Dr
Elena de la Luna
(CIEMAT)
24/10/2018, 10:45
EXS - Magnetic Confinement Experiments: Stability
Oral
An important aspect of ITER operation will be the termination of the high confinement H-mode phase ($I_p$ ramp-down phase) in a controlled and safe way. Previous ramp-down studies in JET and other devices focused on aspects related to flux consumption and vertical stability control. In this work the emphasis is on aspects related to W accumulation and its control, which can be particularly...
Dr
Darin Ernst
(MIT)
24/10/2018, 11:05
EXS - Magnetic Confinement Experiments: Stability
Oral
Wide Pedestal QH-mode is a new steady ELM-free regime obtained in DIII-D, exhibiting a transport-limited pedestal regulated by broadband turbulence, with improved confinement relative to QH-Mode under the same conditions, attaining $\beta_N\sim 2.3$ and H98y2$\sim$1.6, which increase with power. Toward compatibility with burning plasma conditions, the need for neutral beam torque to initiate...
Dr
Tim Happel
(Max-Planck-Institut für Plasmaphysik)
24/10/2018, 11:25
EXS - Magnetic Confinement Experiments: Stability
Oral
The I-mode is an improved confinement regime of tokamak plasmas where an edge transport barrier is observed only in the heat transport but not in the particle transport. This is in contrast to H-mode confinement, which is characterized by transport barriers for both heat and particles. The I-mode does not exhibit any edge localizes modes. Since the particle confinement is low, the I-mode does...
Dr
Philip Snyder
(General Atomics)
24/10/2018, 11:45
EXS - Magnetic Confinement Experiments: Stability
Oral
The “Super H-mode” regime is predicted to enable pedestal height and fusion performance substantially higher than for standard H-mode operation. This regime exists due to a bifurcation of the pedestal pressure, as a function of density, that occurs in strongly shaped plasmas above a critical density. Experiments on Alcator C-Mod and DIII-D have achieved access to the Super H-Mode regime, and...
Dr
BENOIT LABIT
(Swiss Plasma Center (SPC) EPFL SWITZERLAND)
24/10/2018, 12:05
EXS - Magnetic Confinement Experiments: Stability
Oral
A series of experiments has been conducted at AUG and TCV to disentangle the role of fueling, plasma triangularity and closeness to a double null (DN) configuration for the onset of the small ELM regime. At AUG, the role of the SOL density has been revisited. Indeed, it turns out that a large density SOL is not a sufficient condition to achieve the type-II (small) ELM regime. This has been...
