Computational analysis of ion orbital loss in diverted positive- and negative-triangularity tokamaks

Nishimura, Y.; Waelbroeck, F. L.; Zheng, L. J.

doi:10.1063/1.5131157

Title: Computational analysis of ion orbital loss in diverted positive- and negative-triangularity tokamaks

Journal Article · 16 January 2020 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5131157 · OSTI ID:1787333

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National Cheng Kung Univ., Tainan City (Taiwan); Institute for Fusion Studies, University of Texas at Austin
Univ. of Texas, Austin, TX (United States). Institute for Fusion Studies

The mechanism of ion orbital loss in diverted negative-triangularity (NT) tokamaks is significantly different from that of positive-triangularity (PT) tokamaks. The orbital loss from the edge of NT tokamaks can be quite large, because the separatrix X-point is located on the outboard side, meaning that trapped ions crossing the separatrix are lost to the inboard divertor plate after a mirror reflection on the side of the strong magnetic field. NT tokamaks have difficulties in building up steep pressure gradients in the edge regions. However, the majority of trapped ions crossing the separatrix in PT tokamaks survive (through complete banana motions) without reaching the X-point region. For NT tokamaks, topological changes in the trapped ion trajectories can be achieved in the presence of the radial electric field, thus reducing the orbital loss, whereas for PT tokamaks, the orbital loss is relatively insensitive to the radial electric field.

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Research Organization:: Univ. of Texas, Austin, TX (United States). Institute for Fusion Studies

Sponsoring Organization:: Taiwan Ministry of Science and Technology; USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-04ER54742

OSTI ID:: 1787333

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (53)

