First neutral beam experiments on Wendelstein 7-X

Lazerson, Samuel A.; Ford, Oliver P.; Äkäslompolo, Simppa Johannes; Bozhenkov, Sergey A.; Slaby, Christoph; Vano, Lilla; Spanier, Annabelle; McNeely, Paul; Rust, Norbert; Hartmann, Dirk; Poloskei, Peter Zsolt; Buttenschön, Birger; Burhenn, Rainer; Tamura, Naoki; Bussiahn, Rene; Wegner, Thomas; Drevlak, Michael; Turkin, Yuriy; Ogawa, Kunihiro; Knauer, Jens P.; Brunner, Kai Jakob; Pasch, Ekkehard; Beurskens, Marc A.; Damm, Hannes; Fuchert, Golo; Nelde, Philipp; Scott, Evan R.; Pablant, Novimir Antoniuk; Langenberg, Andreas; Traverso, Peter; Valson, Pranay; Hergenhahn, Uwe; Pavone, Andrea; Rahbarnia, Kian; Andreeva, Tamara; Schilling, Jonathan; Brandt, Christian; Neuner, Ulrich; Thomsen, H.; Chaudhary, Neha; Höfel, Udo; Stange, Torsten; Weir, Gavin McCabe; Marushchenko, Nikolai B.; Jakubowski, Marcin; Ali, Adnan; Gao, Yu; Niemann, Holger; Puig Sitjes, Aleix; Koenig, Ralf; Schroeder, Ralf; den Harder, Niek; Heinemann, Bernd; Hopf, Christian; Riedl, Rudolf; Wolf, Robert C.

doi:10.1088/1741-4326/ac121c

First neutral beam experiments on Wendelstein 7-X

Journal Article · Mon Jul 26 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac121c· OSTI ID:1814206

; Ford, Oliver P.; ; ; Slaby, Christoph; Vano, Lilla; Spanier, Annabelle; McNeely, Paul; Rust, Norbert; ; Poloskei, Peter Zsolt; ; Burhenn, Rainer; ; Bussiahn, Rene; ; Drevlak, Michael; Turkin, Yuriy; ; Knauer, Jens P. more »

In the previous divertor campaign, the Wendelstein 7-X (W7-X) device injected 3.6 MW of neutral beam heating power allowing for the achievement of densities approaching 2 × 10²⁰ m^-3, and providing the first initial assessment of fast ion confinement in a drift optimized stellarator. The neutral beam injection (NBI) system on W7-X is comprised of two beam boxes with space for four radio frequency sources each. The 3.6 MW of heating reported in this work was achieved with two sources in the NI21 beam box. The effect of combined electron-cyclotron resonance heating (ECRH) and NBI was explored through a series of discharges varying both NBI and ECRH power. Discharges without ECRH saw a linear increase in the line-integrated plasma density, and strong peaking of the core density, over the discharge duration. The presence of 1 MW of ECRH power was found to be sufficient to control a continuous density rise during NBI operation. Simulations of fast ion wall loads were found to be consistent with experimental infrared camera images during operation. In general, NBI discharges were free from the presence of fast ion induced Alfvénic activity, consistent with low beam betas. These experiments provide data for future scenario development and initial assessment of fast-ion confinement in W7-X, a key topic of the project.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: EUROfusion Consortium; Euratom Research and Training Programme

Contributing Organization:: W7-X Team

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1814206

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (23)

