Results 1 to 10 of about 2,271,409 (257)

Tungsten core accumulation study in EAST plasma with lower tungsten divertor by kinetic impurity transport model

Nuclear Materials and Energy, 2022
Tungsten (W) impurity transport and the corresponding core W accumulation is a critical issue in tokamak with W as plasma facing material. In this work, a kinetic W impurity transport code based on the guiding center approximation is applied for the ...
Yihan Wu, Qingrui Zhou, Chaofeng Sang, Yanjie Zhang, Yilin Wang, Dezhen Wang   +5 more
doaj   +3 more sources

Suppression of anomalous impurity transport in NBI-heated W7-X plasmas [PDF]

Nuclear Fusion, 2023
Radial impurity density profiles in two Wendelstein 7-X (W7-X) experiments heated by neutral beam injection (NBI) are analyzed with respect to their impurity transport properties.
T. Romba, F. Reimold, R.J.E. Jaspers, O.P. Ford, L. Vanó, T. Klinger, the W7-X Team   +6 more
doaj   +5 more sources

Controlling impurity transport in 5D gyrokinetic simulations using a transport barrier

Nuclear Fusion
The effects of transport barriers on impurity transport, specifically helium (He) and tungsten (W), are investigated using the global, flux-driven, full-F, 5D gyrokinetic code GYSELA.
G. Lo-Cascio, E. Gravier, M. Lesur, T. Réveillé, Y. Sarazin, X. Garbet, K. Lim, T. Rouyer, A. Guillevic   +8 more
doaj   +2 more sources

Enhancement of neoclassical impurity density up/down asymmetry and Pfirsch–Schlüter transport due to the plasma elongation in the tokamak plasmas

Nuclear Fusion, 2023
The standard neoclassical theory of the impurity transport in tokamak plasma is improved by including the plasma elongation effect. The neoclassical up/down asymmetry of the impurity density is largely enhanced by the plasma elongation and is under ...
Chengkang Pan
doaj   +1 more source

Observation of tearing mode triggering by sawtooth crash with high-Z impurity accumulation in EAST

AIP Advances, 2023
The high-Z impurity accumulation in the plasma core could degrade the plasma performance and may affect sawtooth crash and trigger tearing modes (TMs) in experimental advanced superconducting tokamak (EAST).
Shanshan Pan, Yanmin Duan, Liqing Xu, Yan Chao, Hailin Zhao, Haiqing Liu, Shouxin Wang, Ling Zhang, Yuqi Chu, Wenmin Zhang, Kaixuan Ye, Liqun Hu   +11 more
doaj   +1 more source

OEDGE modeling of far-SOL tungsten impurity sources and screening in WEST

Nuclear Materials and Energy, 2022
The plasma background and impurity transport in the scrape-off layer (SOL) of the WEST tokamak are modeled for three discharges over a Psep power scan ranging between 1.5 and 2.35 MW. An extended modeling grid is used to investigate far-SOL sourcing from
J.B. Maeker, J.H. Nichols, D.C. Donovan, A. Grosjean, J. Gunn, N. Fedorczak, C. Guillemaut, C.C. Klepper, E.A. Unterberg, D.C. Easley, WEST Team   +10 more
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A comprehensive study on impurity behavior in LHD long pulse discharges

Nuclear Materials and Energy, 2017
Impurity behavior is studied in a variety of LHD (Large Helical Device) long pulse discharges, i.e. standard hydrogen plasmas, super dense core plasmas, helium plasmas with ICH (Ion Cyclotron Frequency Heating), multi-species plasmas mixed with H and He.
Y. Nakamura, N. Tamura, M. Kobayashi, S. Yoshimura, C. Suzuki, M. Yoshinuma, M. Goto, G. Motojima, K. Nagaoka, K. Tanaka, R. Sakamoto, B.J. Peterson, K. Ida, M. Osakabe, T. Morisaki   +14 more
doaj   +1 more source

The transport of tungsten impurities induced by the intrinsic carbon during upper-single null discharge on EAST tokamak

Nuclear Materials and Energy, 2020
The transport as well as accumulation of tungsten (W) impurity is one of the critical issues for the W divertor operation. The EAST tokamak with W and graphite divertor targets, provides a good platform for the investigation of W impurity behaviors.
Qingrui Zhou, Chaofeng Sang, Guoliang Xu, Rui Ding, Xuele Zhao, Yilin Wang, Dezhen Wang   +6 more
doaj   +1 more source

Quantitative comparison of impurity transport in turbulence reduced and enhanced scenarios at Wendelstein 7-X

Nuclear Fusion, 2023
We assess the turbulent particle transport being responsible for the limitation of the confinement and, thus, the overall performance of the neoclassically optimized stellarator Wendelstein 7-X.
J.A. Alcusón, Th. Wegner, A. Dinklage, A. Langenberg, J.-P. Bähner, B. Buttenschön, E.M. Edlund, G. Fuchert, J.M. García-Regaña, O. Grulke, Z. Huang, M. Porkolab, A.V. Stechow, P. Xanthopoulos, A. Zocco, the W7-X Team   +15 more
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13C surface characterization of midplane and crown collector probes on DIII-D

Nuclear Materials and Energy, 2023
A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (13CD4) and sampled the impurities from this extrinsic, primary source with ...
J.D. Duran, D.C. Donovan, J.H. Nichols, E.A. Unterberg, S.A. Zamperini, T. Abrams, R. Perillo, J. Ren, D.L. Rudakov, M.W. Shafer, P.C. Stangeby, D.A. Taussig, R.S. Wilcox, M.P. Zach   +13 more
doaj   +1 more source