Effects of heating power on divertor in-out asymmetry and scrape-off layer flow in reversed field on Experimental Advanced Superconducting Tokamak

Liu, S. C.; Guo, H. Y.; Wang, L.; Wang, H. Q.; Gan, K. F.; Xia, T. Y.; Xu, G. S.; Xu, X. Q.; Liu, Z. X.; Chen, L.; Yan, N.; Zhang, W.; Chen, R.; Shao, L. M.; Ding, S.; Hu, G. H.; Liu, Y. L.; Zhao, N.; Li, Y. L.; Gong, X. Z.; Gao, X.

doi:10.1063/1.4904205

Effects of heating power on divertor in-out asymmetry and scrape-off layer flow in reversed field on Experimental Advanced Superconducting Tokamak

Journal Article · Fri Dec 12 00:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4904205· OSTI ID:1959641

Liu, S. C. ^[1]; Guo, H. Y. ^[2]; Wang, L. ^[3]; Wang, H. Q. ^[1]; Gan, K. F. ^[1]; Xia, T. Y. ^[1]; Xu, G. S. ^[1]; ^[4]; Liu, Z. X. ^[1]; Chen, L. ^[1]; Yan, N. ^[5]; Zhang, W. ^[1]; Chen, R. ^[1]; Shao, L. M. ^[1]; Ding, S. ^[1]; Hu, G. H. ^[1]; Liu, Y. L. ^[1]; Zhao, N. ^[1]; ^[1]; Gong, X. Z. ^[1] more »

Chinese Academy of Sciences (CAS), Hefei (China)
Chinese Academy of Sciences (CAS), Hefei (China); General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China); Dalian Univ. of Technology (China)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China); Association Euratom-Risø DTU, Roskilde (Denmark)

In this work, the dependence of divertor asymmetry and scrape-off layer (SOL) flow on heating power has been investigated in the Experimental Advanced Superconducting Tokamak (EAST). Divertor plasma exhibits an outboard-enhanced in-out asymmetry in heat flux in lower single null configuration for in reversed (ion ∇B drift direction toward the upper X-point) field directions. Upper single null exhibits an inboard-favored asymmetry in low heating power condition, while exhibits an outboard-favored asymmetry when increasing the heating power. Double null has the strongest in-out asymmetry in heat flux, favoring the outer divertor. The in-out asymmetry ratios of P_out/P_total and q_t,out/q_t,total increase with the power across the separatrix P_loss, which is probably induced by the enhanced radial particle transport due to a large pressure gradient. The characteristics of the measured SOL parallel flow under various discharge conditions are consistent with the Pfirsch-Schlüter (PS) flow with the parallel Mach number M_∥ decreasing with the line averaged density but increasing with P_loss, in the same direction as the PS flow. The contributions of both poloidal E×B drift and parallel flow on poloidal particle transport in SOL on EAST are also assessed.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: National Magnetic Confinement Fusion Research Program of China; National Natural Science Foundation of China (NSFC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1959641

Alternate ID(s):: OSTI ID: 22403359

Report Number(s):: LLNL-JRNL-844646; 1068075

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 21; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

References (56)

