Pellet fueling experiments in Wendelstein 7-X

Baldzuhn, J.; Damm, H.; Beidler, C. D.; McCarthy, K.; Panadero, N.; Biedermann, C.; Bozhenkov, S. A.; Brunner, K. J.; Fuchert, G.; Kazakov, Y.; Beurskens, M.; Dibon, M.; Geiger, J.; Grulke, O.; Höfel, U.; Klinger, T.; Köchl, F.; Knauer, J.; Kocsis, G.; Kornejew, P.; Lang, P. T.; Langenberg, A.; Laqua, H.; Pablant, N. A.; Pasch, E.; Pedersen, T. S.; Ploeckl, B.; Rahbarnia, K.; Schlisio, G.; Scott, E. R.; Stange, T.; von Stechow, A.; Szepesi, T.; Turkin, Y.; Wagner, F.; Winters, V.; Wurden, Glen Anthony; Zhang, D.

doi:10.1088/1361-6587/ab3567

Title: Pellet fueling experiments in Wendelstein 7-X

Journal Article · Tue Aug 13 00:00:00 EDT 2019 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab3567· OSTI ID:1569618

^[1]; Damm, H. ^[1]; Beidler, C. D. ^[1];

^[2]; Panadero, N. ^[2]; Biedermann, C. ^[1];

^[1]; Brunner, K. J. ^[1]; Fuchert, G. ^[1]; Kazakov, Y. ^[3]; Beurskens, M. ^[1]; Dibon, M. ^[4]; Geiger, J. ^[1]; Grulke, O. ^[1]; Höfel, U. ^[1]; Klinger, T. ^[1]; Köchl, F. ^[5]; Knauer, J. ^[1]; Kocsis, G. ^[6]; Kornejew, P. ^[1] more »

Max-Planck Inst. fuer Plasmaphysik IPP, Greifswald (Germany)
CIEMAT, Madrid (Spain)
LPP-ERM/KMS, Brussels (Belgium)
Max-Planck Inst. fuer Plasmaphysik IPP, Garching (Germany)
Atominstitut TU Wien, Vienna (Austria)
Wigner Research Centre for Physiks, Budapest (Hungary)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Wisconsin, Madison, WI (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

During the two most recent experimental campaigns in the advanced stellarator Wendelstein 7-X (W7-X) (Klinger et al 2017 Plasma Phys. Control. Fusion 59 014018; Bosch et al 2017 Nucl. Fusion 57 116015; Wolf et al 2017 Nucl. Fusion 57 102020; Pedersen et al 2017 Phys. Plasmas 24 0555030) hydrogen ice pellet injection was performed for the first time. In order to investigate the potential of pellet fueling in W7-X and to study the particle deposition in a large stellarator, a blower-gun system was installed with 40 pellets capability. The experience gained with this system will be used for the specification of a future steady-state pellet injector system. One important motivation for a pellet injector (Dibon 2014 Master-Thesis Technical University Munich, Max-Planck Institut IPP) on W7-X is the mitigation of hollow density profiles expected in case of predominant neoclassical transport. For long-pulse operation of up to 30 min, only electron cyclotron resonance heating is available on W7-X. Hence, pellet injection will be the only source for deep particle fueling. Deep particle fueling by pellets in tokamaks is supported by a grad-B drift, if the pellets are injected from the magnetic high-field-side. This approach was tested in W7-X, as well. The injection of series of pellets was also tested. Here, deep fueling is supported for later pellets in the series by the plasma cooling following the initial pellets in the same series. As in earlier experiments in the heliotron LHD (Takeiri et al 2017 Nucl. Fusion 57 102023), deep and rapid fueling could be achieved successfully in W7-X.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Foreign Funding; USDOE

Contributing Organization:: Wendelstein 7-X Team

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1569618

Report Number(s):: LA-UR-19-23947; TRN: US2100273

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 61, Issue 9; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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References (34)

