Fascinating physics at the edge of magnetic fusion devices

Krasheninnikov, S. I.

doi:10.1088/1361-6587/ac9b8e

Fascinating physics at the edge of magnetic fusion devices

Journal Article · 10 November 2022 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac9b8e· OSTI ID:2419034

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OSTI

Abstract

The physics of the processes at the edge of magnetic fusion devices is multifaceted and exhibits complex, nonlinear synergistic effects. Even though this region occupies only a small portion of the whole device, it plays a crucial role in overall plasma confinement, heat exhaust, and plasma–wall interactions. The latter affects not only the performance but also the lifetime of plasma-facing components and therefore remains an outstanding challenge for future fusion reactors. At the edge of fusion devices, researchers are dealing with phenomena including classical and anomalous plasma transport, atomic physics effects, and physics of plasma-facing material under strong irradiation by particle and energy fluxes. The diversity of edge physics makes it particularly attractive for young scientists. Working in this field, they can find endless possibilities to demonstrate their talents and creativity. This short review describes just some of the basic scrape-off layer and divertor plasma phenomena including divertor plasma detachment, intermittent bursts of anomalous cross-field plasma transport, plasma–material interactions, and dust in fusion plasmas, which are of particular interest in relation to fusion reactors.

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-04ER54739; FG02-06ER54852; SC0018302;

OSTI ID:: 2419034

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 64; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

References (75)