Modelling of SOL Flows and Target Asymmetries in JET Field Reversal Experiments with EDGE2D Code Chankin, A. V.; Coad, J. P.; Corrigan, G. Contributions to Plasma Physics, Vol. 40, Issue 3-4 https://doi.org/10.1002/1521-3986(200006)40:3/4<288::AID-CTPP288>3.0.CO;2-6	journal	June 2000
Measured plasma parameters in TdeV's closed poloidal divertors Stansfield, B. L.; Boucher, C.; Gunn, J. P. Journal of Nuclear Materials, Vol. 220-222 https://doi.org/10.1016/0022-3115(94)00486-2	journal	April 1995
Field reversal effects on particle and heat fluxes in divertor on JT-60U Asakura, N.; Itami, K.; Hosogane, N. Journal of Nuclear Materials, Vol. 220-222 https://doi.org/10.1016/0022-3115(94)00639-3	journal	April 1995
The effect of divertor magnetic balance on H-mode performance in DIII-D Petrie, T. W.; Greenfield, C. M.; Grobener, R. J. Journal of Nuclear Materials, Vol. 290-293 https://doi.org/10.1016/S0022-3115(00)00492-X	journal	March 2001
Plasma flow measurement in high- and low-field-side SOL and influence on the divertor plasma in JT-60U Asakura, N.; Sakurai, S.; Itami, K. Journal of Nuclear Materials, Vol. 313-316 https://doi.org/10.1016/S0022-3115(02)01446-0	journal	March 2003
Experimental investigation of transport phenomena in the scrape-off layer and divertor Labombard, B.; Goetz, J. A.; Hutchinson, I. Journal of Nuclear Materials, Vol. 241-243 https://doi.org/10.1016/S0022-3115(97)80037-2	journal	February 1997
Measurements of flows in the DIII-D divertor by Mach probes Boedo, J. A.; Lehmer, R.; Moyer, R. A. Journal of Nuclear Materials, Vol. 266-269 https://doi.org/10.1016/S0022-3115(98)00549-2	journal	March 1999
Influence of and ∇B drift terms in 2-D edge/SOL transport simulations Rognlien, T. D.; Porter, G. D.; Ryutov, D. D. Journal of Nuclear Materials, Vol. 266-269 https://doi.org/10.1016/S0022-3115(98)00835-6	journal	March 1999
BOUT++: A framework for parallel plasma fluid simulations Dudson, B. D.; Umansky, M. V.; Xu, X. Q. Computer Physics Communications, Vol. 180, Issue 9 https://doi.org/10.1016/j.cpc.2009.03.008	journal	September 2009
Improvement of divertor triple probe system and its measurements under full graphite wall on EAST Ming, Tingfeng; Zhang, Wei; Chang, Jiafeng Fusion Engineering and Design, Vol. 84, Issue 1 https://doi.org/10.1016/j.fusengdes.2008.10.005	journal	January 2009
The first in-vessel cryopump for EAST divertor experiment Hu, Q. S.; Yao, D. M.; Luo, G. N. Fusion Engineering and Design, Vol. 85, Issue 7-9 https://doi.org/10.1016/j.fusengdes.2010.04.015	journal	December 2010
EDGE2D code simulations of SOL flows and in–out divertor asymmetries in JET Kirnev, G. S.; Corrigan, G.; Coster, D. Journal of Nuclear Materials, Vol. 337-339 https://doi.org/10.1016/j.jnucmat.2004.09.032	journal	March 2005
The effect of field reversal on the JET MkIIGB-SRP divertor performance in L-mode density limit discharges Huber, A.; Rapp, J.; Andrew, P. Journal of Nuclear Materials, Vol. 337-339 https://doi.org/10.1016/j.jnucmat.2004.10.123	journal	March 2005
Deuterium plasma flow in the scrape-off layer of ASDEX Upgrade Müller, H. W.; Bobkov, V.; Herrmann, A. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2006.12.054	journal	June 2007
Parallel SOL flow on TCV Pitts, R. A.; Horacek, J.; Fundamenski, W. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2006.12.065	journal	June 2007
Divertor power deposition and target current asymmetries during type-I ELMs in ASDEX Upgrade and JET Eich, T.; Kallenbach, A.; Pitts, R. A. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2007.01.240	journal	June 2007
Examination of the velocity time-delay-estimation technique Yu, J. H.; Holland, C.; Tynan, G. R. Journal of Nuclear Materials, Vol. 363-365 https://doi.org/10.1016/j.jnucmat.2007.01.253	journal	June 2007
Detailed comparison of simulated and measured plasma profiles in the scrape-off layer and edge plasma of DIII-D Porter, G. D.; Isler, R.; Boedo, J. Physics of Plasmas, Vol. 7, Issue 9 https://doi.org/10.1063/1.1286509	journal	September 2000
Mach probe interpretation in the presence of suprathermal electrons Gunn, J. P.; Fuchs, V. Physics of Plasmas, Vol. 14, Issue 3 https://doi.org/10.1063/1.2672896	journal	March 2007
Fast scanning probe for the NSTX spherical tokamak Boedo, J. A.; Crocker, N.; Chousal, L. Review of Scientific Instruments, Vol. 80, Issue 12 https://doi.org/10.1063/1.3266065	journal	December 2009
