (författare)
  • Hoppe, Mathias,1993Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hoppe (författare)
  • Papp, G.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (författare)
  • Sheikh, U.Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL) (författare)
  • Classen, I.Dutch Institute for Fundamental Energy Research (DIFFER) (författare)
  • Jaspers, R. J.E.Technische Universiteit Eindhoven,Eindhoven University of Technology (författare)
  • Technische Universiteit EindhovenDutch Institute for Fundamental Energy Research (DIFFER) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Nuclear Fusion: IOP Publishing61:41741-43260029-5515

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