The PLT rotating pumped limiter

Cohen, Samuel A.; Budny, R.; Corso, V.L.; Boychuck, J.; Grisham, L.; Heifetz, D.; Hosea, J. C.; Luyber, S.; Loprest, P.; Manos, D. M.; Mueller, D.; Mycock, W.; Post, D.; Ritter, R.; Timberlake, J.; Williams, M. D.

doi:10.1016/0022-3115(84)90389-1

Cited by 18 publications

(6 citation statements)

References 8 publications

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“…Under strong current-drive conditions, an intense, localized hot spot due to the loss of fast electrons was observed on the limiter. A study of this loss process was undertaken, culminating in the installation of a rotating graphite limiter to diffuse the heat flux over a larger limiter surface [36]. The removal of surface heat flux is expected to become more critical as longer pulse lengths and higher powers are approached.…”

Section: Lhcd Programmementioning

confidence: 99%

The Princeton Large Torus (PLT)

1985

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In the PLT experimental programme, Ohmic, neutral-injection, and ion-cyclotron heating techniques have been studied and improved, resulting in record ion temperatures. In addition, non-inductive current drive with lower-hybrid waves has been demonstrated. These achievements were made possible by the continual development and deployment of advanced plasma diagnostics, high-power RF systems, and specially tailored materials and structures. The intermediate size of PLT has permitted flexible experimental operation and the separation of plasma core from plasma surface effects.

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Section: Lhcd Programmementioning

confidence: 99%

The Princeton Large Torus (PLT)

1985

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“…Measurements were made of the flux and energy of neutral deuterium reaching the back of the pumping duct of the rotating pumped limiter on the PLT tokamak [3]. The experimental arrangement is illustrated schematically in Fig.…”

Section: Experimental Arrangementmentioning

confidence: 99%

“…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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“…Under strong current-drive conditions, an intense, localized hot spot due to the loss of fast electrons was observed on the limiter. A study of this loss process rfas undertaken, culminating in the installation of a rotating graphite limiter to diffuse the heat flux over a larger limiter surface [36]. The removal off surface heat flux is expected to become more critical as longer pulse lengths and higher powers are approached.…”

Section: Thcd Programmentioning

confidence: 99%

Experimental research on toroidal devices at PPPL: 1960-1985

1985

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The Model C Stellarator was the last and most powerful of a aeries of stellarator devices operated at Princeton during the period from 1953 to 1969. Experiments on Model C addressed the problem of anomalous plasma loss and tested major innovative concepts including the '-divertor and radio-frequency (rf) heating. This review focuses on portions of Model C work that have strongly influenced present«-day research and understanding of toroidal confinement in stellarators and tokamaks.

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The PLT rotating pumped limiter

Abstract: W-Ojn-sT PPPL-2123 ' KOTlCt PORTIONS OF THIS REPORT ARE ILLEGIBLE, it fiaTblSirSproftuced trom 5he best available copy Is permit tho broadest passible avail ability.

Cited by 18 publications

References 8 publications

The Princeton Large Torus (PLT)

The Princeton Large Torus (PLT)

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

Experimental research on toroidal devices at PPPL: 1960-1985

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