Open AccessJournal Article
Measurements of the Internal Magnetic Field on DIII-D Using Intensity and Spacing of the Motional Stark Multiplet
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TLDR
In this paper, a motional Stark effect (MSE) diagnostic based on the relative line intensities and spacing of Stark split D(alpha) emission from the neutral beams is described.Abstract:
We describe a version of a motional Stark effect (MSE) diagnostic based on the relative line intensities and spacing of Stark split D(alpha) emission from the neutral beams. This system, named B-Stark, has been recently installed on the DIII-D tokamak. To find the magnetic pitch angle, we use the ratio of the intensities of the pi(3) and sigma(1) lines. These lines originate from the same upper level and so are not dependent on the level populations. In future devices, such as ITER, this technique may have advantages over diagnostics based on MSE polarimetry. We have done an optimization of the viewing direction for the available ports on DIII-D to choose the installation location. With this placement, we have a near optimal viewing angle of 59.6 degrees from the vertical direction. All hardware has been installed for one chord, and we have been routinely taking data since January 2007. We fit the spectra using a simple Stark model in which the upper level populations of the D(alpha) transition are treated as free variables. The magnitude and direction of the magnetic field obtained using this diagnostic technique compare well with measurements from MSE polarimetry and EFIT.read more
Citations
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Journal ArticleDOI
Active spectroscopic measurements of the bulk deuterium properties in the DIII-D tokamak (invited).
Brian Grierson,K. H. Burrell,Colin Chrystal,R. J. Groebner,D. H. Kaplan,William Heidbrink,J. M. Muñoz Burgos,N. A. Pablant,W. M. Solomon,M. A. Van Zeeland +9 more
TL;DR: The neutral-beam induced D(α) emission spectrum contains a wealth of information such as deuterium ion temperature, toroidal rotation, density, beam emission intensity, beam neutral density, and local magnetic field strength magnitude from the Stark-split beam emission spectrum.
Journal ArticleDOI
Consistency of atomic data for the interpretation of beam emission spectra
E. Delabie,M. Brix,C. Giroud,Roger Jaspers,O. Marchuk,M. G. O'Mullane,Yu. Ralchenko,Elizabeth Surrey,M. von Hellermann,K.-D. Zastrow,Jet-Efda Contributors +10 more
TL;DR: In this article, the authors compared the collisional-radiative (CR) models for the neutral beam (NB) and found good agreement between the different CR models for NB, if corrections to the fundamental cross sections are taken into account.
Journal ArticleDOI
Deuterium velocity and temperature measurements on the DIII-D tokamak.
TL;DR: Newly installed diagnostic capabilities on the DIII-D tokamak enable the measurement of main ion (deuterium) velocity and temperature by charge exchange recombination spectroscopy.
Journal ArticleDOI
Active and passive spectroscopic imaging in the DIII-D tokamak
M. A. Van Zeeland,J.H. Yu,N.H. Brooks,W. W. Heidbrink,K. H. Burrell,R. J. Groebner,A.W. Hyatt,T.C. Luce,N. A. Pablant,W. M. Solomon,M. R. Wade +10 more
TL;DR: In this article, wide-angle, 2D imaging of Doppler-shifted, Balmer alpha (Dα) emission from high energy injected neutrals, charge exchange recombination (CER) emissions from neutral beam interaction with thermal ions and fully stripped impurity ions and visible bremsstrahlung (VB) from the core of DIII-D plasmas has been carried out.
References
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