Estimation of wavenumber and frequency spectra using fixed probe pairs Beall, J. M.; Kim, Y. C.; Powers, E. J. Journal of Applied Physics, Vol. 53, Issue 6 https://doi.org/10.1063/1.331279	journal	June 1982
Fast reciprocating probe system on the EAST superconducting tokamak Zhang, W.; Chang, J. F.; Wan, B. N. Review of Scientific Instruments, Vol. 81, Issue 11 https://doi.org/10.1063/1.3499237	journal	November 2010
Influence of helium puff on divertor asymmetry in Experimental Advanced Superconducting Tokamak Liu, S. C.; Guo, H. Y.; Xu, G. S. Physics of Plasmas, Vol. 21, Issue 2 https://doi.org/10.1063/1.4863843	journal	February 2014
Transition from resistive ballooning to ηi driven turbulence in tokamaks Zeiler, A.; Biskamp, D.; Drake, J. F. Physics of Plasmas, Vol. 5, Issue 7 https://doi.org/10.1063/1.872953	journal	July 1998
Field reversal effects on divertor plasmas under radiative and detached conditions in JT-60U Asakura, N.; Hosogane, H.; Tsuji-Iio, S. Nuclear Fusion, Vol. 36, Issue 6 https://doi.org/10.1088/0029-5515/36/6/I10	journal	June 1996
Simple models for the radial and poloidal E × B drifts in the scrape-off layer of a divertor tokamak: Effects on in/out asymmetries Stangeby, P. C.; Chankin, A. V. Nuclear Fusion, Vol. 36, Issue 7 https://doi.org/10.1088/0029-5515/36/7/I02	journal	July 1996
Heat and particle transport of SOL and divertor plasmas in the W shaped divertor on JT-60U Asakura, N.; Sakurai, S.; Hosogane, N. Nuclear Fusion, Vol. 39, Issue 11Y https://doi.org/10.1088/0029-5515/39/11Y/344	journal	November 1999
Transport-driven Scrape-Off-Layer flows and the boundary conditions imposed at the magnetic separatrix in a tokamak plasma LaBombard, B.; Rice, J. E.; Hubbard, A. E. Nuclear Fusion, Vol. 44, Issue 10 https://doi.org/10.1088/0029-5515/44/10/001	journal	September 2004
Driving mechanism of sol plasma flow and effects on the divertor performance in JT-60U Asakura, N.; Takenaga, H.; Sakurai, S. Nuclear Fusion, Vol. 44, Issue 4 https://doi.org/10.1088/0029-5515/44/4/004	journal	March 2004
ELM-averaged power exhaust on JET Fundamenski, W.; Pitts, R. A.; Matthews, G. F. Nuclear Fusion, Vol. 45, Issue 8 https://doi.org/10.1088/0029-5515/45/8/024	journal	August 2005
ELM transport in the JET scrape-off layer Pitts, R. A.; Andrew, P.; Arnoux, G. Nuclear Fusion, Vol. 47, Issue 11 https://doi.org/10.1088/0029-5515/47/11/005	journal	October 2007
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
A possible role of radial electric field in driving parallel ion flow in scrape-off layer of divertor tokamaks Chankin, A. V.; Coster, D. P.; Asakura, N. Nuclear Fusion, Vol. 47, Issue 8 https://doi.org/10.1088/0029-5515/47/8/006	journal	July 2007
Impurity behaviour under puff-and-pump radiating divertor conditions Petrie, T. W.; Porter, G. D.; Brooks, N. H. Nuclear Fusion, Vol. 49, Issue 6 https://doi.org/10.1088/0029-5515/49/6/065013	journal	May 2009
Nonlinear ELM simulations based on a nonideal peeling–ballooning model using the BOUT++ code Xu, X. Q.; Dudson, B. D.; Snyder, P. B. Nuclear Fusion, Vol. 51, Issue 10 https://doi.org/10.1088/0029-5515/51/10/103040	journal	September 2011
Outer divertor of ASDEX Upgrade in low-density L-mode discharges in forward and reversed magnetic field: I. Comparison between measured plasma conditions and SOLPS5.0 code calculations Aho-Mantila, L.; Wischmeier, M.; Müller, H. W. Nuclear Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0029-5515/52/10/103006	journal	August 2012
Outer divertor of ASDEX Upgrade in low-density L-mode discharges in forward and reversed magnetic field: II. Analysis of local impurity migration Aho-Mantila, L.; Wischmeier, M.; Krieger, K. Nuclear Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0029-5515/52/10/103007	journal	August 2012
Contribution of $\vec {E}\times \vec {B}$ drifts and parallel currents to divertor asymmetries Rozhansky, V.; Molchanov, P.; Veselova, I. Nuclear Fusion, Vol. 52, Issue 10 https://doi.org/10.1088/0029-5515/52/10/103017	journal	September 2012
Particle and power deposition on divertor targets in EAST H-mode plasmas Wang, L.; Xu, G. S.; Guo, H. Y. Nuclear Fusion, Vol. 52, Issue 6 https://doi.org/10.1088/0029-5515/52/6/063024	journal	May 2012
Transport and drift-driven plasma flow components in the Alcator C-Mod boundary plasma Smick, N.; LaBombard, B.; Hutchinson, I. H. Nuclear Fusion, Vol. 53, Issue 2 https://doi.org/10.1088/0029-5515/53/2/023001	journal	January 2013