A finite element Poisson solver for gyrokinetic particle simulations in a global field aligned mesh Nishimura, Y.; Lin, Z.; Lewandowski, J. L. V. Journal of Computational Physics, Vol. 214, Issue 2 https://doi.org/10.1016/j.jcp.2005.10.011	journal	May 2006
Discontinuous Galerkin methods for plasma physics in the scrape-off layer of tokamaks Michoski, C.; Meyerson, D.; Isaac, T. Journal of Computational Physics, Vol. 274 https://doi.org/10.1016/j.jcp.2014.06.058	journal	October 2014
Variational principles of guiding centre motion Littlejohn, Robert G. Journal of Plasma Physics, Vol. 29, Issue 1 https://doi.org/10.1017/S002237780000060X	journal	February 1983
Characterization of electrostatic turbulent fluxes in tokamak edge plasmas Nishimura, Y.; Coster, D.; Scott, B. Physics of Plasmas, Vol. 11, Issue 1 https://doi.org/10.1063/1.1631811	journal	January 2004
Equation of State Calculations by Fast Computing Machines Metropolis, Nicholas; Rosenbluth, Arianna W.; Rosenbluth, Marshall N. The Journal of Chemical Physics, Vol. 21, Issue 6 https://doi.org/10.1063/1.1699114	journal	June 1953
The Stellarator Concept Spitzer, Lyman Physics of Fluids, Vol. 1, Issue 4 https://doi.org/10.1063/1.1705883	journal	January 1958
Property of an X-point generated velocity-space hole in a diverted tokamak plasma edge Ku, Seunghoe; Baek, Hoyul; Chang, C. S. Physics of Plasmas, Vol. 11, Issue 12 https://doi.org/10.1063/1.1812273	journal	December 2004
Measurements of core electron temperature and density fluctuations in DIII-D and comparison to nonlinear gyrokinetic simulations White, A. E.; Schmitz, L.; McKee, G. R. Physics of Plasmas, Vol. 15, Issue 5 https://doi.org/10.1063/1.2895408	journal	May 2008
Measurements of the cross-phase angle between density and electron temperature fluctuations and comparison with gyrokinetic simulations White, A. E.; Peebles, W. A.; Rhodes, T. L. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3323084	journal	May 2010
“One size fits all” analytic solutions to the Grad–Shafranov equation Cerfon, Antoine J.; Freidberg, Jeffrey P. Physics of Plasmas, Vol. 17, Issue 3 https://doi.org/10.1063/1.3328818	journal	March 2010
The effects of plasma shape control on the edge collisionless ion orbit loss Wu, G. J.; Zhang, X. D.; Li, Y. D. Physics of Plasmas, Vol. 20, Issue 10 https://doi.org/10.1063/1.4825126	journal	October 2013
Effect of the plasma shapes on intrinsic rotation due to collisionless ion orbit loss in the tokamak edge plasmas Ou, Jing; Wu, Guojiang; Li, Xinxia Physics of Plasmas, Vol. 21, Issue 7 https://doi.org/10.1063/1.4889898	journal	July 2014
X-point position dependence of edge intrinsic toroidal rotation on the Tokamak à Configuration Variablea) Stoltzfus-Dueck, T.; Karpushov, A. N.; Sauter, O. Physics of Plasmas, Vol. 22, Issue 5 https://doi.org/10.1063/1.4921158	journal	May 2015
H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D Marinoni, A.; Austin, M. E.; Hyatt, A. W. Physics of Plasmas, Vol. 26, Issue 4 https://doi.org/10.1063/1.5091802	journal	April 2019
Self‐consistent radial sheath Hazeltine, R. D. Physics of Fluids B: Plasma Physics, Vol. 1, Issue 10 https://doi.org/10.1063/1.859067	journal	October 1989
Influence of sheared poloidal rotation on edge turbulence Biglari, H.; Diamond, P. H.; Terry, P. W. Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1 https://doi.org/10.1063/1.859529	journal	January 1990
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices Burrell, K. H. Physics of Plasmas, Vol. 4, Issue 5 https://doi.org/10.1063/1.872367	journal	May 1997
Two-dimensional electric fields and drifts near the magnetic separatrix in divertor tokamaks Rognlien, T. D.; Ryutov, D. D.; Mattor, N. Physics of Plasmas, Vol. 6, Issue 5 https://doi.org/10.1063/1.873488	journal	May 1999
Neoclassical transport effects and the H-mode transition Hinton, F. L. Nuclear Fusion, Vol. 25, Issue 10 https://doi.org/10.1088/0029-5515/25/10/008	journal	October 1985
Neoclassical ion transport through the separatrix in divertor tokamaks Hinton, F. L.; Chu, M. S. Nuclear Fusion, Vol. 25, Issue 3 https://doi.org/10.1088/0029-5515/25/3/010	journal	March 1985
Model of the H-mode in tokamaks Itoh, S. -I.; Itoh, K. Nuclear Fusion, Vol. 29, Issue 6 https://doi.org/10.1088/0029-5515/29/6/013	journal	June 1989
Loss ion orbits at the tokamak edge Chankin, A. V.; McCracken, G. M. Nuclear Fusion, Vol. 33, Issue 10 https://doi.org/10.1088/0029-5515/33/10/I05	journal	October 1993
Direct ion orbit loss near the plasma edge of a divertor tokamak in the presence of a radial electric field Miyamoto, K. Nuclear Fusion, Vol. 36, Issue 7 https://doi.org/10.1088/0029-5515/36/7/I09	journal	July 1996
Test particle simulation of non-ambipolar ion diffusion in tokamaks Kiviniemi, T. P.; Heikkinen, J. A.; Peeters, A. G. Nuclear Fusion, Vol. 40, Issue 9 https://doi.org/10.1088/0029-5515/40/9/303	journal	September 2000
Simulation of tokamak edge plasma including self-consistent electric fields Rozhansky, V. A.; Voskoboynikov, S. P.; Kaveeva, E. G. Nuclear Fusion, Vol. 41, Issue 4 https://doi.org/10.1088/0029-5515/41/4/305	journal	April 2001
Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas Camenen, Y.; Pochelon, A.; Behn, R. Nuclear Fusion, Vol. 47, Issue 7 https://doi.org/10.1088/0029-5515/47/7/002	journal	June 2007
Intrinsic toroidal velocity near the edge of DIII-D H-mode plasmas deGrassie, J. S.; Groebner, R. J.; Burrell, K. H. Nuclear Fusion, Vol. 49, Issue 8 https://doi.org/10.1088/0029-5515/49/8/085020	journal	July 2009
