Results 281 to 290 of about 19,217,453 (333)

H-mode research in NSTX

Nuclear Fusion, 2003
H-modes are routinely obtained in the National Spherical Torus Experiment (NSTX) and have become a standard operational scenario. L–H transitions triggered by NBI heating have been obtained over a wide parameter range in Ip, Bt, and e in either lower-single-null (LSN) or double-null (DN) diverted discharges.
R Maingi, M.G Bell, R.E Bell, C.E Bush, E.D Fredrickson, D.A Gates, T Gray, D.W Johnson, R Kaita, S.M Kaye, S Kubota, H.W Kugel, C.J Lasnier, B.P LeBlanc, R.J Maqueda, D Mastrovito, J.E Menard, D Mueller, M Ono, F Paoletti, S.J Paul, Y.-K.M Peng, A.L Roquemore, S.A Sabbagh, C.H Skinner, V.A Soukhanovskii, D Stutman, D.W Swain, E.J Synakowski, T Tan, J.B Wilgen, S.J Zweben   +31 more
openaire   +1 more source

Numerical simulation of ELM-free H-mode and hot-ion H-mode JET plasmas

Plasma Physics and Controlled Fusion, 1996
An empirical model for anomalous transport which contains both Bohm and gyroBohm terms is proposed and tested on the set of JET discharges which include L-, H- and hot-ion mode.
A Cherubini, M Erba, V Parail, E Springmann, A Taroni   +4 more
openaire   +1 more source

Survey of H-mode transition and confinement from ASDEX Upgrade 'H-mode standard shot'

Plasma Physics and Controlled Fusion, 2002
The H-mode standard shot of ASDEX Upgrade provides an overview of the long term evolution of machine conditions and scatter of H-mode power threshold and confinement. This type-I ELMy H-mode is run every day of plasma operation since 1999. After a long opening for in-vessel work, the power threshold drops rapidly by about 50% over 100 discharges and ...
Ryter, F., Fahrbach, H., Gude, A., Neu, R., Rohde, V., Stober, J.   +5 more
openaire   +3 more sources

Latest results on the H-mode threshold using the international H-mode threshold database

Plasma Physics and Controlled Fusion, 2000
This is an analysis of the H-mode threshold physics by the International H-mode Threshold Database Working Group. The data from 10 different tokamaks world-wide are combined in an attempt to determine the physics of the H-mode transition as well as the scaling of the plasma parameters relevant to the H-mode transition to future magnetic fusion devices.
J A Snipes, the International H-mode Threshold Group   +1 more
openaire   +1 more source

Active control of H-mode

Plasma Physics and Controlled Fusion, 1996
The present status of investigations concerning active control of the H-mode is discussed, including density control for steady H-mode operation, control of heat flux to lower the divertor heat load, and control of the transport barrier for further improvement of confinement and MHD stability.
openaire   +1 more source

H-mode confinement in tokamaks

Plasma Physics and Controlled Fusion, 1987
The paper reviews present understanding of H-mode physics by summarising relevant experimental observations and discussing possible interpretation. The most important features of the H-mode are a minimum threshold edge temperature (threshold input power) required to achieve the H-mode; the bifurcation nature of the H-transition with instantaneous ...
openaire   +1 more source

H-modes on Alcator C-Mod

Plasma Physics and Controlled Fusion, 1996
H-modes exhibiting improved confinement above the L-mode are achieved in Alcator C-Mod with ICRF and with ohmic heating alone without boronization. Both ELM-free and ELMy H-modes are obtained with total input power from 0.75 to 4.2 MW over a range of densities (0.8 to ) and toroidal fields (3 to 8 T).
J A Snipes, A E Hubbard, D T Garnier, S N Golovato, R S Granetz, M Greenwald, I H Hutchinson, J Irby, B LaBombard, E S Marmar, A Niemczewski, P J O'Shea, M Porkolab, P Stek, Y Takase, J L Terry, R Watterson, S M Wolfe   +17 more
openaire   +1 more source

H-mode pedestal characteristics on MAST

Plasma Physics and Controlled Fusion, 2004
The H-mode pedestal characteristics on the mega ampere spherical tokamak (MAST) are measured in a variety of disconnected double null discharges and the effect of edge localized modes (ELMs) on the pedestal is presented. The edge density pedestal width in spatial co-ordinates is similar on both the inboard and outboard sides. Neutral penetration may be
A Kirk, G F Counsell, E Arends, H Meyer, D Taylor, M Valovic, M Walsh, H Wilson, the MAST team   +8 more
openaire   +1 more source

H-mode of W7-AS stellarator

Plasma Physics and Controlled Fusion, 1994
In W7-AS the H-mode has been observed for the first time in a currentless stellarator plasma. H-modes are achieved with 0.4 MW Electron Cyclotron Resonance Heating with 140 GHz at 2.5 T and high density, with 70 GHz at 1.25 T and lower density and with neutral beam injection. The H-phases display all characteristics known from tokamak H-modes including
Wagner, F., Baldzuhn, J. ; https://orcid.org/0000-0001-5667-351X, Brakel, R., Burhenn, R., Erckmann, V., Estrada, T., Grigull, P., Hartfuss, H., Herre, G., Hirsch, M., Hofmann, J., Jaenicke, R., Rudyj, A., Stroth, U., Weller, A.   +14 more
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The H-mode in COMPASS-D

Plasma Physics and Controlled Fusion, 1996
H-mode confinement is observed in COMPASS-D in ohmic and ECR heated single null divertor configuration discharges over a wide parameter range. At low densities the L - H transition power threshold shows a sharp increase, in contrast to scaling law behaviour.
S J Fielding, J D Ashall, P G Carolan, A Colton, D Gates, J Hugill, A W Morris, M Valovic, the COMPASS-D, ECRH teams   +9 more
openaire   +1 more source