Simulation of Detachment in ITER-Geometry Using the UEDGE Code and a Fluid Neutral Model Wising, F.; Knoll, D. A.; Krasheninnikov, S. I. Contributions to Plasma Physics, Vol. 36, Issue 2-3 https://doi.org/10.1002/ctpp.2150360238	journal	January 1996
Taming the Heat Flux Problem: Advanced Divertors Towards Fusion Power Kotschenreuther, M.; Mahajan, S.; Valanju, P. M. Journal of Fusion Energy, Vol. 35, Issue 1 https://doi.org/10.1007/s10894-015-0007-4	journal	September 2015
A brief history of negative triangularity tokamak plasmas Marinoni, A.; Sauter, O.; Coda, S. Reviews of Modern Plasma Physics, Vol. 5, Issue 1 https://doi.org/10.1007/s41614-021-00054-0	journal	October 2021
Dust and powder in fusion plasmas: recent developments in theory, modeling, and experiments Ratynskaia, S.; Bortolon, A.; Krasheninnikov, S. I. Reviews of Modern Plasma Physics, Vol. 6, Issue 1 https://doi.org/10.1007/s41614-022-00081-5	journal	August 2022
Survey of atomic processes in edge plasmas Janev, R. K.; Post, D. E.; Langer, W. D. Journal of Nuclear Materials, Vol. 121 https://doi.org/10.1016/0022-3115(84)90096-5	journal	May 1984
Plasma recombination and divertor detachment Krasheninnikov, S. I.; Pigarov, A. Yu.; Sigmar, D. J. Physics Letters A, Vol. 214, Issue 5-6 https://doi.org/10.1016/0375-9601(96)00185-5	journal	May 1996
Observation of molecular assisted recombination via negative ions formation in a divertor plasma simulator, TPDSHEET-IV Tonegawa, Akira; Ono, Masataka; Morihira, Yasushi Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/S0022-3115(02)01535-0	journal	March 2003
The experimental determination of the volume recombination rate in tokamak divertors Terry, J. L.; Lipschultz, B.; Bonnin, X. Journal of Nuclear Materials, Vol. 266-269 https://doi.org/10.1016/S0022-3115(98)00812-5	journal	March 1999
Structural materials for fission & fusion energy Zinkle, Steven J.; Busby, Jeremy T. Materials Today, Vol. 12, Issue 11 https://doi.org/10.1016/S1369-7021(09)70294-9	journal	November 2009
Dust generation in tokamaks: Overview of beryllium and tungsten dust characterisation in JET with the ITER-like wall Rubel, M.; Widdowson, A.; Grzonka, J. Fusion Engineering and Design, Vol. 136 https://doi.org/10.1016/j.fusengdes.2018.03.027	journal	November 2018
Recent analysis of key plasma wall interactions issues for ITER Roth, Joachim; Tsitrone, E.; Loarte, A. Journal of Nuclear Materials, Vol. 390-391 https://doi.org/10.1016/j.jnucmat.2009.01.037	journal	June 2009
Dynamic fuel retention and release under ITER like wall conditions in JET Philipps, V.; Loarer, T.; Esser, H. G. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.234	journal	July 2013
Molecular dynamics simulation of the effect of sub-surface helium bubbles on hydrogen retention in tungsten Juslin, N.; Wirth, B. D. Journal of Nuclear Materials, Vol. 438 https://doi.org/10.1016/j.jnucmat.2013.01.270	journal	July 2013
Atomistic modeling of growth and coalescence of helium nano-bubbles in tungsten Smirnov, R. D.; Krasheninnikov, S. I.; Guterl, J. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.10.033	journal	August 2015
Plasma-surface interaction in the Be/W environment: Conclusions drawn from the JET-ILW for ITER Brezinsek, S. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.12.007	journal	August 2015
Electron pressure balance in the SOL through the transition to detachment McLean, A. G.; Leonard, A. W.; Makowski, M. A. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2015.01.066	journal	August 2015
Retention in tungsten resulting from extremely high fluence plasma exposure Doerner, R. P.; Baldwin, M. J.; Lynch, T. C. Nuclear Materials and Energy, Vol. 9 https://doi.org/10.1016/j.nme.2016.04.008	journal	December 2016
Energy balance in plasma detachment Pshenov, A. A.; Kukushkin, A. S.; Krasheninnikov, S. I. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.03.019	journal	August 2017
ELM divertor peak energy fluence scaling to ITER with data from JET, MAST and ASDEX upgrade Eich, T.; Sieglin, B.; Thornton, A. J. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.04.014	journal	August 2017
