Multi-device studies of pedestal physics and confinement in the I-mode regime
| Autor: | Jerry Hughes, A. Loarte, T.H. Osborne, L. W. Schmitz, George McKee, Alessandro Marinoni, D.G. Whyte, E. Wolfrum, E. Viezzer, Istvan Cziegler, R. M. McDermott, S.P. Gerhardt, Zheng Yan, M.E. Fenstermacher, L. Barrera Orte, Amanda Hubbard, F. Ryter, J. E. Rice, R. Maingi, P. Gohil, T. L. Rhodes, R. Fischer, Randy Michael Churchill, J.R. Walk, S.M. Wolfe, Max E Austin, P. Manz, T. Happel, Anne White, Earl Marmar, R. J. Groebner, Christian Theiler |
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| Přispěvatelé: | Massachusetts Institute of Technology. Plasma Science and Fusion Center, Whyte, Dennis, Hubbard, Amanda E, Hughes Jr, Jerry, Marinoni, Alessandro, Marmar, Earl S, Rice, John E, Walk Jr, John R, Whyte, Dennis G, Wolfe, Stephen M, Alcator C-Mod Team, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, DIII-D Team |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Physics
Nuclear and High Energy Physics Tokamak Cyclotron Collisionality Condensed Matter Physics 01 natural sciences Neutral beam injection Electron cyclotron resonance 010305 fluids & plasmas law.invention Pedestal ASDEX Upgrade law Physics::Plasma Physics 0103 physical sciences Atomic physics 010306 general physics Dimensionless quantity |
| Zdroj: | Prof. Whyte via Chris Sherratt Nuclear Fusion |
| ISSN: | 1741-4326 0029-5515 0741-3335 1742-6596 |
| Popis: | This paper describes joint ITPA studies of the I-mode regime, which features an edge thermal barrier together with L-mode-like particle and impurity transport and no edge localized modes (ELMs). The regime has been demonstrated on the Alcator C-Mod, ASDEX Upgrade and DIII-D tokamaks, over a wide range of device parameters and pedestal conditions. Dimensionless parameters at the pedestal show overlap across devices and extend to low collisionality. When they are matched, pedestal temperature profiles are also similar. Pedestals are stable to peeling–ballooning modes, consistent with lack of ELMs. Access to I-mode is independent of heating method (neutral beam injection, ion cyclotron and/or electron cyclotron resonance heating). Normalized energy confinement H 98,y2 ≥ 1 has been achieved for a range of 3 ≤ q 95 ≤ 4.9 and scales favourably with power. Changes in turbulence in the pedestal region accompany the transition from L-mode to I-mode. The L–I threshold increases with plasma density and current, and with device size, but has a weak dependence on toroidal magnetic field B T. The upper limit of power for I-modes, which is set by I–H transitions, increases with B T and the power range is largest on Alcator C-Mod at B > 5 T. Issues for extrapolation to ITER and other future fusion devices are discussed. United States. Department of Energy (DE-FC02-99ER54512-CMOD) United States. Department of Energy (DE-SC0012469) United States. Department of Energy (DE-FC02-04ER54698) United States. Department of Energy (DE-FG02-94ER54235) United States. Department of Energy (DE-AC52-07NA27344) United States. Department of Energy (DE-AC02-09CH11466) United States. Department of Energy (DE-FG02-89ER53296) United States. Department of Energy (DE-FG02-08ER54999) United States. Department of Energy (DE-FG02-08ER54984) |
| Databáze: | OpenAIRE |
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