Measurement of the Electron Temperature by Thomson Scattering in Tokamak T3

Peacock, N J; Robinson, D.C.; Forrest, M.; Wilcock, P.; Sannikov, V. V.

doi:10.1038/224488a0

Cited by 244 publications

(112 citation statements)

References 2 publications

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“…The theory of Thomson scattering is well developed because of the wide use of the method in high temperature, high density plasmas [37,38]. In low density plasmas, the method can prove expensive as it demands the use of a triple grating monochromator for the subtraction of stray light and the Rayleigh scattering component.…”

Section: Thomson Scatteringmentioning

confidence: 99%

Electron density measurement in atmospheric pressure plasma jets: Stark broadening of hydrogenated and non-hydrogenated lines

Nikiforov

Leys

González

et al. 2015

Plasma Sources Sci. Technol.

181

177

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Electron density is one of the key parameters in the physics of a gas discharge. In this contribution the application of the Stark broadening method to determine the electron density in low temperature atmospheric pressure plasma jets is discussed. An overview of the available theoretical Stark broadening calculations of hydrogenated and non-hydrogenated atomic lines is presented. The difficulty in the evaluation of the fine structure splitting of lines, which is important at low electron density, is analysed and recommendations on the applicability of the method for low ionization degree plasmas are given. Different emission line broadening mechanisms under atmospheric pressure conditions are discussed and an experimental line profile fitting procedure for the determination of the Stark broadening contribution is suggested. Available experimental data is carefully analysed for the Stark broadening of lines in plasma jets excited over a wide range of frequencies from dc to MW and pulsed mode. Finally, recommendations are given concerning the application of the Stark broadening technique for the estimation of the electron density under typical conditions of plasma jets.

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Section: Thomson Scatteringmentioning

confidence: 99%

Electron density measurement in atmospheric pressure plasma jets: Stark broadening of hydrogenated and non-hydrogenated lines

Nikiforov

Leys

González

et al. 2015

Plasma Sources Sci. Technol.

181

177

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“…(January 2001) (≈1 keV and ≈ 3×10 19 m −3 ) [71,72]. These plasmas were cleaner and with low-Z elements fully stripped in the core but still had unacceptable levels of carbon, oxygen and metallic impurities.…”

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confidence: 99%

Plasma-material interactions in current tokamaks and their implications for next step fusion reactors

et al. 2001

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The major increase in discharge duration and plasma energy in a next step DT fusion reactor will give rise to important plasma-material effects that will critically influence its operation, safety and performance. Erosion will increase to a scale of several centimetres from being barely measurable at a micron scale in today's tokamaks. Tritium co-deposited with carbon will strongly affect the operation of machines with carbon plasma facing components. Controlling plasma-wall interactions is critical to achieving high performance in present day tokamaks, and this is likely to continue to be the case in the approach to practical fusion reactors. Recognition of the important consequences of these phenomena stimulated an internationally co-ordinated effort in the field of plasma-surface interactions supporting the Engineering Design Activities of the International Thermonuclear Experimental Reactor project (ITER), and significant progress has been made in better understanding these issues. The paper reviews the underlying physical processes and the existing experimental database of plasma-material interactions both in tokamaks and laboratory simulation facilities for conditions of direct relevance to next step fusion reactors. Two main topical groups of interaction are considered: (i) erosion/redeposition from plasma sputtering and disruptions, including dust and flake generation and (ii) tritium retention and removal. The use of modelling tools to interpret the experimental results and make projections for conditions expected in future devices is explained. Outstanding technical issues and specific recommendations on potential R&D avenues for their resolution are presented.

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“…This discrepancy is clearly aggravated by both the classical (C) and classical~anornaious (D, E, F) models of impurity transport. The computed profiles hi=iv:e a closer resemblance to the T-3 results [10] and to "Type--:-B" discharges ln ORMAK In all cases the current and temperature profiles are quite narrow. Since ·the impurity density profiles differ substantially, we conclude that the temperature and current profiles are determined by a variety of other ef-.…”

Section: Impurity Transport Computationsmentioning

confidence: 62%