Results 11 to 20 of about 13,973,138 (276)

Overview of density pedestal structure: role of fueling versus transport

Nuclear Fusion, 2020
How much of the density pedestal structure is determined by fueling versus transport is still an open question. In most current tokamaks, the scrape-off layer is not opaque enough to screen the neutrals and limit their penetration past the separatrix. As
S. Mordijck
semanticscholar   +3 more sources

Influence of n = 4 RMPs on pedestal structure and stability in EAST

Nuclear Fusion
Changes of pedestal structure and stability caused by n = 4 resonant magnetic perturbations (RMPs) for control of Edge Localized Modes (ELMs) in the EAST tokamak in a target plasma close to the ITER high- Q scenario are studied in this paper.
X.M. Wu, Y. Sun, Q. Ma, S. Gu, Y.F. Wang, K.N. Geng, X.X. Zhang, G.Q. Li, H. Sheng, T. Zhang, P.B. Snyder, Q. Zhang, J. qian, Y.Y. Li, B. Wan   +14 more
doaj   +2 more sources

Study of the effect of the pedestal density profiles on the pedestal structure in EAST

Nuclear Fusion
Additional particle control methods, such as gas puffing, may lead to changes in the ratio between the separatrix electron density and the pedestal electron density ( $n_{\text{e}}^{{\text{sep}}}/n_{\text{e}}^{{\text{ped}}}$ ), and lead to the relative ...
Yanjie Yang, Kai Li, Tengfei Tang, Xiaoju Liu, Kangning Geng, Gongshun Li, Kedong Li, Xin Lin, Qing Zang, Xiaohe Wu, Haochen Fan, Wenjie Zhou, Xiang Gao, Guoqiang Li   +13 more
doaj   +2 more sources

Prediction of the kinetic profiles in H-mode plasma discharges on EAST using core-pedestal coupling [PDF]

Scientific Reports
The physical processes in tokamak plasma are strongly related to the coupling between the core and the pedestal. The accurate prediction of the kinetic profiles (electron temperature and density) from the pedestal to the core lays the physics basis for ...
Chaotong Yang, Kai Li, Guoqiang Li, Yanjie Yang, Xiang Jian, Lin Yu, Tao Zhang, Qing Zang, Haiqing Liu, Xin Lin, Jilei Hou   +10 more
doaj   +2 more sources

Prediction of DIII-D Pedestal Structure From Externally Controllable Parameters

IEEE Transactions on Plasma Science, 2021
The sharp increase of pressure at the edge of a high confinement mode (H-mode) plasma, the pedestal, strongly impacts overall plasma performance. Predicting the pedestal is a necessity to control and optimize tokamak operations.
Emi Zeger, F. Laggner, A. Bortolon, C. Rea, O. Meneghini, S. Saarelma, B. Sammuli, Sterling P. Smith, Jinjin Zhao   +8 more
semanticscholar   +2 more sources

Low collisionality, peeling limited pedestals in JET-ILW: effect of density and isotope mass on pedestal structure, pedestal stability and pedestal prediction in deuterium and mixed deuterium/tritium plasmas

Nuclear Fusion
Pedestals limited by peeling instabilities have been reached in JET-ILW by operating at high ${q_{95}}$ , up to ${q_{95}} = 8.5$ . The increase in ${q_{95}}$ via the increase of the toroidal field has stabilized the ballooning modes and has allowed to ...
L. Frassinetti, D. King, S. Saarelma, D. Keeling, C. Perez von Thun, C. Giroud, S. Wiesen, A. Kappatou, N. Vianello, E. Alessi, M. Brix, I.S. Carvalho, P. Carvalho, A. Chomiczewska, J.M. Fontdecaba, E. Giovannozzi, D. Kos, E. Kowalska, B. Labit, M. Lennholm, M. Maslov, A. Meigs, S. Menmuir, R.B. Morales, H. Nyström, E. Pawelec, G. Pucella, D. Silvagni, A. Stagni, H.J. Sun, JET Contributors, the EUROfusion Tokamak Exploitation Team   +31 more
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Impact of ionization and transport on pedestal density structure in DIII-D and Alcator C-Mod

Nuclear Fusion
This paper investigates the role of ionization on the pedestal structure using both measurements and modeling for H-mode plasmas on DIII-D and Alcator C-Mod to enhance our ability to predict pedestal behavior in future pilot plants.
S. Mordijck, R.A. Chaban, R. Reksoatmodjo, J.J. Balbin-Arias, Y. Chuang, J. Loughran, J.W. Hughes, A.M. Rosenthal, M.A. Miller, T. Wilks, F.M. Laggner, T. Osborne   +11 more
doaj   +2 more sources

Inter-ELM pedestal structure development in ASDEX Upgrade

, 2017
The performance of a magnetically confined, fusion plasma is strongly impacted by the plasma edge, which is the boundary between the hot, confined plasma and the reactor walls. In a tokamak, which uses a toroidally axis-symmetric magnetic field configuration, a regime of improved plasma confinement, the high confinement mode (H-mode), has been observed.
F. Laggner
semanticscholar   +5 more sources

SOL effects on the pedestal structure in DIII-D discharges

Nuclear Fusion, 2017
Analysis with the SOLPS code suite (Schneider R. et al 1992 J. Nucl. Mater. 196 810; Wiesen S. et al 2015 J. Nucl. Mater. 463 480–4; Bonnin X. et al 2016 Plasma Fusion Res. 11 1403102) explains the differences in pedestal structure associated with different ion drift directions in DIII-D.
A. Sontag, X. Chen, J. Canik, A. Leonard, J. Lore, A. Moser, M. Murakami, J.M. Park, C. Petty   +8 more
semanticscholar   +3 more sources

The role of isotope mass on neutral fueling and density pedestal structure in the DIII-D tokamak

Nuclear Fusion
Experimental measurements on DIII-D of hydrogen neutral penetration lengths ( $\lambda_{n_0}$ ) on the high field side (HFS) are longer by a factor of $\sqrt{2}$ than for deuterium consistent with the thermal velocity ratio for neutrals at the same ...
R.A. Chaban, S. Mordijck, A.M. Rosenthal, A. Bortolon, J.W. Hughes, M. Knolker, F.M. Laggner, T.H. Osborne, L. Schmitz, K.E. Thome, T.M. Wilks   +10 more
doaj   +2 more sources