Journal ArticleDOI
A compact thomson scattering system
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TLDR
In this paper, a multipulse Nd:YAG Thomson scattering system for measuring electron temperature and density profiles in the throat of the divertor of the Alcator C-Mod machine is presented.Abstract:
We have made and installed a multipulse Nd:YAG Thomson scattering system for measuring electron temperature and density profiles in the throat of the divertor of the Alcator C-Mod machine. The observing head is located in the vacuum vessel in a re-entrant chamber. It is optically fast and very compact. A system for providing feedback to maintain the laser beam alignment is a part of the observing head assembly. The head is designed to minimize eddy currents, and have a very rigid adjustable mounting to resist the forces generated by the eddy currents during plasma disruptions. A four wavelength polychromator using 25 element avalanche photodiode arrays for spatial resolution has been designed and built for this system. Two of these polychromators and a single observing head will provide 50 spatial resolution elements.read more
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Journal ArticleDOI
Diagnostic systems on alcator C-mod
N. P. Basse,A. Dominguez,E.M. Edlund,C.L. Fiore,Robert Granetz,Amanda Hubbard,Jerry Hughes,Ian H. Hutchinson,J. H. Irby,Brian LaBombard,L. Lin,Yu-Ming Lin,Bruce Lipschultz,J. Liptac,E. S. Marmar,D. A. Mossessian,R.R. Parker,Miklos Porkolab,J.E. Rice,J. A. Snipes,Vincent Tang,J.L. Terry,S.M. Wolfe,S.J. Wukitch,K. Zhurovich,R. V. Bravenec,P. E. Phillips,W. L. Rowan,G. J. Kramer,G. Schilling,S. D. Scott,Stewart Zweben +31 more
TL;DR: An overview of the diagnostics installed on the Alcator C-Mod tokamak is presented in this article, where several advanced and novel diagnostics contribute to the investigation of C-mod plasmas, e.g., electron cyclotron emission, phase contrast imaging, gas puff imaging, probe measurements, and active magnetohydrodynamic antennas.
Journal ArticleDOI
High-resolution edge Thomson scattering measurements on the Alcator C-Mod tokamak
TL;DR: In this paper, a Thomson scattering diagnostic is used on the Alcator C-Mod tokamak, measuring radial profiles of electron temperature and density at the plasma edge at a nominal resolution of 1.3 mm in midplane radial coordinates.
Journal ArticleDOI
Development of Thomson scattering diagnostics for the large helical device
K. Narihara,K. Yamauchi,Ichihiro Yamada,T. Minami,K. Adachi,Akira Ejiri,Y. Hamada,Katsumi Ida,H. Iguchi,Kazuo Kawahata,T. Ozaki,K. Toi +11 more
TL;DR: In this paper, an obliquely backscattered Thomson scattering system gives full profiles of electron temperature (T e ) and density (n e ) along the major radius on the midplane with a spatial resolution of 1.5−4.0 cm.
Journal ArticleDOI
The new RFX Thomson scattering system
TL;DR: In this paper, a new detection system based on filter spectrometers and avalanche photodiodes has been built to improve the accuracy and dynamic range of the Thomson scattering system at the reversed field experiment.