Results 261 to 270 of about 63,312 (284)

Confinement and ELM characteristics of H-mode plasmas in KSTAR

Nuclear Fusion, 2012
Abstract The latest results of confinement and edge-localized mode (ELM) characteristics of Korea Superconducting Tokamak Advanced Research (KSTAR) H-mode plasmas are reported. The estimation of fast ion contribution to the total stored energy, calculated by both the NUBEAM and ASTRA simulations, and of the effective total heating power ...
J-W. Ahn, H.-S. Kim, Y.S. Park, L. Terzolo, W.H. Ko, J.-K. Park, A.C. England, S.W. Yoon, Y.M. Jeon, S.A. Sabbagh, Y.S. Bae, J.G. Bak, S.H. Hahn, D.L. Hillis, J. Kim, W.C. Kim, J.G. Kwak, K.D. Lee, Y.S. Na, Y.U. Nam, Y.K. Oh, S.I. Park   +21 more
openaire   +1 more source

Transition dynamics and confinement scaling in COMPASS-D H mode plasmas

Nuclear Fusion, 2001
An experimental analysis is discussed of different phases of ECRH H?mode discharges on COMPASS-D, from L-H transition triggering to steady state. Comprehensive high resolution measurements in the transport barrier region have enabled significant progress to be made in assessing H?mode transition models, together with additional experiments aimed at ...
S.J Fielding, P.G Carolan, J.W Connor, N.J Conway, A.R Field, P Helander, Yu Igitkhanov, B Lloyd, H Meyer, A.W Morris, O Pogutse, M Valovi, H.R Wilson, COMPASS-D Team, ECRH Team   +14 more
openaire   +1 more source

Plasma confinement in JET H mode plasmas with H, D, DT and T isotopes

Nuclear Fusion, 1999
The scaling of the energy confinement in H mode plasmas with different hydrogenic isotopes (hydrogen, deuterium, DT and tritium) is investigated in JET. For ELM-free H modes the thermal energy confinement time τth is found to decrease weakly with the isotope mass (τth ~M-0.25±0.22), whilst in ELMy H modes the energy confinement time shows practically ...
J.G Cordey, B Balet, D.V Bartlett, R.V Budny, J.P Christiansen, G.D Conway, L.-G Eriksson, G.M Fishpool, C.W Gowers, J.C.M. de Haas, P.J Harbour, L.D Horton, A.C Howman, J Jacquinot, W Kerner, C.G Lowry, R.D Monk, P Nielsen, E Righi, F.G Rimini, G Saibene, R Sartori, B Schunke, A.C.C Sips, R.J Smith, M.F Stamp, D.F.H Start, K Thomsen, B.J.D Tubbing, M.G. von Hellermann   +29 more
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Characteristics of global energy confinement in KSTAR L- and H-mode plasmas

Nuclear Fusion, 2014
We evaluate the characteristics of global energy confinement in KSTAR (?E,KSTAR) quantitatively in three ways; firstly by comparing it with multi-machine scalings, secondly by deriving multiple regression equations for the L- and the H-mode plasmas, respectively, and lastly by comparing confinement enhancement of the H-mode phase with respect to the L ...
Kim, HS Kim, HS, Jeon, YM Jeon, YM, Na, YS Na, YS, Ghim, YC Ghim, Young-chul, Ahn, JW Ahn, JW, Yoon, SW Yoon, SW, Bak, JG Bak, JG, Bae, YS Bae, YS, Kim, JS Kim, JS, Joung, M Joung, M, Jeong, JH Jeong, JH, Hong, SH Hong, SH, Kim, KM Kim, KM, Suzuki, T Suzuki, T, Kim, WC Kim, WC, Kwak, JG Kwak, JG   +15 more
openaire   +2 more sources

Thermal energy confinement properties of ELMy H mode plasmas in JT-60U

Nuclear Fusion, 2002
The dominant causes of the reduction in the enhancement factor of thermal energy confinement with increasing plasma density in ELMy H mode plasmas in JT-60U were analysed by separating the thermal stored energy into core and pedestal components.
H Urano, Y Kamada, H Shirai, T Takizuka, S Ide, T Fujita, T Fukuda   +6 more
openaire   +1 more source

Energy confinement of hydrogen and deuterium H-mode plasmas in JT-60U

Nuclear Fusion, 2012
Abstract Energy confinement properties for hydrogen and deuterium H-mode plasmas are investigated. The thermal energy confinement time becomes longer in deuterium by a factor of ∼1.4 than in hydrogen at a given absorbed power. When the absorbed power is fixed, the values of electron temperature T e and ion temperature T
H. Urano, T. Takizuka, T. Fujita, Y. Kamada, T. Nakano, N. Oyama   +5 more
openaire   +1 more source

Thermal energy confinement of high-triangularity ELMy H-mode plasmas in JT-60U

Plasma Physics and Controlled Fusion, 2001
High-triangularity ELMy H-mode experiments (δx~0.45) have been carried out in JT-60U. In the low-density regime (e/nGW 0.5), at fixed neutral beam heating power type-III ELMs are generated and the pedestal pressure reduces gradually with density whereas the ELM frequency at low triangularity is much lower at a given density.
H Urano, Y Kamada, H Shirai, T Takizuka, H Kubo, T Hatae, T Fukuda   +6 more
openaire   +1 more source

Decoupling the effects of plasma current and plasma density on DIII-D H mode energy confinement

Nuclear Fusion, 1994
Experiments that decoupled H mode plasma current and plasma density have been performed for the first time on the DIII-D tokamak by the application of divertor cryopumping. Deuterium ELMing H mode discharges were operated in the single null configuration with 6 MW of neutral beam injection. These steady state discharges were operated at 1.5 and 0.75 MA
D.P Schissel, M.A Mahdavi, J.C DeBoo, M Le   +3 more
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Time evolution of transport properties in JT-60U H-mode plasmas with improved core confinement

Plasma Physics and Controlled Fusion, 1996
The time evolution of confinement and transport properties of ICC H-mode plasmas in JT-60U has been studied. We found the change of confinement character on a timescale much smaller than the thermal energy confinement time, , at the L - H and H - L transitions. A slow change on a timescale of is also found during the H-mode phase.
H Shirai, T Takizuka, Y Koide, Y Kamada, S Ishida, M Mori, O Naito, M Sato, N Isei, T Fukuda, Y Kawano, T Hirayama, M Azumi   +12 more
openaire   +1 more source

Impurity screening in Ohmic and high confinement (H-mode) plasmas in the Alcator C-Mod tokamak

Physics of Plasmas, 1997
A series of experiments has been carried out to determine the relative screening of the low recycling gaseous impurities, nitrogen and methane, in Alcator C-Mod tokamak [Phys. Plasmas 1, 1511 (1994)] discharges. The impurity density in the core plasma is directly proportional to the rate of impurity injection.
G. M. McCracken, B. Lipschultz, B. LaBombard, J. A. Goetz, R. S. Granetz, D. Jablonski, S. Lisgo, H. Ohkawa, P. C. Stangeby, J. L. Terry, and the Alcator Group   +9 more
openaire   +1 more source