Physics basis for the first ITER tungsten divertor Pitts, R. A.; Bonnin, X.; Escourbiac, F. Nuclear Materials and Energy, Vol. 20 https://doi.org/10.1016/j.nme.2019.100696	journal	August 2019
Continuous observation of filaments from the confined region to the far scrape-off layer Griener, M.; Wolfrum, E.; Birkenmeier, G. Nuclear Materials and Energy, Vol. 25 https://doi.org/10.1016/j.nme.2020.100854	journal	December 2020
Recent theoretical progress in understanding coherent structures in edge and SOL turbulence Krasheninnikov, S. I.; D'Ippolito, D. A.; Myra, J. R. Journal of Plasma Physics, Vol. 74, Issue 5 https://doi.org/10.1017/S0022377807006940	journal	October 2008
Physics of ultimate detachment of a tokamak divertor plasma Krasheninnikov, S. I.; Kukushkin, A. S. Journal of Plasma Physics, Vol. 83, Issue 5 https://doi.org/10.1017/S0022377817000654	journal	September 2017
The physics of turbulence localised to the tokamak divertor volume Walkden, Nicholas; Riva, Fabio; Harrison, James Communications Physics, Vol. 5, Issue 1 https://doi.org/10.1038/s42005-022-00906-2	journal	June 2022
Particle transport in the scrape-off layer and its relationship to discharge density limit in Alcator C-Mod LaBombard, B.; Boivin, R. L.; Greenwald, M. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1352596	journal	May 2001
On lithium walls and the performance of magnetic fusion devices Krasheninnikov, S. I.; Zakharov, L. E.; Pereverzev, G. V. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1558293	journal	May 2003
Convective transport by intermittent blob-filaments: Comparison of theory and experiment D’Ippolito, D. A.; Myra, J. R.; Zweben, S. J. Physics of Plasmas, Vol. 18, Issue 6 https://doi.org/10.1063/1.3594609	journal	June 2011
Edge transport studies in the edge and scrape-off layer of the National Spherical Torus Experiment with Langmuir probes Boedo, J. A.; Myra, J. R.; Zweben, S. Physics of Plasmas, Vol. 21, Issue 4 https://doi.org/10.1063/1.4873390	journal	April 2014
Edge-localized-modes in tokamaks Leonard, A. W. Physics of Plasmas, Vol. 21, Issue 9 https://doi.org/10.1063/1.4894742	journal	September 2014
The appearance and propagation of filaments in the private flux region in Mega Amp Spherical Tokamak Harrison, J. R.; Fishpool, G. M.; Thornton, A. J. Physics of Plasmas, Vol. 22, Issue 9 https://doi.org/10.1063/1.4929924	journal	September 2015
The snowflake divertor Ryutov, D. D.; Soukhanovskii, V. A. Physics of Plasmas, Vol. 22, Issue 11 https://doi.org/10.1063/1.4935115	journal	November 2015
Divertor plasma detachment Krasheninnikov, S. I.; Kukushkin, A. S.; Pshenov, A. A. Physics of Plasmas, Vol. 23, Issue 5 https://doi.org/10.1063/1.4948273	journal	May 2016
Radiative detached divertor with acceptable separatrix Z _eff Pigarov, A. Yu. Physics of Plasmas, Vol. 24, Issue 10 https://doi.org/10.1063/1.4986516	journal	October 2017
Challenges for plasma-facing components in nuclear fusion Linke, Jochen; Du, Juan; Loewenhoff, Thorsten Matter and Radiation at Extremes, Vol. 4, Issue 5 https://doi.org/10.1063/1.5090100	journal	September 2019
Plasma recombination and molecular effects in tokamak divertors and divertor simulators Krasheninnikov, S. I.; Pigarov, A. Yu.; Knoll, D. A. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872268	journal	May 1997
Time-dependent modeling of dust outburst into tokamak divertor plasma Smirnov, R. D.; Krasheninnikov, S. I. Physics of Plasmas, Vol. 27, Issue 8 https://doi.org/10.1063/5.0009767	journal	August 2020
Crystallographic analysis of nano-tendril bundle vs fuzz growth on tungsten exposed to helicon wave-coupled helium plasma Woller, K. B.; Whyte, D. G.; Wright, G. M. Journal of Applied Physics, Vol. 129, Issue 11 https://doi.org/10.1063/5.0027438	journal	March 2021
Design and experimental demonstration of feedback adaptive RMP ELM controller toward complete long pulse ELM suppression on KSTAR Shousha, R.; Kim, S. K.; Erickson, K. G. Physics of Plasmas, Vol. 29, Issue 3 https://doi.org/10.1063/5.0081928	journal	March 2022
