Enhancement of the FIDA diagnostic at ASDEX Upgrade for velocity space tomography

M. Weiland, B. Geiger, Asger Schou Jacobsen, M. Reich, Mirko Salewski, T. Odstrčil

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade are discussed. The diagnostic has been extended from three to five line of sight arrays with different angles to the magnetic field, and a spectrometer redesign allows the simultaneous measurement of red- and blue-shifted parts of the Doppler spectrum. These improvements make it possible to reconstruct the 2D fast-ion velocity distribution from the FIDA measurements by tomographic inversion under a wide range of plasma parameters. Two applications of the tomography are presented: a comparison between the distributions resulting from 60 keV and 93 keV neutral beam injection and a velocity-space resolved study of fast-ion redistribution induced by a sawtooth crash inside and outside the sawtooth inversion radius.
Original languageEnglish
Article number025012
JournalPlasma Physics and Controlled Fusion
Volume58
Issue number2
Number of pages13
ISSN0741-3335
DOIs
Publication statusPublished - 2016

Keywords

  • Tomography
  • Sawtooth
  • Crash
  • Transport
  • Doppler
  • Spectroscopy

Cite this

Weiland, M. ; Geiger, B. ; Jacobsen, Asger Schou ; Reich, M. ; Salewski, Mirko ; Odstrčil, T. / Enhancement of the FIDA diagnostic at ASDEX Upgrade for velocity space tomography. In: Plasma Physics and Controlled Fusion. 2016 ; Vol. 58, No. 2.
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Enhancement of the FIDA diagnostic at ASDEX Upgrade for velocity space tomography. / Weiland, M.; Geiger, B.; Jacobsen, Asger Schou; Reich, M.; Salewski, Mirko; Odstrčil, T.

In: Plasma Physics and Controlled Fusion, Vol. 58, No. 2, 025012, 2016.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Enhancement of the FIDA diagnostic at ASDEX Upgrade for velocity space tomography

AU - Weiland, M.

AU - Geiger, B.

AU - Jacobsen, Asger Schou

AU - Reich, M.

AU - Salewski, Mirko

AU - Odstrčil, T.

PY - 2016

Y1 - 2016

N2 - Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade are discussed. The diagnostic has been extended from three to five line of sight arrays with different angles to the magnetic field, and a spectrometer redesign allows the simultaneous measurement of red- and blue-shifted parts of the Doppler spectrum. These improvements make it possible to reconstruct the 2D fast-ion velocity distribution from the FIDA measurements by tomographic inversion under a wide range of plasma parameters. Two applications of the tomography are presented: a comparison between the distributions resulting from 60 keV and 93 keV neutral beam injection and a velocity-space resolved study of fast-ion redistribution induced by a sawtooth crash inside and outside the sawtooth inversion radius.

AB - Recent upgrades to the FIDA (fast-ion D-alpha) diagnostic at ASDEX Upgrade are discussed. The diagnostic has been extended from three to five line of sight arrays with different angles to the magnetic field, and a spectrometer redesign allows the simultaneous measurement of red- and blue-shifted parts of the Doppler spectrum. These improvements make it possible to reconstruct the 2D fast-ion velocity distribution from the FIDA measurements by tomographic inversion under a wide range of plasma parameters. Two applications of the tomography are presented: a comparison between the distributions resulting from 60 keV and 93 keV neutral beam injection and a velocity-space resolved study of fast-ion redistribution induced by a sawtooth crash inside and outside the sawtooth inversion radius.

KW - Tomography

KW - Sawtooth

KW - Crash

KW - Transport

KW - Doppler

KW - Spectroscopy

U2 - 10.1088/0741-3335/58/2/025012

DO - 10.1088/0741-3335/58/2/025012

M3 - Journal article

VL - 58

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 2

M1 - 025012

ER -