Journal ArticleDOI
Beam emission spectroscopy as a comprehensive plasma diagnostic tool
TLDR
In this paper, the implementation and application of beam emission spectroscopy as a quantitative diagnostic tool on the Joint European Torus (JET) experiment is reviewed, where the beam attenuation, beam geometry, beam-divergence and species mix are investigated.Abstract:
A beam of injected fast atomic hydrogen presents a superb probe for hot fusion plasmas. The neutral particles experience excitation and ionization by collisions with electrons and ions as they penetrate into a plasma. The emitted characteristic line radiation is Doppler shifted and the spectral lines are split due to motional Stark fields. Measurements of wavelength, intensity and polarization of the Balmer- alpha emission reveal information about the neutral beam, such as beam attenuation, beam-geometry, beam-divergence and species mix. Local pitch angles and toroidal fields can be derived from the simultaneous measurement of the polarization pattern and the wavelength separation of the Stark multiplet. The implementation and application of beam emission spectroscopy as a quantitative diagnostic tool on the Joint European Torus (JET) experiment is reviewed.read more
Citations
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Journal ArticleDOI
Chapter 7: Diagnostics
A. J. H. Donné,A. E. Costley,Robin Barnsley,Henrik Bindslev,R. L. Boivin,Garrard Conway,R. K. Fisher,R. Giannella,H. J. Hartfuss,M. von Hellermann,E.R. Hodgson,L. C. Ingesson,Kiyoshi Itami,David Johnson,Yasunori Kawano,Takashi Kondoh,A. V. Krasilnikov,Yoshinori Kusama,Andrey Litnovsky,Ph. Lotte,P. Nielsen,Takeo Nishitani,F. Orsitto,Byron J. Peterson,G. Razdobarin,J. Sánchez,Mamiko Sasao,Tatsuo Sugie,George Vayakis,V. S. Voitsenya,K. Vukolov,Chris Walker,K. Young +32 more
TL;DR: In this paper, the authors describe the requirements for high reliability in the systems (diagnostics) that provide the measurements in the ITER environment, which is similar to those made on the present-day large tokamaks while the specification of the measurements will be more stringent.
Journal ArticleDOI
Hydrogenic fast-ion diagnostic using Balmer-alpha light
TL;DR: In this paper, the intrinsic spatial resolution of the diagnostic is ∼5 cm for 40 keV amu −1 fast ions in toroidal magnetic fusion AQ1 devices, especially in devices with neutral beam injection.
Journal ArticleDOI
Diagnostic instrumentation for microturbulence in tokamaks
TL;DR: In this paper, a review of the primary instruments that have been developed to measure fluctuating quantities associated with transport: density, n, temperature, δT, potential and magnetic field, and their correlations.
Journal ArticleDOI
Analytical approximation of cross-section effects on charge exchange spectra observed in hot fusion plasmas
TL;DR: In this article, an analytical procedure is presented which enables a fast estimate of collision-energy-dependent cross-section effects on thermal charge exchange spectra, and the model is based both on experimental evidence and numerical simulations showing that the observed charge exchange (CX) spectra are essentially Gaussian in their shape.
Journal ArticleDOI
Neutral beam stopping and emission in fusion plasmas I: deuterium beams
H. Anderson,M. von Hellermann,Ronnie Hoekstra,L. D. Horton,A. Howman,Rwt Konig,R Martin,R. E. Olson,H. P. Summers +8 more
TL;DR: In this paper, the authors present the present JET beam emission diagnostic system and the collisional radiative modelling of deuterium beam stopping and emission, which is part of the ADAS Project.
References
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Journal ArticleDOI
Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effect.
TL;DR: Polarimetry measurements of the Doppler-shifted H{sub {alpha}} emission from a neutral hydrogen beam on the PBX-M tokamak have been employed in a novel technique for obtaining {ital q}({ital r}) and magnetic field pitch-angle profiles using the Stark effect.
Journal ArticleDOI
The Recombination and Level Populations of Ions—I HYDROGEN AND HYDROGENIC IONS
Alan Burgess,Hugh P. Summers +1 more
Journal ArticleDOI
Motional Stark effect polarimetry for a current profile diagnostic in DIII‐D
TL;DR: In this article, a single point, spatially scannable, high-sensitivity polarimeter installed on DIII-D is described, with good temporal and spatial resolution.
Journal ArticleDOI
Density fluctuation measurements via beam emission spectroscopy (invited)
TL;DR: In this article, a 20-channel system has been installed on TFTR which images one of the heating neutral beams (via fiber optics) onto a set of photoconductive photodiode detectors.
Journal ArticleDOI
Visible charge exchange spectroscopy at JET
M. von Hellermann,W. Mandl,H. P. Summers,H. Weisen,A. Boileau,P.D. Morgan,H. W. Morsi,R. Koenig,M.F. Stamp,R. C. Wolf +9 more
TL;DR: In this article, the results of the JET CXRS diagnostic are reported and the effects of collision-energy-dependent CXR cross sections on observed spectra are calculated.
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