Results 21 to 30 of about 5,366,310 (324)

Experiments and modelling of negative triangularity ASDEX Upgrade plasmas in view of DTT scenarios [PDF]

Plasma Physics and Controlled Fusion
The paper presents experimental and modelling results of a comparison of negative (NT) and positive (PT) triangularity ASDEX Upgrade (AUG) discharges using the plasma shapes presently foreseen in the DTT tokamak, under construction in Italy. This work is
L. Aucone, P. Mantica, T. Happel, J. Hobirk, T. Pütterich, B. Vanovac, C. F. B. Zimmermann, M. Bernert, T. Bolzonella, M. Cavedon, M. Dunne, R. Fischer, P. Innocente, A. Kappatou, R. M. McDermott, A. Mariani, P. Muscente, U. Plank, F. Sciortino, G. Tardini, the EUROfusion WPTE Team, the ASDEX Upgrade Team   +21 more
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Experiments and gyrokinetic simulations of TCV plasmas with negative triangularity in view of DTT operations

Plasma Physics and Controlled Fusion
Negative triangularity (NT) scenarios in TCV have been compared to positive triangularity (PT) scenarios using the same plasma shapes foreseen for divertor tokamak test tokamak operations. The experiments provided a NT/PT L-mode pair and a PT H-mode with
A. Balestri, P. Mantica, A. Mariani, F. Bagnato, T. Bolzonella, Justin Ball, S. Coda, M. Dunne, M. Faitsch, P. Innocente, P. Muscente, O. Sauter, M. Vallar, E. Viezzer, the TCV Team, the EUROfusion Tokamak Exploitation Team   +15 more
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Geometric dependencies of the mean E × B shearing rate in negative triangularity tokamaks

Nuclear Fusion, 2023
This paper presents a comparative study of the poloidal distribution of the mean E  ×  B shearing rate for positive triangularity (PT) and negative triangularity (NT) tokamaks.
Rameswar Singh, P.H. Diamond, A.O. Nelson   +2 more
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Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak

Nuclear Fusion
We present the first edge E _r measurements in negative triangularity (NT) plasmas in the Tokamak à Configuration Variable (TCV). The Doppler backscattering measurements of $v_\perp \approx E_r/B$ reveal a significant impact of triangularity on the E _r ...
S. Rienäcker, P. Hennequin, L. Vermare, C. Honoré, R. Bouffet-Klein, S. Coda, B. Labit, B. Vincent, K.E. Thome, O. Krutkin, A. Balestri, Y. Nakeva, the TCV Team   +12 more
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Infernal instabilities in negative-triangularity plasmas with negative central shear

Nuclear Fusion
A systematic numerical investigation is carried out to understand magnetohydrodynamic stability of the ideal infernal-kink instability in tokamak plasmas with both negative triangularity (neg-D) shaping and negative central shear for the equilibrium ...
X.M. Zhang, L. Li, Y.Q. Liu, Z.Y. Dong, J.W. Li, Y. Liang, F.C. Zhong   +6 more
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An analytical model of how the negative triangularity cuts off the access to the second stable region in tokamak plasmas

Nuclear Fusion
We present an analytical model to evaluate the triangularity-shaping effects in accessing the second stable region for the ideal ballooning mode. Our results indicate that if the triangularity is sufficiently negative, the path from the first to the ...
Y. Zhang, Z.B. Guo, R.R. Ma, M. Xu
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Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas [PDF]

Plasma Physics and Controlled Fusion
L-mode negative triangularity (NT) operation is a promising alternative to the positive triangularity (PT) H-mode as a high-confinement edge localised mode-free operational regime.
E. Tonello, F. Mombelli, O. Février, G. Alberti, T. Bolzonella, G. Durr-Legoupil-Nicoud, S. Gorno, H. Reimerdes, C. Theiler, N. Vianello, M. Passoni, the TCV Team, the W -X Team   +12 more
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On the formation of edge electric fields in negative triangularity plasmas

Plasma Physics and Controlled Fusion
The Negative Triangularity (NT) plasma edge is studied with full orbit simulations and compared with similar simulations using a Positive Triangularity (PT) edge geometry.
G. Krämer, A. Nelson, K. E. Thome, the DIII-D negative triangularity team   +3 more
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Robust Avoidance of Edge-Localized Modes alongside Gradient Formation in the Negative Triangularity Tokamak Edge. [PDF]

Physical Review Letters, 2023
In a series of high performance diverted discharges on DIII-D, we demonstrate that strong negative triangularity (NT) shaping robustly suppresses all edge-localized mode (ELM) activity over a wide range of plasma conditions: ⟨n⟩=0.1-1.5×10^{20}  m^{-3 ...
A. O. Nelson, L. Schmitz, C. Paz-Soldan, K. Thome, T. Cote, N. Leuthold, F. Scotti, M. Austin, A. Hyatt, T. Osborne   +9 more
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Negative Triangularity Tokamak as Fusion Energy System

Proceedings of 1st International e-Conference on Energies, 2014
Fusion energy development is quite successful in both getting equivalent energy breakevencondition in large tokamak and clarifying many important physics in the magnetically confinedplasma to proceed to a fusion experimental reactor, ITER. Now, fusion research has to solvethe power handling toward fusion demonstration power reactor (DEMO).
M. Kikuchi, A. Fasoli, T. Takizuka, P. H. Diamond, S. Yu. Medvedev, X.R. Duan, H. Zushi, M. Furukawa, Y. Kishimoto, Yunjing Wu, O. Sauter, L. Ṽillard, S. Brunner, G. Merlo, Guanjie Zheng, K. Mishra, M. Honda, H. Urano, M. J. Pueschel, D. Told, A. Fujisawa, K. Nagasaki, F. Sano   +22 more
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