Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod

Hughes, J. W.; Snyder, P. B.; Reinke, M. L.; LaBombard, B.; Mordijck, S.; Scott, S.; Tolman, E.; Baek, S. G.; Golfinopoulos, T.; Granetz, R. S.; Greenwald, M.; Hubbard, A. E.; Marmar, E.; Rice, J. E.; White, A. E.; Whyte, D. G.; Wilks, T.; Wolfe, S.

doi:10.1088/1741-4326/aabc8a

Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod

Journal Article · Thu Sep 27 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aabc8a· OSTI ID:1485108

^[1]; Snyder, P. B. ^[2]; ^[3]; ^[1]; Mordijck, S. ^[4]; Scott, S. ^[5]; Tolman, E. ^[1]; Baek, S. G. ^[1]; Golfinopoulos, T. ^[1]; Granetz, R. S. ^[1]; Greenwald, M. ^[1]; Hubbard, A. E. ^[1]; Marmar, E. ^[1]; ^[1]; White, A. E. ^[1]; Whyte, D. G. ^[1]; Wilks, T. ^[1]; Wolfe, S. ^[1]

MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
College of William and Mary, Williamsburg, VA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Here, experiments on the Alcator C-Mod tokamak have utilized reactor-relevant magnetic fields to sustain substantially higher pedestal pressure than in other devices and allow close approach to the ITER H-mode baseline target pedestal pressure of 90 kPa. The EPED model, which couples the physics of transport driven by kinetic ballooning modes and MHD instabilities arising from peeling-ballooning modes, predicts the pressure profile at the onset of edge-localized modes (ELMs), and yields to lowest order a critical-β _N like behavior for the pedestal: p α B_t x B_p (α B²_t for fixed edge q). C-Mod routinely accesses edge plasma pressure in excess of 30 kPa, often by using a high-density (n¯_e > 3 x 10²⁰ m^–3) approach to high confinement, taking advantage of a regime known as enhanced D-alpha (EDA) H-mode.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; AC05-00OR22725; FC02-06ER54873; FC02-99ER54512; FG02-95ER54309; SC0007880

OSTI ID:: 1485108

Alternate ID(s):: OSTI ID: 22929543

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 11 Vol. 58; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

References (52)

