Effect of magnetic geometry on the energy partition between ions and electrons in the scrape-off layer of magnetic fusion devices

Li, Y.; Xu, G.; Dudson, B.; Liu, X.; Huang, Z.; Killer, C.; Feng, Y.; Liu, S.; Yan, N.; Morales, J.; Tsitrone, E.; Brezinsek, S.; Liang, Y.; Eldon, D.; Xiao, C.; Geiger, J.; Grulke, O.; Otte, M.; the WEST Team,; the W7-X Team,

doi:10.1088/1741-4326/ac7df1

Title: Effect of magnetic geometry on the energy partition between ions and electrons in the scrape-off layer of magnetic fusion devices

Journal Article · Wed Jul 20 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac7df1· OSTI ID:2246720

^[1];

;

; Feng, Y.;

;

; Tsitrone, E.;

; Liang, Y.;

;

; Grulke, O.; Otte, M.; the WEST Team,; the W7-X Team,

Forschungszentrum Juelich (Germany). Inst. for Energy and Climate Research (IEK); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of York (United Kingdom); WEST Team Collaboration. et al.; W7-X Team Collaboration. et al.

A universal energy partition mechanism between ions and electrons has been confirmed to exist in the scrape-off layer of both the WEST tokamak and the W7-X stellarator. A peaked plasma density structure induced by an infinite magnetic connection length structure is observed to destroy this dependence and enhance the local ion and electron temperature ratio in the stellarator. Here, a theoretical analysis reveals that the ratio of ion and electron parallel heat conduction is predominant in determining this universality, while electrons would further be cooled in the density-peaked region.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: WEST Team Collaboration, W7-X Team Collaboration

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2246720

Report Number(s):: LLNL-JRNL-829311; 1045229

Journal Information:: Nuclear Fusion, Vol. 62, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (24)

