Results 211 to 220 of about 1,276,201 (259)

New subjects of the H-mode

Plasma Physics and Controlled Fusion, 1994
Next-step devices and advanced tokamaks and stellarators are discussed. Improved wall conditioning allows the power threshold to decrease and H-mode operation under ohmic conditions occurs. Density-, helium exhaust-, and ELM control has been demonstrated for H-mode plasmas albeit in a rather rudimentary form.
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The ELMy H mode as a limit cycle and the transient responses of H modes in tokamaks

Nuclear Fusion, 1993
A model of edge localized modes (ELMs) in tokamaks is presented. The model of the L-H transition, which is based on electric field bifurcation, is extended to include the temporal evolution and the spatial structure. The existence of an electric field bifurcation implies that there is a hysteresis curve between the plasma gradient (thermodynamic force)
S.-I Itoh, K Itoh, A Fukuyama
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Towards Modeling of ITER H‐mode

Contributions to Plasma Physics, 2010
AbstractReported is the first modeling of ITER H‐mode. Simulations were made with the code B2SOLPS5.2 with drifts and currents, which was specially developed for simulation of tokamak H‐regimes. The emphasis is made on the pedestal and edge transport barrier regions.
Rozhansky, V., Veselova, I., Kaveeva, E., Voskoboynikov, S., Coster, D.   +4 more
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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
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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 the ASDEX tokamak

Plasma Physics and Controlled Fusion, 1994
The L-H transition in the ASDEX tokamak was investigated. The level of fluctuations both in the scrape-off layer and in a narrow region inside the separatrix drops on a 100 mu s timescale. Density turbulence coming from the edge and magnetic turbulence, as measured with magnetic probes, show a similar behavior.
E Holzhauer, G Dodel, M Endler, J Gernhardt, L Giannone, M Manso, K McCormick, V Mertens, H Niedermeyer, A Rudyj, F Serra, A Silva, G Theimer, P Varela, F Wagner, H Zohm   +15 more
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H-Mode 2D

2015
Vor dem Hintergrund wachsender technischer Moglichkeiten im Bereich der Assistenz und Automation entstehen vielfaltige Herausforderungen, Risiken und Chancen in der Gestaltung des assistierten, teil- und hochautomatisierten Fahrens. Eine der grosten Herausforderungen besteht darin, eine Vielzahl von komplexen technischen Funktionen so zu integrieren ...
Eugen Altendorf, Marcel Baltzer, Martin Kienle, Sonja Meier, Thomas Weißgerber, Matthias Heesen, Frank Flemisch   +6 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
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H-Mode Study in CHS

Fusion Technology, 1995
In CHS rapid H-mode transition is observed in NBI heated deuterium and hydrogen plasmas without obvious isotope effect, when a net plasma current is ramped up to increase the external rotational transform. The H-mode of CHS has many similarities with those in tokamaks.
K. Toi, T. Morisaki, S. Sakakibara, S. Ohdachi, T. Minami, S. Morita, H. Yamada, K. Tanaka, K. Ida, S. Okamura, A. Ejiri, H. Iguchi, K. Nishimura, K. Matsuoka, A. Ando, J. Xu, I. Yamada, K. Narihara, R. Akiyama, H. Idei, S. Kubo, T. Ozaki, C. Takahashi, K. Tsumori   +23 more
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PHYSICS OF AND ACHIEVEMENTS WITH THE H-MODE

AIP Conference Proceedings, 2008
The H‐mode is a confinement mode of toroidal plasmas which may make the goals of fusion possible—the development of a clean energy source at competitive electricity costs. The most challenging aspect in the understanding of the H‐mode physics is the sudden disappearance of the edge turbulence whereas its potential driving forces increase.
F. Wagner, Sadruddin Benkadda
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