Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

Killer, Carsten; Gao, Yu; Perseo, Valeria; Rudischhauser, Lukas; Hammond, Kenneth; Buttenschön, Birger; Barbui, Tullio; Blackwell, Boyd D.; Brunner, Kai-Jakob; Drews, Philipp; Endler, Michael; Geiger, Joachim; Grulke, Olaf; Jakubowski, Marcin; Klose, Sören; Knauer, Jens; Knieps, Alexander; König, Ralf; Li, Yongliang; Neuner, Ulrich; Niemann, Holger; Otte, Matthias; Schilling, Jonathan; Sitjes, Aleix Puig; Rahbarnia, Kian; Stange, Torsten

doi:10.1088/1361-6587/ab4f2d

Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer

Journal Article · Fri Nov 08 00:00:00 EST 2019 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab4f2d· OSTI ID:1651115

^[1]; ^[2]; ^[1]; ^[1]; ^[1]; ^[1]; Barbui, Tullio ^[3]; Blackwell, Boyd D. ^[4]; Brunner, Kai-Jakob ^[1]; ^[2]; ^[1]; ^[1]; Grulke, Olaf ^[5]; ^[1]; Klose, Sören ^[1]; ^[1]; Knieps, Alexander ^[2]; König, Ralf ^[1]; Li, Yongliang ^[2]; Neuner, Ulrich ^[1] more »

Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
Forschungszentrum Juelich (Germany)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Australian National Univ., Canberra, ACT (Australia)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics; Technical Univ. of Denmark, Lyngby (Denmark)

The role of toroidal plasma currents for the island divertor scrape-off layer in the stellarator Wendelstein 7-X is investigated using reciprocating electric probes. Experiments show that small amounts (of a few kA) of plasma current are sufficient to significantly affect the scrape-off layer plasma conditions, whereas higher plasma currents above 10kA result in more drastic changes. This behavior is linked to the effect of the plasma current on the rotational transform profile, which can result in significant shifts of the edge magnetic islands. These shifts affect the interaction of the islands with the divertor and can eventually result in a transition from a diverted to a limited plasma configuration. The probe observations are complemented by further edge diagnostics including plasma flow measurements, divertor Langmuir probes, divertor thermography and impurity spectroscopy.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 1651115

Alternate ID(s):: OSTI ID: 23004152

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 61; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (35)