Temporal structure of blobs in NSTX Zweben, S. J.; Lampert, M.; Myra, J. R. Physics of Plasmas, Vol. 29, Issue 7 https://doi.org/10.1063/5.0097282	journal	July 2022
Self-sustained oscillations in the divertor plasma Krasheninnikov, S. I.; Kukushkin, A. S.; Pistunovich, V. I. Nuclear Fusion, Vol. 27, Issue 11 https://doi.org/10.1088/0029-5515/27/11/006	journal	November 1987
Transport phenomena in the edge of Alcator C-Mod plasmas Terry, J. L.; Basse, N. P.; Cziegler, I. Nuclear Fusion, Vol. 45, Issue 11 https://doi.org/10.1088/0029-5515/45/11/013	journal	October 2005
Chapter 4: Power and particle control Loarte, A.; Lipschultz, B.; Kukushkin, A. S. Nuclear Fusion, Vol. 47, Issue 6 https://doi.org/10.1088/0029-5515/47/6/S04	journal	June 2007
Intermittent divertor filaments in the National Spherical Torus Experiment and their relation to midplane blobs Maqueda, R. J.; Stotler, D. P. Nuclear Fusion, Vol. 50, Issue 7 https://doi.org/10.1088/0029-5515/50/7/075002	journal	June 2010
Li experiments on T-11M and T-10 in support of a steady-state tokamak concept with Li closed loop circulation Mirnov, S. V.; Azizov, E. A.; Alekseev, A. G. Nuclear Fusion, Vol. 51, Issue 7 https://doi.org/10.1088/0029-5515/51/7/073044	journal	June 2011
On the shear strength of tungsten nano-structures with embedded helium Smirnov, R. D.; Krasheninnikov, S. I. Nuclear Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0029-5515/53/8/082002	journal	July 2013
Enhanced H-mode pedestals with lithium injection in DIII-D Osborne, T. H.; Jackson, G. L.; Yan, Z. Nuclear Fusion, Vol. 55, Issue 6 https://doi.org/10.1088/0029-5515/55/6/063018	journal	May 2015
He cluster dynamics in fusion related plasma facing materials Krasheninnikov, S. I.; Smirnov, R. D. Nuclear Fusion, Vol. 55, Issue 7 https://doi.org/10.1088/0029-5515/55/7/073005	journal	June 2015
Hydrogen transport in solids with traps in the case of continuum distribution of detrapping energies Krasheninnikov, S. I.; Marenkov, E. D.; Smirnov, R. D. Physica Scripta, Vol. T159 https://doi.org/10.1088/0031-8949/2014/T159/014060	journal	April 2014
Zonal flows in plasma—a review Diamond, P. H.; Itoh, S-I; Itoh, K. Plasma Physics and Controlled Fusion, Vol. 47, Issue 5 https://doi.org/10.1088/0741-3335/47/5/R01	journal	April 2005
Two-point analysis of the numerical modelling of detached divertor plasmas Kotov, V.; Reiter, D. Plasma Physics and Controlled Fusion, Vol. 51, Issue 11 https://doi.org/10.1088/0741-3335/51/11/115002	journal	October 2009
Inter-ELM filaments and turbulent transport in the Mega-Amp Spherical Tokamak Ben Ayed, N.; Kirk, A.; Dudson, B. Plasma Physics and Controlled Fusion, Vol. 51, Issue 3 https://doi.org/10.1088/0741-3335/51/3/035016	journal	January 2009
Dust in magnetic fusion devices Krasheninnikov, S. I.; Smirnov, R. D.; Rudakov, D. L. Plasma Physics and Controlled Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0741-3335/53/8/083001	journal	May 2011
Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade Fuchert, G.; Birkenmeier, G.; Carralero, D. Plasma Physics and Controlled Fusion, Vol. 56, Issue 12 https://doi.org/10.1088/0741-3335/56/12/125001	journal	October 2014
Study of near scrape-off layer (SOL) temperature and density gradient lengths with Thomson scattering Sun, H. J.; Wolfrum, E.; Eich, T. Plasma Physics and Controlled Fusion, Vol. 57, Issue 12 https://doi.org/10.1088/0741-3335/57/12/125011	journal	November 2015
Dust remobilization in fusion plasmas under steady state conditions Tolias, P.; Ratynskaia, S.; De Angeli, M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 2 https://doi.org/10.1088/0741-3335/58/2/025009	journal	January 2016
Blob structure and motion in the edge and SOL of NSTX Zweben, S. J.; Myra, J. R.; Davis, W. M. Plasma Physics and Controlled Fusion, Vol. 58, Issue 4, Article No. 044007 https://doi.org/10.1088/0741-3335/58/4/044007	journal	January 2016
A review of direct experimental measurements of detachment Boedo, J.; McLean, A. G.; Rudakov, D. L. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaa2ec	journal	February 2018