Spatial distributions of the ion to electron temperature ratio in the magnetosheath and plasma sheet: ION TO ELECTRON TEMPERATURE RATIO Wang, Chih-Ping; Gkioulidou, Matina; Lyons, Larry R. Journal of Geophysical Research: Space Physics, Vol. 117, Issue A8 https://doi.org/10.1029/2012JA017658	journal	August 2012
Energy Partition between Ion and Electron of Collisionless Magnetic Reconnection Hoshino, Masahiro The Astrophysical Journal, Vol. 868, Issue 2 https://doi.org/10.3847/2041-8213/aaef3a	journal	November 2018
Plasma-material interactions in current tokamaks and their implications for next step fusion reactors Federici, G.; Skinner, C. H.; Brooks, J. N. Nuclear Fusion, Vol. 41, Issue 12 https://doi.org/10.1088/0029-5515/41/12/218	journal	December 2001
Measurements of ion energies in the tokamak plasma boundary Kočan, M.; Gunn, J. P.; Carpentier-Chouchana, S. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.08.036	journal	August 2011
An assessment of ion temperature measurements in the boundary of the Alcator C-Mod tokamak and implications for ion fluid heat flux limiters Brunner, D.; LaBombard, B.; Churchill, R. M. Plasma Physics and Controlled Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0741-3335/55/9/095010	journal	July 2013
Comparison between stellarator and tokamak divertor transport Feng, Y.; Kobayashi, M.; Lunt, T. Plasma Physics and Controlled Fusion, Vol. 53, Issue 2 https://doi.org/10.1088/0741-3335/53/2/024009	journal	January 2011
Stellarator and tokamak plasmas: a comparison Helander, P.; Beidler, C. D.; Bird, T. M. Plasma Physics and Controlled Fusion, Vol. 54, Issue 12 https://doi.org/10.1088/0741-3335/54/12/124009	journal	November 2012
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
On the reliability of scrape-off layer ion temperature measurements by retarding field analyzers Kočan, M.; Gunn, J. P.; Komm, M. Review of Scientific Instruments, Vol. 79, Issue 7 https://doi.org/10.1063/1.2955465	journal	July 2008
Retarding field analyzer for the wendelstein 7-X boundary plasma Henkel, M.; Li, Y.; Liang, Y. Fusion Engineering and Design, Vol. 157 https://doi.org/10.1016/j.fusengdes.2020.111623	journal	August 2020
The WEST project: Testing ITER divertor high heat flux component technology in a steady state tokamak environment Bucalossi, J.; Missirlian, M.; Moreau, P. Fusion Engineering and Design, Vol. 89, Issue 7-8 https://doi.org/10.1016/j.fusengdes.2014.01.062	journal	October 2014
SOL studies for W7-X based on the island divertor concept Strumberger, E. Nuclear Fusion, Vol. 36, Issue 7 https://doi.org/10.1088/0029-5515/36/7/i06	journal	July 1996
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
Nonlinear turbulent parallel momentum transport due to blobs Li, Yang; Li, Jiquan; Gao, Zhe Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab181b	journal	May 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
Effect of toroidal plasma currents on the Wendelstein 7-X Scrape-Off Layer Killer, Carsten; Gao, Yu; Perseo, Valeria Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab4f2d	journal	November 2019
Measurements of plasma parameters in the divertor island of Wendelstein 7-X through line-ratio spectroscopy on helium Barbui, T.; Krychowiak, M.; Schmitz, O. Nuclear Fusion, Vol. 60, Issue 10 https://doi.org/10.1088/1741-4326/aba9eb	journal	September 2020
Measurement of edge plasma parameters at W7-X using alkali beam emission spectroscopy Anda, G.; Dunai, D.; Krizsanóczi, T. Fusion Engineering and Design, Vol. 146 https://doi.org/10.1016/j.fusengdes.2019.03.042	journal	September 2019
The relation between upstream density and temperature widths in the scrape-off layer and the power width in an attached divertor Stangeby, P. C.; Canik, J. M.; Whyte, D. G. Nuclear Fusion, Vol. 50, Issue 12 https://doi.org/10.1088/0029-5515/50/12/125003	journal	November 2010
Non-local approach to kinetic effects on parallel transport in fluid models of the scrape-off layer Omotani, J. T.; Dudson, B. D. Plasma Physics and Controlled Fusion, Vol. 55, Issue 5 https://doi.org/10.1088/0741-3335/55/5/055009	journal	April 2013
Comparison of scrape-off layer profiles in outboard-versus inboard-limited plasmas in Tore Supra Kočan, M.; Gunn, J. P. Plasma Physics and Controlled Fusion, Vol. 52, Issue 4 https://doi.org/10.1088/0741-3335/52/4/045010	journal	March 2010
Finite ion temperature effects on scrape-off layer turbulence Mosetto, Annamaria; Halpern, Federico D.; Jolliet, Sébastien Physics of Plasmas, Vol. 22, Issue 1 https://doi.org/10.1063/1.4904300	journal	January 2015
Turbulent transport regimes and the scrape-off layer heat flux width Myra, J. R.; D'Ippolito, D. A.; Russell, D. A. Physics of Plasmas, Vol. 22, Issue 4 https://doi.org/10.1063/1.4919255	journal	April 2015
2D coherence imaging measurements of C²⁺ ion temperatures in the divertor of Wendelstein 7-X Gradic, D.; Perseo, V.; Kriete, D. M. Nuclear Fusion, Vol. 61, Issue 10 https://doi.org/10.1088/1741-4326/ac25bf	journal	October 2021

Similar Records

Additional evidence for the universality of the probability distribution of turbulent fluctuations and fluxes in the scrape-off layer region of fusion plasmas

Journal Article · Sun May 15 00:00:00 EDT 2005 · Physics of Plasmas · OSTI ID:2246720

Milligen, B.Ph. van; Sanchez, R; Carreras, B A; +6 more

Additional Evidence for the Universality of the Probability Distribution of Turbulent Fluctuations and Fluxes in the Scrape-off Layer Region of Fusion Plasmas - art. no. 052507

Journal Article · Sun May 01 00:00:00 EDT 2005 · Physics of Plasmas · OSTI ID:2246720

van Milligen, B Ph; Sanchez, Raul; Carreras, Benjamin A; +6 more

2D measurements of parallel counter-streaming flows in the W7-X scrape-off layer for attached and detached plasmas

Journal Article · Thu Oct 07 00:00:00 EDT 2021 · Nuclear Fusion · OSTI ID:2246720

Perseo, V.; Winters, V.; Feng, Y.; +27 more

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
energy partition between ions and electrons
scrape-off layer
magnetic connection length
WEST
W7-X

Title: Effect of magnetic geometry on the energy partition between ions and electrons in the scrape-off layer of magnetic fusion devices

Citation Formats

References (24)

Similar Records

Related Subjects