Compact ignition test reactor (CITR) Bromberg, L.; Cohn, D. R.; Williams, J. E. C. Journal of Fusion Energy, Vol. 1, Issue 2 https://doi.org/10.1007/BF01050654	journal	April 1981
FIRE, a next step option for magnetic fusion Meade, D. M. Fusion Engineering and Design, Vol. 63-64 https://doi.org/10.1016/S0920-3796(02)00282-X	journal	December 2002
ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets Sorbom, B. N.; Ball, J.; Palmer, T. R. Fusion Engineering and Design, Vol. 100 https://doi.org/10.1016/j.fusengdes.2015.07.008	journal	November 2015
The dynamics and structure of edge-localized-modes in Alcator C-Mod Terry, J. L.; Cziegler, I.; Hubbard, A. E. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2007.01.266	journal	June 2007
ELM flushing and impurity transport in the H-mode edge barrier in ASDEX Upgrade Pütterich, T.; Dux, R.; Janzer, M. A. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.09.052	journal	August 2011
Effect of N2, Ne and Ar seeding on Alcator C-Mod H-mode confinement Reinke, M. L.; Hughes, J. W.; Loarte, A. Journal of Nuclear Materials, Vol. 415, Issue 1 https://doi.org/10.1016/j.jnucmat.2010.10.055	journal	August 2011
Impact of wall materials and seeding gases on the pedestal and on core plasma performance Wolfrum, E.; Beurskens, M.; Dunne, M. G. Nuclear Materials and Energy, Vol. 12 https://doi.org/10.1016/j.nme.2017.01.002	journal	August 2017
Pedestal profiles and fluctuations in C-Mod enhanced D-alpha H-modes Hubbard, A. E.; Boivin, R. L.; Granetz, R. S. Physics of Plasmas, Vol. 8, Issue 5 https://doi.org/10.1063/1.1348329	journal	May 2001
Observations and empirical scalings of the high-confinement mode pedestal on Alcator C-Mod Hughes, J. W.; Mossessian, D. A.; Hubbard, A. E. Physics of Plasmas, Vol. 9, Issue 7 https://doi.org/10.1063/1.1486224	journal	July 2002
High-confinement-mode edge stability of Alcator C-mod plasmas Mossessian, D. A.; Snyder, P.; Hubbard, A. Physics of Plasmas, Vol. 10, Issue 5 https://doi.org/10.1063/1.1561618	journal	May 2003
Transport-driven scrape-off layer flows and the x-point dependence of the L-H power threshold in Alcator C-Mod LaBombard, B.; Rice, J. E.; Hubbard, A. E. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1876294	journal	May 2005
Advances in understanding quiescent H-mode plasmas in DIII-D Burrell, K. H.; West, W. P.; Doyle, E. J. Physics of Plasmas, Vol. 12, Issue 5 https://doi.org/10.1063/1.1894745	journal	May 2005
Advances in measurement and modeling of the high-confinement-mode pedestal on the Alcator C-Mod tokamak Hughes, J. W.; LaBombard, B.; Mossessian, D. A. Physics of Plasmas, Vol. 13, Issue 5 https://doi.org/10.1063/1.2180748	journal	May 2006
Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod plasmas McDermott, R. M.; Lipschultz, B.; Hughes, J. W. Physics of Plasmas, Vol. 16, Issue 5 https://doi.org/10.1063/1.3080721	journal	May 2009
High confinement/high radiated power H-mode experiments in Alcator C-Mod and consequences for International Thermonuclear Experimental Reactor (ITER) Q _DT = 10 operation Loarte, A.; Hughes, J. W.; Reinke, M. L. Physics of Plasmas, Vol. 18, Issue 5 https://doi.org/10.1063/1.3567547	journal	May 2011
New insights on boundary plasma turbulence and the quasi-coherent mode in Alcator C-Mod using a Mirror Langmuir Probe LaBombard, B.; Golfinopoulos, T.; Terry, J. L. Physics of Plasmas, Vol. 21, Issue 5 https://doi.org/10.1063/1.4873918	journal	May 2014
20 years of research on the Alcator C-Mod tokamaka) Greenwald, M.; Bader, A.; Baek, S. Physics of Plasmas, Vol. 21, Issue 11 https://doi.org/10.1063/1.4901920	journal	November 2014
Poloidal asymmetries in edge transport barriersa) Churchill, R. M.; Theiler, C.; Lipschultz, B. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4918353	journal	May 2015
First results from Alcator‐C‐MOD* Hutchinson, I. H.; Boivin, R.; Bombarda, F. Physics of Plasmas, Vol. 1, Issue 5 https://doi.org/10.1063/1.870701	journal	May 1994
Radiofrequency-heated enhanced confinement modes in the Alcator C-Mod tokamak Takase, Y.; Boivin, R. L.; Bombarda, F. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872269	journal	May 1997
Fusion plasma experiments on TFTR: A 20 year retrospective Hawryluk, R. J.; Batha, S.; Blanchard, W. Physics of Plasmas, Vol. 5, Issue 5 https://doi.org/10.1063/1.872825	journal	May 1998
Neoclassical transport of impurities in tokamak plasmas Hirshman, S. P.; Sigmar, D. J. Nuclear Fusion, Vol. 21, Issue 9 https://doi.org/10.1088/0029-5515/21/9/003	journal	September 1981
H mode power threshold database for ITER Snipes, J. A.; Granetz, R. S.; Greenwald, M. Nuclear Fusion, Vol. 36, Issue 9 https://doi.org/10.1088/0029-5515/36/9/I11	journal	September 1996
Higher fusion power gain with profile control in DIII-D tokamak plasmas Lazarus, E. A.; Navratil, G. A.; Greenfield, C. M. Nuclear Fusion, Vol. 37, Issue 1 https://doi.org/10.1088/0029-5515/37/1/I11	journal	January 1997
High fusion performance from deuterium-tritium plasmas in JET Keilhacker, M.; Gibson, A.; Gormezano, C. Nuclear Fusion, Vol. 39, Issue 2 https://doi.org/10.1088/0029-5515/39/2/306	journal	February 1999
Radial impurity transport in the H mode transport barrier region in Alcator C-Mod Pedersen, T. Sunn; Granetz, R. S.; Hubbard, A. E. Nuclear Fusion, Vol. 40, Issue 10 https://doi.org/10.1088/0029-5515/40/10/310	journal	October 2000
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
