Initial alt-i pump limiter studies on TEXTOR

Pontau, A.E.; Guthrie, S.E.; Malinowski, M. E.; Berkmoes, A.A. Ver; Whitley, J.B.; McDonald, J.M.; Watson, R.D.; Gauster, W.B.; Campbell, G. A.; Goebel, Dan M.; Conn, R.W.; Andrews, Kahlil J.; Dippel, K.H.; Finken, K. H.; Fuchs, Gerhard; Haas, H.

doi:10.1016/0022-3115(84)90390-8

Cited by 38 publications

(16 citation statements)

References 9 publications

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“…A quite different approach to the study and control of recycling is presented by the pump limiter experiment (ALT-I) performed on TEXTOR [17,18]. Here a reduction of the recycling coefficient for the limiter and hence a control of plasma density can be expected by collecting charged particles through an opening in the limiter surface facing the toroidal particle flux.…”

Section: Control Of Plasma-wall Interactionmentioning

confidence: 99%

Plasma performance and plasma-wall interaction in TEXTOR

Schlüter

Bhatnagar

1985

Nucl. Fusion

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The performance of the TEXTOR tokamak, as manifested by its density limit, confinement time, behaviour of density and current density profiles, and impurity level, is described. By means of ICRH heating, powers significantly above the Ohmic one are obtained. The deposition of thin carbon layers onto all inner surfaces is shown to be an effective method for achieving low impurity concentrations in the plasma. Results of a systematic study of plasma-wall interaction, with particular emphasis on a quantitative description of the particle sources and of the boundary layer, are presented. Pump limiter experiments resulting in high particle removal rates are described.

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Section: Control Of Plasma-wall Interactionmentioning

confidence: 99%

Plasma performance and plasma-wall interaction in TEXTOR

Schlüter

Bhatnagar

1985

Nucl. Fusion

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“…Spectroscopic measurements in the ALT-1 pumped limiter have detected energetic neutral hydrogen entering the pumping duct [4]. In this paper we present the first quantitative measurements of the flux and energy of the energetic neutrals inside the pumping duct of a pumped limiter.…”

Section: Introductionmentioning

confidence: 96%

“…Improved control over the plasma density requires a method of removing particles from the plasma. Pumped limiters have been proposed to provide this controlled particle removal and are now being tested on several large tokamaks [1][2][3][4][5]. Pumped limiters divert particles from the plasma boundary into a region where they can be collected by a pump.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these ions are promptly reflected, predominantly as energetic neutral atoms, while others lose their energy inside the material and are eventually released as molecular hydrogen. In previous studies of pumped limiters [1][2][3][4][5] the particle removal rates have been deduced from measurements of the gas pressure in the pumping duct behind the limiter. Such measurements do not distinguish whether the particles in the duct entered as molecules or energetic neutrals.…”

Section: Introductionmentioning

confidence: 99%

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On the solubility of a certain class of non-coercive boundary-value problems

Paneyakh¹

1985

Russ. Math. Surv.

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A carbon film resistance probe was used to measure the energy and flux of energetic neutral deuterium in the pumping duct of the pumped limiter on the PLT tokamak. The particle flux at the back of the pumping duct increased from about 10 12 to 4 X 10 13 cnT'-s"" 1 as the limiter was moved into the plasma edge. With the limiter in the plasma edge, the mean particle energy measured at the back of the pumping duct was 160-300 eV. Gas pressures in the pumping duct up to about 1 mtorr were measured but were found to have little effect on the energetic neutrals reaching the back of the pumping duct. Particle transport calculations indicate that pressures more than an order of magnitude higher than observed would be necessary to stop the particles. The measured flux of energetic neutrals is estimated to be large enough to contribute significantly to the particle removal rate achieved by the pumped limiter. RESISTANCE / PROBE \^^^^»EFLECTED NEUTRALS FIG. 1. Schematic illustration of the PL T pumped limiter.

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“…It is estimated to be 30-50? for the ALT-I pumped limiter [4], and should be less for Tore Supra since presumably the throats will be deeper and the electron temperature will be higher. This loss is assumed to be 25J in the following.…”

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confidence: 99%

Scrape-off profiles and effects of limiter pumping in Tore Supra

Budny¹

1986

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A one-dimensional plasma scrape-off model was used to simulate Tore Supra discharges which are limited by various combinations of the pumped and inner limiters. Scrape-off profiles of the electron density and temparature, ion temperature, and neutral density are given. For each case, various fractions of the ion flux to the neutralizers were assumed to be pumped. Modifications of the scrape-off profiles caused by pumping are predicted. Pumping efficiencies are calculated including the effects of flux amplification caused by recycling. The pumping efficiency is estimated to be 8? for low-power discharges formed on the outer pumped limiter, 7.5? for intermediate-pot'er discharges formed on the seven-module pumped-limiter system, and 58 for fullpower discharges formed on both the inner limiter and the pumped-limiter system. The maximum particle removal rate is estimated to be 150 Tl/s.

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Initial alt-i pump limiter studies on TEXTOR

Cited by 38 publications

References 9 publications

Plasma performance and plasma-wall interaction in TEXTOR

Plasma performance and plasma-wall interaction in TEXTOR

On the solubility of a certain class of non-coercive boundary-value problems

Scrape-off profiles and effects of limiter pumping in Tore Supra

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