Armoring of the Wendelstein 7-X divertor-observation immersion-tubes based on NBI fast-ion simulations Äkäslompolo, Simppa; Drewelow, Peter; Gao, Yu Fusion Engineering and Design, Vol. 146 https://doi.org/10.1016/j.fusengdes.2019.01.099	journal	September 2019
Commissioning and initial operation of the W7-X neutral beam injection heating system McNeely, P.; Äkäslompolo, S.; Auerweck, W. Fusion Engineering and Design, Vol. 161 https://doi.org/10.1016/j.fusengdes.2020.111997	journal	December 2020
Performance of the first neutral beam injector at the Wendelstein 7-X stellarator Spanier, Annabelle; Hartmann, Dirk; Äkäslompolo, Simppa Fusion Engineering and Design, Vol. 163 https://doi.org/10.1016/j.fusengdes.2020.112115	journal	February 2021
New results from the tungsten programme at ASDEX Upgrade Neu, R.; Dux, R.; Geier, A. Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/s0022-3115(02)01386-7	journal	March 2003
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
High efficiency extreme ultraviolet overview spectrometer: Construction and laboratory testing Biel, W.; Greiche, A.; Burhenn, R. Review of Scientific Instruments, Vol. 77, Issue 10 https://doi.org/10.1063/1.2221659	journal	October 2006
Tracer-encapsulated solid pellet injection system Sudo, Shigeru; Tamura, Naoki Review of Scientific Instruments, Vol. 83, Issue 2 https://doi.org/10.1063/1.3681447	journal	February 2012
Tracer-Encapsulated Solid Pellet (TESPEL) injection system for Wendelstein 7-X Bussiahn, R.; Tamura, N.; McCarthy, K. J. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038844	journal	October 2018
Collective Thomson scattering diagnostic at Wendelstein 7-X Moseev, D.; Stejner, M.; Stange, T. Review of Scientific Instruments, Vol. 90, Issue 1 https://doi.org/10.1063/1.5050193	journal	January 2019
Development of a Faraday cup fast ion loss detector for keV beam ions Lazerson, Samuel A.; Ellis, Robert; Freeman, Chris Review of Scientific Instruments, Vol. 90, Issue 9 https://doi.org/10.1063/1.5111714	journal	September 2019
Charge exchange recombination spectroscopy at Wendelstein 7-X Ford, O. P.; Vanó, L.; Alonso, J. A. Review of Scientific Instruments, Vol. 91, Issue 2 https://doi.org/10.1063/1.5132936	journal	February 2020
Development of the ion cyclotron emission diagnostic for the W7-X stellarator Moseev, D.; Ochoukov, R.; Bobkov, V. Review of Scientific Instruments, Vol. 92, Issue 3 https://doi.org/10.1063/5.0040944	journal	March 2021
Assessment of the plasma start-up in Wendelstein 7-X with neutral beam injection Gradic, D.; Dinklage, A.; Brakel, R. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033002	journal	February 2015
BEAMS3D Neutral Beam Injection Model McMillan, Matthew; Lazerson, Samuel A. Plasma Physics and Controlled Fusion, Vol. 56, Issue 9 https://doi.org/10.1088/0741-3335/56/9/095019	journal	July 2014
Alfvénic fluctuations measured by in-vessel Mirnov coils at the Wendelstein 7-X stellarator Rahbarnia, K.; Thomsen, H.; Schilling, J. Plasma Physics and Controlled Fusion, Vol. 63, Issue 1 https://doi.org/10.1088/1361-6587/abc395	journal	November 2020
ASCOT simulations of 14 MeV neutron rates in W7-X: effect of magnetic configuration Kontula, J.; Koschinsky, J. P.; Äkäslompolo, S. Plasma Physics and Controlled Fusion, Vol. 63, Issue 3 https://doi.org/10.1088/1361-6587/abd981	journal	January 2021
Modelling of NBI ion wall loads in the W7-X stellarator Äkäslompolo, S.; Drevlak, M.; Turkin, Y. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aac4e5	journal	June 2018
Investigation of mode activity in NBI-heated experiments of Wendelstein 7-X Slaby, C.; Äkäslompolo, S.; Borchardt, M. Nuclear Fusion, Vol. 60, Issue 11 https://doi.org/10.1088/1741-4326/ab7c28	journal	August 2020
Validation of the BEAMS3D neutral beam deposition model on Wendelstein 7-X Lazerson, Samuel A.; Ford, Oliver P.; Nuehrenberg, Carolin Nuclear Fusion, Vol. 60, Issue 7 https://doi.org/10.1088/1741-4326/ab8e61	journal	June 2020
Impact of the temperature ratio on turbulent impurity transport in Wendelstein 7-X Wegner, Thomas; Alcuson, Jorge Alberto; Geiger, Benedikt Nuclear Fusion https://doi.org/10.1088/1741-4326/abb869	journal	September 2020
Heat pulse propagation and anomalous electron heat transport measurements on the optimized stellarator W7-X Weir, G. M.; Xanthopoulos, P.; Hirsch, M. Nuclear Fusion, Vol. 61, Issue 5 https://doi.org/10.1088/1741-4326/abea55	journal	March 2021
Modeling and measurement of energetic particle slowing down in Wendelstein 7-X Lazerson, Samuel A.; Pfefferlé, David; Drevlak, Michael Nuclear Fusion, Vol. 61, Issue 9 https://doi.org/10.1088/1741-4326/ac0771	journal	July 2021
Validating the ASCOT modelling of NBI fast ions in Wendelstein 7-X stellarator Äkäslompolo, S.; Drewelow, P.; Gao, Y. Journal of Instrumentation, Vol. 14, Issue 10 https://doi.org/10.1088/1748-0221/14/10/c10012	journal	October 2019

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