Characterizations of power loads on divertor targets for type-I, compound and small ELMs in the EAST superconducting tokamak Wang, L.; Xu, G. S.; Guo, H. Y. Nuclear Fusion, Vol. 53, Issue 7 https://doi.org/10.1088/0029-5515/53/7/073028	journal	June 2013
Toroidal field reversal effects on divertor asymmetries in JET Chankin, A. V.; Campbell, D. J.; Clement, S. Plasma Physics and Controlled Fusion, Vol. 38, Issue 9 https://doi.org/10.1088/0741-3335/38/9/004	journal	September 1996
Experimental divertor physics Pitcher, C. S.; Stangeby, P. C. Plasma Physics and Controlled Fusion, Vol. 39, Issue 6 https://doi.org/10.1088/0741-3335/39/6/001	journal	June 1997
Parallel flow in the JET scrape-off layer Erents, S. K.; Chankin, A. V.; Matthews, G. F. Plasma Physics and Controlled Fusion, Vol. 42, Issue 8 https://doi.org/10.1088/0741-3335/42/8/304	journal	August 2000
Particle control and SOL plasma flow in the W-shaped divertor of JT-60U tokamak Asakura, N.; Takenaga, H.; Sakurai, S. Plasma Physics and Controlled Fusion, Vol. 44, Issue 10 https://doi.org/10.1088/0741-3335/44/10/303	journal	September 2002
A comparison of experimental measurements and code results to determine flows in the JET SOL Erents, S. K.; Pitts, R. A.; Fundamenski, W. Plasma Physics and Controlled Fusion, Vol. 46, Issue 11 https://doi.org/10.1088/0741-3335/46/11/006	journal	September 2004
Divertor plasma flow near the lower x-point in ASDEX Upgrade Tsalas, M.; Herrmann, A.; Kallenbach, A. Plasma Physics and Controlled Fusion, Vol. 49, Issue 6 https://doi.org/10.1088/0741-3335/49/6/012	journal	May 2007
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
Predictions for EAST Divertor Performance Sizheng, Zhu; Hiwatari, R.; Hatayama, A. Plasma Science and Technology, Vol. 8, Issue 1 https://doi.org/10.1088/1009-0630/8/1/28	journal	January 2006
Nonlinear Simulations of Peeling-Ballooning Modes with Anomalous Electron Viscosity and their Role in Edge Localized Mode Crashes Xu, X. Q.; Dudson, B.; Snyder, P. B. Physical Review Letters, Vol. 105, Issue 17 https://doi.org/10.1103/PhysRevLett.105.175005	journal	October 2010
Mean and Oscillating Plasma Flows and Turbulence Interactions across the L − H Confinement Transition Conway, G. D.; Angioni, C.; Ryter, F. Physical Review Letters, Vol. 106, Issue 6 https://doi.org/10.1103/PhysRevLett.106.065001	journal	February 2011
First Evidence of the Role of Zonal Flows for the L − H Transition at Marginal Input Power in the EAST Tokamak Xu, G. S.; Wan, B. N.; Wang, H. Q. Physical Review Letters, Vol. 107, Issue 12 https://doi.org/10.1103/PhysRevLett.107.125001	journal	September 2011
Frequency-Resolved Nonlinear Turbulent Energy Transfer into Zonal Flows in Strongly Heated L -Mode Plasmas in the HL-2A Tokamak Xu, M.; Tynan, G. R.; Diamond, P. H. Physical Review Letters, Vol. 108, Issue 24 https://doi.org/10.1103/PhysRevLett.108.245001	journal	June 2012
Magnetic Topology Changes Induced by Lower Hybrid Waves and their Profound Effect on Edge-Localized Modes in the EAST Tokamak Liang, Y.; Gong, X. Z.; Gan, K. F. Physical Review Letters, Vol. 110, Issue 23 https://doi.org/10.1103/PhysRevLett.110.235002	journal	June 2013
Measurement of Natural Plasma Flow along the Field Lines in the Scrape-Off Layer on the JT-60U Divertor Tokamak Asakura, N.; Sakurai, S.; Shimada, M. Physical Review Letters, Vol. 84, Issue 14 https://doi.org/10.1103/PhysRevLett.84.3093	journal	April 2000
The Plasma Boundary of Magnetic Fusion Devices Stangeby, Peter C. Plasma Physics and Controlled Fusion, Vol. 43, Issue 2 https://doi.org/10.1887/0750305592	book	January 2000

Similar Records

Effects of heating power on divertor in-out asymmetry and scrape-off layer flow in reversed field on Experimental Advanced Superconducting Tokamak

Journal Article · Sun Dec 14 23:00:00 EST 2014 · Physics of Plasmas · OSTI ID:22403359

Effect on the divertor and scrape-off layer plasma properties of the distribution of power and particle influxes from the core

Journal Article · Sun Mar 15 00:00:00 EDT 2009 · Physics of Plasmas · OSTI ID:21274182

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Effects of heating power on divertor in-out asymmetry and scrape-off layer flow in reversed field on Experimental Advanced Superconducting Tokamak

Citation Formats

References (56)

Similar Records

Related Subjects