The dependence of core rotation on magnetic configuration and the relation to the H-mode power threshold in Alcator C-Mod plasmas with no momentum input Rice, J. E.; Hubbard, A. E.; Hughes, J. W. Nuclear Fusion, Vol. 45, Issue 4 https://doi.org/10.1088/0029-5515/45/4/005	journal	March 2005
I-mode: an H-mode energy confinement regime with L-mode particle transport in Alcator C-Mod Whyte, D. G.; Hubbard, A. E.; Hughes, J. W. Nuclear Fusion, Vol. 50, Issue 10 https://doi.org/10.1088/0029-5515/50/10/105005	journal	August 2010
A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model Snyder, P. B.; Groebner, R. J.; Hughes, J. W. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103016	journal	August 2011
ITER predictions using the GYRO verified and experimentally validated trapped gyro-Landau fluid transport model Kinsey, J. E.; Staebler, G. M.; Candy, J. Nuclear Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0029-5515/51/8/083001	journal	June 2011
Power requirements for superior H-mode confinement on Alcator C-Mod: experiments in support of ITER Hughes, J. W.; Loarte, A.; Reinke, M. L. Nuclear Fusion, Vol. 51, Issue 8 https://doi.org/10.1088/0029-5515/51/8/083007	journal	June 2011
Pedestal structure and stability in H-mode and I-mode: a comparative study on Alcator C-Mod Hughes, J. W.; Snyder, P. B.; Walk, J. R. Nuclear Fusion, Vol. 53, Issue 4 https://doi.org/10.1088/0029-5515/53/4/043016	journal	March 2013
Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER Eich, T.; Leonard, A. W.; Pitts, R. A. Nuclear Fusion, Vol. 53, Issue 9 https://doi.org/10.1088/0029-5515/53/9/093031	journal	August 2013
L–H power threshold studies in JET with Be/W and C wall Maggi, C. F.; Delabie, E.; Biewer, T. M. Nuclear Fusion, Vol. 54, Issue 2 https://doi.org/10.1088/0029-5515/54/2/023007	journal	January 2014
Experimental evidence for the key role of the ion heat channel in the physics of the L–H transition Ryter, F.; Barrera Orte, L.; Kurzan, B. Nuclear Fusion, Vol. 54, Issue 8 https://doi.org/10.1088/0029-5515/54/8/083003	journal	May 2014
Inboard and outboard radial electric field wells in the H- and I-mode pedestal of Alcator C-Mod and poloidal variations of impurity temperature Theiler, C.; Churchill, R. M.; Lipschultz, B. Nuclear Fusion, Vol. 54, Issue 8 https://doi.org/10.1088/0029-5515/54/8/083017	journal	June 2014
Quasi-coherent fluctuations limiting the pedestal growth on Alcator C-Mod: experiment and modelling Diallo, A.; Hughes, J. W.; Baek, S-G. Nuclear Fusion, Vol. 55, Issue 5 https://doi.org/10.1088/0029-5515/55/5/053003	journal	April 2015
Physics basis for compact ignition experiments Coppi, B.; Nassi, M.; Sugiyama, L. E. Physica Scripta, Vol. 45, Issue 2 https://doi.org/10.1088/0031-8949/45/2/010	journal	February 1992
The quasi-coherent signature of enhanced D _α H-mode in Alcator C-Mod Snipes, J. A.; LaBombard, B.; Greenwald, M. Plasma Physics and Controlled Fusion, Vol. 43, Issue 4 https://doi.org/10.1088/0741-3335/43/4/101	journal	March 2001
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
Physics and performance of the I-mode regime over an expanded operating space on Alcator C-Mod Hubbard, A. E.; Baek, S. -G.; Brunner, D. Nuclear Fusion, Vol. 57, Issue 12 https://doi.org/10.1088/1741-4326/aa8570	journal	October 2017
Influence of high magnetic field on access to stationary H-modes and pedestal characteristics in Alcator C-Mod Tolman, E. A.; Hughes, J. W.; Wolfe, S. M. Nuclear Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/1741-4326/aaa8cc	journal	February 2018
Power requirement for accessing the H-mode in ITER Martin, Y. R.; Takizuka, T.; Group, the ITPA CDBM H-mode Threshold Data Journal of Physics: Conference Series, Vol. 123 https://doi.org/10.1088/1742-6596/123/1/012033	journal	July 2008
Access to a New Plasma Edge State with High Density and Pressures using the Quiescent H Mode Solomon, W. M.; Snyder, P. B.; Burrell, K. H. Physical Review Letters, Vol. 113, Issue 13 https://doi.org/10.1103/PhysRevLett.113.135001	journal	September 2014
Experimental and Theoretical Study of Quasicoherent Fluctuations in Enhanced D α Plasmas in the Alcator C-Mod Tokamak Mazurenko, A.; Porkolab, M.; Mossessian, D. Physical Review Letters, Vol. 89, Issue 22 https://doi.org/10.1103/PhysRevLett.89.225004	journal	November 2002
The Alcator C-Mod Program Marmar, E. S.; Group, Alcator C-Mod Fusion Science and Technology, Vol. 51, Issue 3 https://doi.org/10.13182/FST07-A1421	journal	April 2007
Confinement and Transport Research in Alcator C-Mod Greenwald, M.; Basse, N.; Bonoli, P. Fusion Science and Technology, Vol. 51, Issue 3 https://doi.org/10.13182/FST07-A1422	journal	April 2007
H-Mode Pedestal and L-H Transition Studies on Alcator C-Mod Hughes, J. W.; Hubbard, A. E.; Mossessian, D. A. Fusion Science and Technology, Vol. 51, Issue 3 https://doi.org/10.13182/FST07-A1425	journal	April 2007
I. Burning Plasma Experiment Physics Design Description Goldston, R. J. Fusion Technology, Vol. 21, Issue 3P1 https://doi.org/10.13182/FST92-A29891	journal	May 1992
ZEPHYR, the Concept of a Compact Ignition Experiment Andelfinger, C.; Kaufmann, M.; Köppendörfer, W. Zeitschrift für Naturforschung A, Vol. 37, Issue 8 https://doi.org/10.1515/zna-1982-0826	journal	January 1982
ARC: A compact, high-field, fusion nuclear science facility and demonstration power plant with demountable magnets Sorbom, B. N.; Ball, J.; Palmer, T. R. arXiv https://doi.org/10.48550/arxiv.1409.3540	text	January 2014

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