Recent progress in RF heating and long-pulse experiments on EAST Li, Jiangang; Wan, Baonian Nuclear Fusion, Vol. 51, Issue 9 https://doi.org/10.1088/0029-5515/51/9/094007	journal	August 2011
Hydrogen isotope effects on ITG scale length, pedestal and confinement in JT-60 H-mode plasmas Urano, H.; Takizuka, T.; Aiba, N. Nuclear Fusion, Vol. 53, Issue 8 https://doi.org/10.1088/0029-5515/53/8/083003	journal	July 2013
Alpha particle transport in the presence of ballooning type electrostatic driftwaves Nishimura, Y.; Huang, B.; Cheng, C. Z. Nuclear Fusion, Vol. 55, Issue 7 https://doi.org/10.1088/0029-5515/55/7/073016	journal	June 2015
Thermodynamic stability of anomalous drift wave transport Horton, W. Plasma Physics, Vol. 22, Issue 4 https://doi.org/10.1088/0032-1028/22/4/005	journal	April 1980
MHD-Limits to Plasma Confinement Troyon, F.; Gruber, R.; Saurenmann, H. Plasma Physics and Controlled Fusion, Vol. 26, Issue 1A https://doi.org/10.1088/0741-3335/26/1A/319	journal	January 1984
Marginal -limit for neoclassical tearing modes in JET H-mode discharges Sauter, O.; Buttery, R. J.; Felton, R. Plasma Physics and Controlled Fusion, Vol. 44, Issue 9 https://doi.org/10.1088/0741-3335/44/9/315	journal	August 2002
Edge radial electric field structure in quiescent H-mode plasmas in the DIII-D tokamak Burrell, K. H.; West, W. P.; Doyle, E. J. Plasma Physics and Controlled Fusion, Vol. 46, Issue 5A https://doi.org/10.1088/0741-3335/46/5A/018	journal	April 2004
Plasma rotation profile measurements using Doppler reflectometry Conway, G. D.; Schirmer, J.; Klenge, S. Plasma Physics and Controlled Fusion, Vol. 46, Issue 6 https://doi.org/10.1088/0741-3335/46/6/003	journal	April 2004
Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET Lerche, E.; Eester, D. Van; Johnson, T. J. Plasma Physics and Controlled Fusion, Vol. 54, Issue 7 https://doi.org/10.1088/0741-3335/54/7/074008	journal	June 2012
A Dip Structure in the Intrinsic Toroidal Rotation Near the Edge of the Ohmic Plasmas in EAST Xu, Guosheng; Wan, Baonian; Guo, Houyang Plasma Science and Technology, Vol. 13, Issue 4 https://doi.org/10.1088/1009-0630/13/4/03	journal	August 2011
L-mode-edge negative triangularity tokamak reactor Kikuchi, M.; Takizuka, T.; Medvedev, S. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab076d	journal	April 2019
X -Point-Position-Dependent Intrinsic Toroidal Rotation in the Edge of the TCV Tokamak Stoltzfus-Dueck, T.; Karpushov, A. N.; Sauter, O. Physical Review Letters, Vol. 114, Issue 24 https://doi.org/10.1103/PhysRevLett.114.245001	journal	June 2015
Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak Austin, M. E.; Marinoni, A.; Walker, M. L. Physical Review Letters, Vol. 122, Issue 11 https://doi.org/10.1103/PhysRevLett.122.115001	journal	March 2019
Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak Wagner, F.; Becker, G.; Behringer, K. Physical Review Letters, Vol. 49, Issue 19 https://doi.org/10.1103/PhysRevLett.49.1408	journal	November 1982
Model of L to H -Mode Transition in Tokamak Itoh, Sanae-I.; Itoh, Kimitaka Physical Review Letters, Vol. 60, Issue 22 https://doi.org/10.1103/PhysRevLett.60.2276	journal	May 1988
Bifurcation theory of poloidal rotation in tokamaks: A model for L-H transition Shaing, K.; Crume, E. Physical Review Letters, Vol. 63, Issue 21 https://doi.org/10.1103/PhysRevLett.63.2369	journal	November 1989
Role of edge electric field and poloidal rotation in the L - H transition Groebner, R. J.; Burrell, K. H.; Seraydarian, R. P. Physical Review Letters, Vol. 64, Issue 25 https://doi.org/10.1103/PhysRevLett.64.3015	journal	June 1990
Self-Regulating Shear Flow Turbulence: A Paradigm for the L to H Transition Diamond, P. H.; Liang, Y. -M.; Carreras, B. A. Physical Review Letters, Vol. 72, Issue 16 https://doi.org/10.1103/PhysRevLett.72.2565	journal	April 1994
Neoclassical Radial Current Balance in Tokamaks and Transition to the H Mode Heikkinen, J. A.; Kiviniemi, T. P.; Peeters, A. G. Physical Review Letters, Vol. 84, Issue 3 https://doi.org/10.1103/PhysRevLett.84.487	journal	January 2000
Discharge From Hot Cao Child, C. D. Physical Review (Series I), Vol. 32, Issue 5 https://doi.org/10.1103/PhysRevSeriesI.32.492	journal	May 1911
Coulomb Collisional Relaxation Process of Ion Beams in Magnetized Plasmas Nishimura, Yasutaro IEEE Transactions on Plasma Science, Vol. 38, Issue 12 https://doi.org/10.1109/TPS.2010.2079958	journal	December 2010
Particle-in-Cell Simulation of Plasma Sheath Dynamics With Kinetic Ions Huang, Chun-Wei; Chen, Yen-Chiao; Nishimura, Yasutaro IEEE Transactions on Plasma Science, Vol. 43, Issue 2 https://doi.org/10.1109/TPS.2014.2382876	journal	February 2015
The Stellarator Concept Spitzer, Lyman IEEE Transactions on Plasma Science, Vol. 9, Issue 4 https://doi.org/10.1109/tps.1981.4317418	journal	January 1981
Ion Orbit Loss near Plasma Edge in Tokamak with Diverter Configuration Miyamoto, Kenro Journal of the Physical Society of Japan, Vol. 63, Issue 11 https://doi.org/10.1143/JPSJ.63.4017	journal	November 1994
Equation of state calculations by fast computing machines Metropolis, Nicholas; Rosenbluth, Arianna W.; Rosenbluth, Marshall N. https://doi.org/10.2172/4390578	report	March 1953
Coulomb collisional relaxation process of ion beams in magnetized plasmas Nishimura, Y. arXiv https://doi.org/10.48550/arxiv.1002.4906	text	January 2010

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Title: Computational analysis of ion orbital loss in diverted positive- and negative-triangularity tokamaks

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