Effects of Net Currents on the Magnetic Configuration of W7-X Geiger, J.; Beidler, C. D.; Drevlak, M. Contributions to Plasma Physics, Vol. 50, Issue 8 https://doi.org/10.1002/ctpp.200900028	journal	July 2010
Designs of Langmuir probes for W7-X Laube, Ralph; Laux, Michael; Ye, Min You Fusion Engineering and Design, Vol. 86, Issue 6-8 https://doi.org/10.1016/j.fusengdes.2010.12.059	journal	October 2011
Engineering design for the magnetic diagnostics of Wendelstein 7-X Endler, M.; Brucker, B.; Bykov, V. Fusion Engineering and Design, Vol. 100 https://doi.org/10.1016/j.fusengdes.2015.07.020	journal	November 2015
A multi-purpose manipulator system for W7-X as user facility for plasma edge investigation Nicolai, D.; Borsuk, V.; Drews, P. Fusion Engineering and Design, Vol. 123 https://doi.org/10.1016/j.fusengdes.2017.03.013	journal	November 2017
Edge plasma measurements on the OP 1.2a divertor plasmas at W7-X using the combined probe Drews, P.; Killer, C.; Cosfeld, J. Nuclear Materials and Energy, Vol. 19 https://doi.org/10.1016/j.nme.2019.02.012	journal	May 2019
Magnetic configuration effects on the Wendelstein 7-X stellarator Dinklage, A.; Beidler, C. D.; Helander, P. Nature Physics, Vol. 14, Issue 8 https://doi.org/10.1038/s41567-018-0141-9	journal	May 2018
ECCD operations in the second experimental campaign at W7-X Zanini, M.; Laqua, H. P.; Stange, T. EPJ Web of Conferences, Vol. 203 https://doi.org/10.1051/epjconf/201920302013	journal	January 2019
Design of a high–efficiency extreme ultraviolet overview spectrometer system for plasma impurity studies on the stellarator experiment Wendelstein 7-X Biel, W.; Bertschinger, G.; Burhenn, R. Review of Scientific Instruments, Vol. 75, Issue 10 https://doi.org/10.1063/1.1784557	journal	September 2004
Physics optimization of stellarators Grieger, G.; Lotz, W.; Merkel, P. Physics of Fluids B: Plasma Physics, Vol. 4, Issue 7 https://doi.org/10.1063/1.860481	journal	March 1992
Physics of island divertors as highlighted by the example of W7-AS Feng, Y.; Sardei, F.; Grigull, P. Nuclear Fusion, Vol. 46, Issue 8 https://doi.org/10.1088/0029-5515/46/8/006	journal	July 2006
Experimental study of the poloidal flow effect on magnetic island dynamics in LHD and TJ-II Narushima, Y.; Castejón, F.; Sakakibara, S. Nuclear Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0029-5515/51/8/083030	journal	July 2011
Access to edge scenarios for testing a scraper element in early operation phases of Wendelstein 7-X Hölbe, H.; Sunn Pedersen, T.; Geiger, J. Nuclear Fusion, Vol. 56, Issue 2 https://doi.org/10.1088/0029-5515/56/2/026015	journal	January 2016
Methods for measuring 1/1 error field in Wendelstein 7-X stellarator Bozhenkov, S. A.; Lazerson, S.; Otte, M. Nuclear Fusion, Vol. 56, Issue 7 https://doi.org/10.1088/0029-5515/56/7/076002	journal	June 2016
Current drive and bootstrap current in stellarators Erckmann, V.; Gasparino, U.; MaaBberg, H. Plasma Physics and Controlled Fusion, Vol. 34, Issue 13 https://doi.org/10.1088/0741-3335/34/13/021	journal	December 1992
A comparative study of transport in stellarators and tokamaks Stroth, Ulrich Plasma Physics and Controlled Fusion, Vol. 40, Issue 1 https://doi.org/10.1088/0741-3335/40/1/002	journal	January 1998
The divertor program in stellarators K. nig, R.; Grigull, P.; McCormick, K. Plasma Physics and Controlled Fusion, Vol. 44, Issue 11 https://doi.org/10.1088/0741-3335/44/11/306	journal	October 2002
Major results from the stellarator Wendelstein 7-AS Hirsch, M.; Baldzuhn, J.; Beidler, C. Plasma Physics and Controlled Fusion, Vol. 50, Issue 5 https://doi.org/10.1088/0741-3335/50/5/053001	journal	March 2008
Aspects of steady-state operation of the Wendelstein 7-X stellarator Geiger, J.; Wolf, R. C.; Beidler, C. Plasma Physics and Controlled Fusion, Vol. 55, Issue 1 https://doi.org/10.1088/0741-3335/55/1/014006	journal	December 2012
Physics in the magnetic configuration space of W7-X Geiger, J.; Beidler, C. D.; Feng, Y. Plasma Physics and Controlled Fusion, Vol. 57, Issue 1 https://doi.org/10.1088/0741-3335/57/1/014004	journal	November 2014
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies Wolf, R. C.; Bozhenkov, S.; Dinklage, A. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaeab2	journal	November 2018
Drift effects on W7-X divertor heat and particle fluxes Hammond, K. C.; Gao, Y.; Jakubowski, M. Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab4825	journal	October 2019
Numerical investigation of plasma edge transport and limiter heat fluxes in Wendelstein 7-X startup plasmas with EMC3-EIRENE Effenberg, F.; Feng, Y.; Schmitz, O. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa4f83	journal	January 2017
Error field measurement, correction and heat flux balancing on Wendelstein 7-X Lazerson, Samuel A.; Otte, Matthias; Jakubowski, Marcin Nuclear Fusion, Vol. 57, Issue 4 https://doi.org/10.1088/1741-4326/aa60e7	journal	March 2017
Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, S. Nuclear Fusion, Vol. 59, Issue 11 https://doi.org/10.1088/1741-4326/ab03a7	journal	June 2019
Characterization of the W7-X scrape-off layer using reciprocating probes Killer, Carsten; Grulke, Olaf; Drews, Philipp Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2272	journal	June 2019
First divertor physics studies in Wendelstein 7-X Sunn Pedersen, T.; König, R.; Jakubowski, M. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab280f	journal	July 2019
Effects of toroidal plasma current on divertor power depositions on Wendelstein 7-X Gao, Yu; Geiger, Joachim; Jakubowski, Marcin W. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c2	journal	August 2019
Scenario with combined density and heating control to reduce the impact of the bootstrap current in Wendelstein 7-X Sinha, P.; Böckenhoff, D.; Endler, M. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab37bb	journal	September 2019
Tuning of the rotational transform in Wendelstein 7-X Lazerson, Samuel A.; Gao, Yu; Hammond, Kenneth Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab3df0	journal	September 2019
Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology Perseo, V.; Effenberg, F.; Gradic, D. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab4320	journal	September 2019
Multi-channel retarding field analyzer for EAST Henkel, M.; HÖSchen, D.; Liang, Y. Plasma Science and Technology, Vol. 20, Issue 5 https://doi.org/10.1088/2058-6272/aab490	journal	April 2018
Design and Analysis of Divertor Scraper Elements for the W7-X Stellarator Lore, Jeremy D.; Andreeva, Tamara; Boscary, Jean IEEE Transactions on Plasma Science, Vol. 42, Issue 3 https://doi.org/10.1109/TPS.2014.2303649	journal	March 2014
Physical Aspects and Design of the Wendelstein 7-X Divertor Renner, Hermann; Sharma, Devendra; Kißlinger, Johann Fusion Science and Technology, Vol. 46, Issue 2 https://doi.org/10.13182/FST04-A570	journal	September 2004
Current Control by ECCD for W7-X Turkin, Yu.; Maassberg, H.; Beidler, C. D. Fusion Science and Technology, Vol. 50, Issue 3 https://doi.org/10.13182/FST06-5	journal	October 2006
Overview of first Wendelstein 7-X high-performance operation Klinger, T.; Andreeva, T.; Bozhenkov, Sergey Technische Universität Berlin https://doi.org/10.14279/depositonce-15100	text	January 2019

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Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements Perseo, Valeria; Gradic, Dorothea; König, Ralf Review of Scientific Instruments, Vol. 91, Issue 1 https://doi.org/10.1063/1.5126098	journal	January 2020

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