Results 1 to 10 of about 1,315 (185)

Analysis and expansion of the quasi-continuous exhaust (QCE) regime in ASDEX Upgrade

Nuclear Fusion, 2023
The quasi-continuous exhaust (QCE) regime, formerly known as either type-II ELM or small ELM regime is studied in ASDEX Upgrade. The regime is a natural type-I ELM-free H-mode.
M. Faitsch, T. Eich, G.F. Harrer, E. Wolfrum, D. Brida, P. David, M. Dunne, L. Gil, B. Labit, U. Stroth, the ASDEX Upgrade Team, the EUROfusion MST1 Team   +11 more
doaj   +4 more sources

The quasi-continuous exhaust regime in JET

Nuclear Fusion
The quasi-continuous exhaust (QCE) regime is a regime that is naturally type-I ELM-free. It combines the high density at the plasma edge needed for power exhaust with the high normalised energy confinement typical for H-mode operation.
M. Faitsch, M. Dunne, E. Lerche, P. Lomas, I. Balboa, P. Bilkova, P. Bohm, A. Kappatou, D. Kos, B. Labit, S. Menmuir, O. Sauter, S. Silburn, E.R. Solano, H.J. Sun, A. Tookey, E. Viezzer, U. Stroth, JET Contributors, the EUROfusion Tokamak Exploitation Team   +19 more
doaj   +7 more sources

The quasi-continuous exhaust regime in ASDEX Upgrade and JET

Nuclear Materials and Energy
The quasi-continuous exhaust (QCE) regime is a type-I ELM-free high confinement regime obtained at high plasma shaping and high separatrix density. A comparison with various ELM-free regimes in the literature is presented together with potential physics ...
M. Faitsch, M. Dunne, E. Lerche, P. Lomas, I. Balboa, P. Bilkova, P. Bohm, L. Gil, G.F. Harrer, A. Kappatou, D. Kos, B. Labit, L. Radovanovic, A. Redl, O. Sauter, S. Silburn, E.R. Solano, A. Tookey, E. Viezzer, E. Wolfrum, U. Stroth   +20 more
doaj   +9 more sources

Quasi-continuous exhaust operational space

Nuclear Fusion
The IPED predictive pedestal code has been used to determine the critical gradients for the onset of 1) separatrix ballooning modes and 2) global peeling-ballooning modes as a function of plasma shaping.
M. Dunne, M. Faitsch, L. Radovanovic, E. Wolfrum, the ASDEX Upgrade Team   +4 more
doaj   +4 more sources

Local plasma shape modification to facilitate access to quasi continuous exhaust (QCE) regime

Nuclear Fusion
The effects of a poloidally localized bulge at outer midplane are investigated with regards to the stability of ideal MHD peeling-ballooning modes (PBMs) and $n = \infty$ ballooning modes.
S. Saarelma, S. Bakes, L. Frassinetti, STEP Team   +3 more
doaj   +3 more sources

Assessing wall heat fluxes in the quasi-continuous exhaust regime at ASDEX Upgrade

Nuclear Fusion
The 3D fluid edge code EMC3-EIRENE has been used to simulate three ASDEX Upgrade discharges with the same equilibrium but different upstream collisionality $\nu^*$ .
L. Scotti, D. Brida, M. Cavedon, A. Redl, M. Faitsch, G. Grenfell, T. Lunt, P. David, R. Fischer, the Eurofusion Tokamak Exploitation Team, the ASDEX Upgrade Team   +10 more
doaj   +4 more sources

Developing a physics understanding of the quasi-continuous exhaust regime: pedestal profile and ballooning stability analysis

Nuclear Fusion, 2022
Abstract It has been experimentally observed that at ASDEX Upgrade (AUG) plasmas at relatively high shaping, an increase of gas fuelling corresponds to an increase of the frequency and intensity of the type-I edge localised modes (ELMs). At high enough fuelling, the plasma enters the quasi continuous exhaust (QCE) regime.
Mike Dunne, Elisabeth Wolfrum, Friedrich Aumayr   +2 more
exaly   +3 more sources

Quasicontinuous Exhaust Scenario for a Fusion Reactor: The Renaissance of Small Edge Localized Modes

Physical Review Letters, 2022
Tokamak operational regimes with small edge localized modes (ELMs) could be a solution to the problem of large transient heat loads in future fusion reactors because they provide quasi-continuous exhaust while keeping a good plasma confinement. A ballooning mode mechanism near the last closed flux surface (LCFS) governed by an interplay of the pressure
G F, Harrer, M, Faitsch, L, Radovanovic, E, Wolfrum, C, Albert, A, Cathey, M, Cavedon, M, Dunne, T, Eich, R, Fischer, M, Griener, M, Hoelzl, B, Labit, H, Meyer, F, Aumayr, , The Asdex Upgrade Team, , The EUROfusion Mst Team   +16 more
openaire   +4 more sources

Experimental characterization of the quasi-coherent mode in EDA H-Mode and QCE scenarios at ASDEX Upgrade

Nuclear Fusion, 2023
The quasi-coherent mode (QCM), appearing in enhanced D $_{\alpha}$ high confinement mode (EDA H-mode) and quasi-continuous exhaust (QCE) plasmas has been analysed in detail at ASDEX Upgrade via thermal helium beam spectroscopy under various discharge ...
J. Kalis, G. Birkenmeier, P. Manz, T. Eich, M. Griener, R. Goti, M. Cavedon, L. Gil, M. Faitsch, L. Radovanovic, D. Wendler, E. Wolfrum, U. Stroth, the ASDEX Upgrade Team, the EUROfusion MST1 Team   +14 more
doaj   +1 more source

Broadening of the power fall-off length in a high density, high confinement H-mode regime in ASDEX Upgrade

Nuclear Materials and Energy, 2021
The search for scenarios in which tolerable power exhaust is combined with good confinement must involve high separatrix densities. We present here the first infrared thermography measurements at ASDEX Upgrade in a high density, high confinement H-mode ...
M. Faitsch, T. Eich, G.F. Harrer, E. Wolfrum, D. Brida, P. David, M. Griener, U. Stroth   +7 more
doaj   +1 more source