Velocity-space sensitivity and tomography of scintillator-based fast-ion loss detectors

J. Galdon-Quiroga*, M. Garcia-Munoz, Mirko Salewski, A.S. Jacobsen, L. Sanchis-Sanchez, M. Rodriguez-Ramos, J. Ayllon-Guerola, J. Garcia-Lopez, J. Gonzalez-Martin, M.C. Jimenez-Ramos, J.F. Rivero-Rodriguez, E. Viezzer

*Corresponding author for this work

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Abstract

A simple model for the instrument function of scintillator-based fast-ion loss detectors (FILD) has been developed which accounts for the orbit trajectories in the 3D detector geometry and for the scintillator response. It allows us to produce synthetic FILD signals for a direct comparison between experiments and simulations. The model uses a weight function formalism to relate the velocity-space distribution of fast-ion losses reaching the detector pinhole to the scintillator pattern obtained experimentally, which can be understood as a distortion of the velocity-space distribution due to the finite resolution of the system. The tool allows us to recover the undistorted velocity-space distribution of the absolute flux of fast-ion losses reaching the detector pinhole from an experimental measurement using tomographic inversion methods, which can reveal additional details of the velocity-space distribution of the lost ions.
Original languageEnglish
Article number105005
JournalPlasma Physics and Controlled Fusion
Volume60
Issue number10
Number of pages13
ISSN0741-3335
DOIs
Publication statusPublished - 2018

Keywords

  • Fast-ion losses
  • Velocity-space
  • Tomography
  • Tokamak

Cite this

Galdon-Quiroga, J., Garcia-Munoz, M., Salewski, M., Jacobsen, A. S., Sanchis-Sanchez, L., Rodriguez-Ramos, M., Ayllon-Guerola, J., Garcia-Lopez, J., Gonzalez-Martin, J., Jimenez-Ramos, M. C., Rivero-Rodriguez, J. F., & Viezzer, E. (2018). Velocity-space sensitivity and tomography of scintillator-based fast-ion loss detectors. Plasma Physics and Controlled Fusion, 60(10), [105005]. https://doi.org/10.1088/1361-6587/aad76e