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

doi:10.1088/0741-3335/58/2/025012

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

Max Planck Institute for Plasma Physics

Research output: Contribution to journal › Journal article › Research › peer-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 language	English
Article number	025012
Journal	Plasma Physics and Controlled Fusion
Volume	58
Issue number	2
Number of pages	13
ISSN	0741-3335
DOIs	https://doi.org/10.1088/0741-3335/58/2/025012
Publication status	Published - 2016

Keywords

Tomography
Sawtooth
Crash
Transport
Doppler
Spectroscopy

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title = "Enhancement of the FIDA diagnostic at ASDEX Upgrade for velocity space tomography",

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.",

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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

SN - 0741-3335

VL - 58

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 2

M1 - 025012

ER -

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

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Keywords

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