Multi-view fast-ion D-alpha spectroscopy diagnostic at ASDEX Upgrade

Journal Article · Fri Nov 15 00:00:00 EST 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4829481· OSTI ID:22220325

Geiger, B.; Dux, R.; McDermott, R. M.; Potzel, S.; Reich, M.; Ryter, F.; Weiland, M.; Wünderlich, D. ^[1]; Garcia-Munoz, M. ^[2]

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1. Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching (Germany)
2. Faculty of Physics, University of Seville, Seville (Spain)

A novel fast-ion D-alpha (FIDA) diagnostic that is based on charge exchange spectroscopy has been installed at ASDEX Upgrade. The diagnostic uses a newly developed high-photon-throughput spectrometer together with a low-noise EM-CCD camera that allow measurements with 2 ms exposure time. Absolute intensities are obtained by calibrating the system with an integrating sphere and the wavelength dependence is determined to high accuracy using a neon lamp. Additional perturbative contributions to the spectra, such as D{sub 2}-molecular lines, the Stark broadened edge D-alpha emission, and passive FIDA radiation have been identified and can be subtracted or avoided experimentally. The FIDA radiation from fast deuterium ions after charge exchange reactions can therefore be analyzed continuously without superimposed line emissions at large Doppler shifts. Radial information on the fast ions is obtained from radially distributed lines of sight. The investigation of the fast-ion velocity distribution is possible due to three different viewing geometries. The independent viewing geometries access distinct parts of the fast-ion velocity space and make tomographic reconstructions possible.

• OSTI ID: 22220325
• Journal Information: Review of Scientific Instruments, Vol. 84, Issue 11; Other Information: (c) 2013 Euratom; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
ALPHA SPECTROSCOPY
ASDEX TOKAMAK
CHARGE EXCHANGE
CHARGE-COUPLED DEVICES
CHARGE-EXCHANGE REACTIONS
DEUTERIUM IONS
DIAGNOSTIC USES
DOPPLER EFFECT
EMISSION
FREQUENCY DEPENDENCE
GEOMETRY
NEON
PHOTONS
PLASMA DIAGNOSTICS
SENSORS
SPECTROMETERS