Velocity-space tomography of the fast-ion distribution function

Asger Schou Jacobsen, Mirko Salewski, Benedikt Geiger, Manuel Garcia-Munoz, William Heidbrink, Søren Bang Korsholm, Frank Leipold, Jens Madsen, Poul Michelsen, Dmitry Moseev, Stefan Kragh Nielsen, Jesper Rasmussen, Morten Stejner Pedersen, Giovanni Tardini

Research output: Contribution to journalConference abstract in journalResearchpeer-review


Fast ions play an important role in heating the plasma in a magnetic confinement fusion device. Fast-ion Dα(FIDA) spectroscopy diagnoses fast ions in small measurement volumes. Spectra measured by a FIDA diagnostic can be related to the 2D fast-ion velocity distribution function. A single FIDA view probes certain regions in velocity-space, determined by the geometry of the set-up. Exploiting this, the fast-ion distribution function can be inferred using a velocity-space tomography method. This poster contains a tomography calculated from measured spectra from three different FIDA views at ASDEX Upgrade. The quality of the tomography improves with the number of FIDA views simultaneously measuring the same volume. To investigate the potential benefits of including additional views (up to 18), tomographies are inferred from synthetic spectra calculated from a simulated distribution function. The number of experimentally available views can be increased by combining different types of diagnostics in a joint velocity-space tomography. Using this, up to 7 views are available at ASDEX Upgrade from 2014.

Original languageEnglish
JournalAmerican Physical Society. Bulletin
Issue number16
Publication statusPublished - 2013
Event55th Annual Meeting of the APS Division of Plasma Physics - Denver, United States
Duration: 11 Nov 201315 Nov 2013
Conference number: 55


Conference55th Annual Meeting of the APS Division of Plasma Physics
CountryUnited States

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