Recent progress towards a quantitative description of filamentary SOL transport Carralero, D.; Siccinio, M.; Komm, M. Nuclear Fusion, Vol. 57, Issue 5 https://doi.org/10.1088/1741-4326/aa64b3	journal	April 2017
Stress-induced hydrogen self-trapping in tungsten Smirnov, R. D.; Krasheninnikov, S. I. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aae2c7	journal	October 2018
Determination of the tolerable impurity concentrations in a fusion reactor using a consistent set of cooling factors Pütterich, T.; Fable, E.; Dux, R. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0384	journal	March 2019
Scrape-off layer transport and filament characteristics in high-density tokamak regimes Vianello, N.; Carralero, D.; Tsui, C. K. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab423e	journal	October 2019
Micro-analyses of dust particles generated in the JET tokamak with the ITER-like wall Fazinić, Stjepko; Božičević-Mihali, Iva; Provatas, Georgios Nuclear Fusion, Vol. 60, Issue 12 https://doi.org/10.1088/1741-4326/abb53d	journal	October 2020
Effects of elastic softening and helium accumulation kinetics on surface morphological evolution of plasma-facing tungsten Chen, Chao-Shou; Dasgupta, Dwaipayan; Weerasinghe, Asanka Nuclear Fusion, Vol. 61, Issue 1 https://doi.org/10.1088/1741-4326/abbf64	journal	November 2020
Initial TCV operation with a baffled divertor Reimerdes, H.; Duval, B. P.; Elaian, H. Nuclear Fusion, Vol. 61, Issue 2 https://doi.org/10.1088/1741-4326/abd196	journal	January 2021
Understanding detachment of the W7-X island divertor Feng, Y.; Jakubowski, M.; König, R. Nuclear Fusion, Vol. 61, Issue 8 https://doi.org/10.1088/1741-4326/ac0772	journal	June 2021
The role of plasma-molecule interactions on power and particle balance during detachment on the TCV tokamak Verhaegh, K.; Lipschultz, B.; Harrison, J. R. Nuclear Fusion, Vol. 61, Issue 10 https://doi.org/10.1088/1741-4326/ac1dc5	journal	September 2021
Experimental validation of universal plasma blob formation mechanism Bisai, N.; Banerjee, Santanu; Zweben, S. J. Nuclear Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1741-4326/ac3f1a	journal	January 2022
Simulations of liquid metal flows over plasma-facing component edges and application to beryllium melt events in JET Vignitchouk, L.; Ratynskaia, S.; Pitts, R. A. Nuclear Fusion, Vol. 62, Issue 3 https://doi.org/10.1088/1741-4326/ac47b7	journal	January 2022
Spectroscopic investigations of detachment on the MAST Upgrade Super-X divertor Verhaegh, K.; Lipschultz, B.; Harrison, J. R. Nuclear Fusion, Vol. 63, Issue 1 https://doi.org/10.1088/1741-4326/aca10a	journal	December 2022
Helium, hydrogen, and fuzz in plasma-facing materials Hammond, Karl D. Materials Research Express, Vol. 4, Issue 10 https://doi.org/10.1088/2053-1591/aa8c22	journal	October 2017
Observation of Flat Electron Temperature Profiles in the Lithium Tokamak Experiment Boyle, D. P.; Majeski, R.; Schmitt, J. C. Physical Review Letters, Vol. 119, Issue 1 https://doi.org/10.1103/PhysRevLett.119.015001	journal	July 2017
E × B Flux Driven Detachment Bifurcation in the DIII-D Tokamak Jaervinen, A. E.; Allen, S. L.; Eldon, D. Physical Review Letters, Vol. 121, Issue 7 https://doi.org/10.1103/PhysRevLett.121.075001	journal	August 2018
Quasicontinuous Exhaust Scenario for a Fusion Reactor: The Renaissance of Small Edge Localized Modes Harrer, G. F.; Faitsch, M.; Radovanovic, L. Physical Review Letters, Vol. 129, Issue 16 https://doi.org/10.1103/PhysRevLett.129.165001	journal	October 2022
Experimental Evidence of Molecular Activated Recombination in Detached Recombining Plasmas Ohno, N.; Ezumi, N.; Takamura, S. Physical Review Letters, Vol. 81, Issue 4 https://doi.org/10.1103/PhysRevLett.81.818	journal	July 1998
Review of plasma turbulence experiments Fujisawa, Akihide Proceedings of the Japan Academy, Series B, Vol. 97, Issue 3 https://doi.org/10.2183/pjab.97.006	journal	March 2021

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