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Towards model-based control of divertor detachment

, 2021
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The Role of “Momentum Removal” in Divertor Detachment

Contributions To Plasma Physics, 2016
AbstractThe role of “momentum removal” (the drag force on the plasma ion flow) in divertor detachment is considered and analysed in detail. This analysis of the 2D modelling results shows that the drag force cannot reduce the power and particle flux to the target directly. However, it is essential for creating the conditions for efficient radiation and
A. S. Kukushkin, H. D. Pacher
exaly   +2 more sources

Routes to divertor detachment in ASDEX Upgrade

Journal of Nuclear Materials, 1997
Abstract A simple analytic model of divertor radiation is used as a framework for identifying different routes to divertor detachment. Three means of achieving detachment are demonstrated experimentally including, increasing plasma density, purposely increasing the impurity level and increasing the scrape-off layer connection length.
Pitcher, C., Carlson, A., Fuchs, C., Herrmann, A., Suttrop, W., Schweinzer, J., Weinlich, M.   +6 more
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Plasma recombination and divertor detachment

Physics Letters A, 1996
AbstractWe consider the influence on plasma recombination of the formation of negative and molecular ions in divertor plasma. We take into account different atomic processes (vibrational excitation of molecular hydrogen, electron dissociative attachment, ion conversion, charge exchange and dissociative recombinations, dissociation and ionization, etc.)
S. I. Krasheninnikov, A. Yu. Pigarov, D. J. Sigmar   +2 more
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Divertor plasma detachment

Physics of Plasmas, 2016
Regime with the plasma detached from the divertor targets (detached divertor regime) is a natural continuation of the high recycling conditions to higher density and stronger impurity radiation loss. Both the theoretical considerations and experimental data show clearly that the increase of the impurity radiation loss and volumetric plasma ...
S. I. Krasheninnikov, A. S. Kukushkin, A. A. Pshenov   +2 more
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Partially detached radiative divertor with active divertor pumping

Nuclear Fusion, 1997
Deuterium fuelled radiative diverters, operating in the partially detached divertor (PDD) regime, are effective in reducing the heat load on the divertor target. These PDD discharges are shown to be compatible with active particle exhaust conditions-an important issue for ITER type operation.
T.W Petrie, R Maingi, S.L Allen, D.A Buchenauer, D.N Hill, C.J Lasnier   +5 more
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On the way to divertor detachment in the W7-AS stellarator

Journal of Nuclear Materials, 2001
Abstract 3D modeling on W7-AS suggests that to obtain divertor plasma detachment, upstream separatrix densities nes in the range of 10 20 m −3 will be necessary. This paper investigates the ratio of nes to the line-averaged density n e under a variety of conditions – P heat ∼0.4–2 MW , n e
McCormick, K., Grigull, P., König, R., Burhenn, R., Ehmler, H., Feng, Y., Fiedler, S., Giannone, L., Hildebrandt, D., Knauer, J., Kühner, G., Naujoks, D., Sallander, J., Wendland, C.   +13 more
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Characteristics of divertor detachment for ITER conditions

Journal of Nuclear Materials, 2015
Abstract The relative role of particle balance vs. momentum balance in the phenomenon of divertor plasma detachment in tokamaks is re-assessed. Ion removal from the plasma flow by volumetric recombination and/or cross-field transport is identified as the key element in the formation of the rollover of the ion saturation current on the targets ...
A.S. Kukushkin, H.D. Pacher, R.A. Pitts
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