Peter Eckhard Grigull

Divertor operation in W7-AS

Peter Eckhard Grigull, Johann Kißlinger, Kent McCormick, Ralf König et autres

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Boundary/Divertor Diagnostics

Peter Eckhard Grigull, R. König, Juergen Baldzuhn, H. Ehmler et autres

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Recycling and impurity retention in high-density, improved confinement plasmas in W7-AS

Yu Feng, Francesco Sardei, Peter Eckhard Grigull, Friedrich Wagner et autres

In contrast to pre-divertor limiter operation, the island divertor in W7-AS enabled plasma density control even in the presence of a strong NBI-source, showing a significant improvement of the recycling conditions. Impurity radiation could be kept within the island SOL to enable …

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Comparative divertor-transport study for helical devices

Y. Feng, M. Kobayashi, Francesco Sardei, S. Masuzaki et autres

Using the island divertors (IDs) of W7-AS and W7-X and the helical divertor (HD) of LHD as examples, the paper presents a comparative divertor transport study for three typical helical devices of different machine sizes following two distinct divertor concepts, aiming at …

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Major results from the stellarator Wendelstein 7-AS

M. Hirsch, Juergen Baldzuhn, C. D. Beidler, Rudolf BRAKEL et autres

Major results from the stellarator Wendelstein 7-AS, Hirsch, M, Baldzuhn, J, Beidler, C, Brakel, R, Burhenn, R, Dinklage, A, Ehmler, H, Endler, M, Erckmann, V, Feng, Y, Geiger, J, Giannone, L, Grieger, G, Grigull, P, Hartfuß, H-J, Hartmann, D, Jaenicke, R, König, …

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Fabrication and testing of W7-X pre-series target elements

Jean Boscary, B. Böswirth, H. Greuner, Peter Eckhard Grigull et autres

Author: Boscary, J. et al.; Genre: Journal Article; Issued: 2007; Open Access; Keywords: 11th International Workshop on Plasma-Facing Materials and Components for Fusion Applications (PFMC-11), Greifswald, 2006-10-10 to 2006-10-12; Title: Fabrication and testing of W7-X pre-series target elements

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Numerical study on CX-neutral transport and wall-sputtering in W7-AS diverted plasmas

Y. Feng, Francesco Sardei, Peter Eckhard Grigull, Kent McCormick et autres

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Carbon influx from the island divertor of the Wendelstein-7AS stellarator

U. Wenzel, Henning Thomsen, Peter Eckhard Grigull

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A new edge-based energy scaling law for W7-AS and its implications for boundary-island divertor operation

Kent McCormick, Peter Eckhard Grigull, H. Ehmler, Ekkehard Pasch

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Non-axisymmetric SOL-transport study for tokamaks and stellarators

Francesco Sardei, Y. Feng, Johann Kißlinger, Peter Eckhard Grigull et autres

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Physics of Island Divertor Plasmas in Stellarators

Y. Feng, Francesco Sardei, Peter Eckhard Grigull, Kent McCormick et autres

Using the W7-AS island divertor as a guideline, the paper presents a physics-analysis of the plasma, neutral and impurity transport in the island divertor, aimed at showing the basic similarities and differences in SOLtransport between tokamaks and a typical helical device. Discussion …

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Detachment Phenomena in LHD Compared to W7-AS

Junichi MIYAZAWA, S. Masuzaki, H. Yamada, Ryuichi Sakamoto et autres

Self-sustained detachment, named the Serpens mode (Self-regulated plasma edge ’neath the last closed flux surface), has been observed in the Large Helical Device (LHD), which is equipped with an intrinsic open helical divertor, in spite of the low divertor neutral pressure of …

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