Blower Gun pellet injection system for W7-X Dibon, M.; Baldzuhn, J.; Beck, M. Fusion Engineering and Design, Vol. 98-99 https://doi.org/10.1016/j.fusengdes.2015.01.050	journal	October 2015
Design criteria of the bolometer diagnostic for steady-state operation of the W7-X stellarator Zhang, D.; Burhenn, R.; Koenig, R. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3483194	journal	October 2010
(Expected difficulties with) density-profile control in W7-X high-performance plasmas Beidler, C. D.; Feng, Y.; Geiger, J. Plasma Physics and Controlled Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1361-6587/aad970	journal	August 2018
Density limits in toroidal plasmas Greenwald, Martin Plasma Physics and Controlled Fusion, Vol. 44, Issue 8 https://doi.org/10.1088/0741-3335/44/8/201	journal	July 2002
Particle fueling experiments with a series of pellets in LHD Baldzuhn, J.; Damm, H.; Dinklage, A. Plasma Physics and Controlled Fusion, Vol. 60, Issue 3 https://doi.org/10.1088/1361-6587/aaa184	journal	January 2018
Comparison of pellet acceleration model results to experimentally observed penetration depths Szepesi, T.; Kálvin, S.; Kocsis, G. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.063	journal	June 2009
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
Performance and properties of the first plasmas of Wendelstein 7-X Klinger, T.; Alonso, A.; Bozhenkov, S. Plasma Physics and Controlled Fusion, Vol. 59, Issue 1 https://doi.org/10.1088/0741-3335/59/1/014018	journal	October 2016
Final integration, commissioning and start of the Wendelstein 7-X stellarator operation Bosch, H. -S.; Brakel, R.; Braeuer, T. Nuclear Fusion, Vol. 57, Issue 11 https://doi.org/10.1088/1741-4326/aa7cbb	journal	August 2017
Prospects of X-ray imaging spectrometers for impurity transport: Recent results from the stellarator Wendelstein 7-X (invited) Langenberg, A.; Pablant, N. A.; Wegner, Th. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5036536	journal	October 2018
The history of research into improved confinement regimes Wagner, F. Max-Planck-Institut für Plasmaphysik https://doi.org/10.17617/2.2380750	text	January 2017
Modelling of pellet ablation in additionally heated plasmas Pégourié, B.; Waller, V.; Dumont, R. J. Plasma Physics and Controlled Fusion, Vol. 47, Issue 1 https://doi.org/10.1088/0741-3335/47/1/002	journal	December 2004
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. Karlsruhe https://doi.org/10.5445/ir/1000089099	text	January 2019
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
Extension of the operational regime of the LHD towards a deuterium experiment Takeiri, Y.; Morisaki, T.; Osakabe, M. Nuclear Fusion, Vol. 57, Issue 10 https://doi.org/10.1088/1741-4326/aa7fc2	journal	August 2017
Service oriented architecture for scientific analysis at W7-X. An example of a field line tracer Bozhenkov, S. A.; Geiger, J.; Grahl, M. Fusion Engineering and Design, Vol. 88, Issue 11 https://doi.org/10.1016/j.fusengdes.2013.07.003	journal	November 2013
Characterization of energy confinement in net-current free plasmas using the extended International Stellarator Database Yamada, H.; Harris, J. H.; Dinklage, A. Nuclear Fusion, Vol. 45, Issue 12 https://doi.org/10.1088/0029-5515/45/12/024	journal	November 2005
First results from divertor operation in Wendelstein 7-X Pedersen, Thomas Sunn; König, Ralf; Krychowiak, Maciej Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aaec25	journal	November 2018
The history of research into improved confinement regimes Wagner, F. The European Physical Journal H, Vol. 43, Issue 4-5 https://doi.org/10.1140/epjh/e2016-70064-9	journal	January 2017
A comprehensive study on impurity behavior in LHD long pulse discharges Nakamura, Y.; Tamura, N.; Kobayashi, M. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2016.11.005	journal	August 2017
High-Efficiency Plasma Refuelling by Pellet Injection from the Magnetic High-Field Side into ASDEX Upgrade Lang, P. T.; Büchl, K.; Kaufmann, M. Physical Review Letters, Vol. 79, Issue 8 https://doi.org/10.1103/PhysRevLett.79.1487	journal	August 1997
Density control problems in large stellarators with neoclassical transport Maaßberg, H.; Beidler, C. D.; Simmet, E. E. Plasma Physics and Controlled Fusion, Vol. 41, Issue 9 https://doi.org/10.1088/0741-3335/41/9/306	journal	August 1999
Repetitive pellet fuelling for high-density/steady-state operation on LHD Sakamoto, R.; Yamada, H.; Takeiri, Y. Nuclear Fusion, Vol. 46, Issue 11 https://doi.org/10.1088/0029-5515/46/11/002	journal	September 2006
Observation of Stable Superdense Core Plasmas in the Large Helical Device Ohyabu, N.; Morisaki, T.; Masuzaki, S. Physical Review Letters, Vol. 97, Issue 5 https://doi.org/10.1103/PhysRevLett.97.055002	journal	August 2006
Technique for measuring D2 pellet mass loss through a curved guide tube using two microwave cavity detectors Combs, S. K.; Caughman, J. B. O.; Wilgen, J. B. Review of Scientific Instruments, Vol. 77, Issue 7 https://doi.org/10.1063/1.2219748	journal	July 2006
Upgrade of the Wendelstein 7-X Thomson Scattering Diagnostic to Study Short Transient Plasma Effects - A Demonstration on Pellet Injection for Stellarator Fuelling Damm, H. Max-Planck-Institut für Plasmaphysik https://doi.org/10.17617/2.2596741	text	January 2018
Modelling of the pellet deposition profile and ∇ B -induced drift displacement in non-axisymmetric configurations Matsuyama, A.; Koechl, F.; Pégourié, B. Nuclear Fusion, Vol. 52, Issue 12 https://doi.org/10.1088/0029-5515/52/12/123017	journal	November 2012
Experimental studies and simulations of hydrogen pellet ablation in the stellarator TJ-II Panadero, N.; McCarthy, K. J.; Koechl, F. Nuclear Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/1741-4326/aa9f8a	journal	January 2018
Key results from the first plasma operation phase and outlook for future performance in Wendelstein 7-X Sunn Pedersen, Thomas; Dinklage, Andreas; Turkin, Yuriy Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4983629	journal	May 2017
Overview video diagnostics for the W7-X stellarator Kocsis, G.; Baross, T.; Biedermann, C. Fusion Engineering and Design, Vol. 96-97 https://doi.org/10.1016/j.fusengdes.2015.02.067	journal	October 2015
The Thomson scattering system at Wendelstein 7-X Pasch, E.; Beurskens, M. N. A.; Bozhenkov, S. A. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4962248	journal	September 2016
Feedback controlled, reactor relevant, high-density, high-confinement scenarios at ASDEX Upgrade Lang, P. T.; Blanken, T. C.; Dunne, M. Nuclear Fusion, Vol. 58, Issue 3 https://doi.org/10.1088/1741-4326/aaa339	journal	January 2018
Major results from the first plasma campaign of the Wendelstein 7-X stellarator Wolf, R. C.; Ali, A.; Alonso, A. Nuclear Fusion, Vol. 57, Issue 10 https://doi.org/10.1088/1741-4326/aa770d	journal	July 2017
The impact of fast electrons on pellet injection in the stellarator TJ-II McCarthy, K. J.; Panadero, N.; Combs, S. K. Plasma Physics and Controlled Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1361-6587/aae038	journal	November 2018

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