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Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas

Den Hartog, D. J. and Ambuel, J. R. and Borchardt, M. T. and Caspary, K. J. and Den Hartog, E. A. and Falkowski, A. F. and Harris, W. S. and Ko, J. and Pablant, N. A. and Reusch, J. A. and Robl, P. E. and Stephens, H. D. and Summers, H. P. and Yang, Y. M. (2011) Advances in time-resolved measurement of magnetic field and electron temperature in low-magnetic-field plasmas. Fusion Science and Technology, 59 (11). pp. 124-127. ISSN 1536-1055

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Abstract

Internal time-resolved measurement of magnetic field and electron temperature in low-field ( 1 T) plasmas is a difficult diagnostic challenge. To meet this diagnostic challenge in the Madison Symmetric Torus reversed-field pinch, two techniques are being developed: 1) spectral motional Stark effect (MSE) and 2) Fast Thomson scattering. For spectral MSE, the entire Stark-split H spectrum emitted by hydrogen neutral beam atoms is recorded and analyzed using a newly refined atomic emission model. A new analysis scheme has been developed to infer both the polarization direction and the magnitude of Stark splitting, from which both the direction and magnitude of the local magnetic field can be derived. For Fast Thomson scattering, two standard commercial flashlamp-pumped Nd:YAG lasers have been upgraded to “pulse-burst” capability. Each laser produces a burst of up to fifteen pulses at repetition rates 1–12.5 kHz, thus enabling recording of the dynamic evolution of the electron temperature profile and electron temperature fluctuations. To further these capabilities, a custom pulse-burst laser system is now being commissioned. This new laser is designed to produce a burst of laser pulses at repetition frequencies 5–250 kHz.

Item type: Article
ID code: 31226
Notes: 8th International Conference on Open Magnetic Systems for Plasma Confinement (OS2010), Novosibirsk, RUSSIA, JUL 05-09, 2010
Keywords: magnetic field , electron temperature , laser pulses , time-resolved measurement, Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 18 May 2011 16:10
Last modified: 12 Mar 2012 11:27
URI: http://strathprints.strath.ac.uk/id/eprint/31226

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