Conveners
ELMs Suppression & Dynamics: EX/10 & TH/8
- Hyeon K. Park (UNIST)
Dr
Alessandro Bortolon
(PPPL)
10/21/16, 4:40 PM
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Oral
DIII-D studies of high-frequency ELM pacing by pellet injection were extended to ITER scenarios at low beam torque, demonstrating ELM peak heat flux mitigation with D2 pellets, and also with Li spheres, proving the concept of ELM pacing with non fuel pellets, a technique that could potentially reduce the throughput to the pumping and fuel reprocessing systems in ITER.
Injection of D2...
Dr
Guosheng Xu
(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China)
10/21/16, 5:00 PM
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Oral
A new control technique for the edge-localized modes (ELMs) by pace-making with low-hybrid current drive (LHCD) power modulation has been demonstrated, for the first time, in the EAST superconducting tokamak. The achievable pace-making frequency is up to 120Hz, which appears to be limited only by the pedestal recovery time. LHCD leads to the density pump-out and local flattening of the density...
Prof.
Gunsu YUN
(Pohang University of Science and Technology)
10/21/16, 5:20 PM
EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)
Oral
Edge-localized modes (ELMs) in the KSTAR tokamak appear substantially different from the conventional picture of ELMs as an explosive transport event in the plasma edge triggered by exponentially growing ballooning and external kink modes on the low field side of the plasma. The 2-D images of ELMs visualized by an advanced imaging diagnostics^1 with microsecond time resolution revealed that...
Dr
NOBUYUKI AIBA
(Japan Atomic Energy Agency)
10/21/16, 5:40 PM
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
Diamagnetic MHD equations for plasmas with fast flow were derived for the first time by introducing a suitable ordering parameter to two fluid equations. The extended Frieman-Rotenberg (F-R) equation was obtained from the diamagnetic MHD equations by focusing on impacts of the ion diamagnetic drift effect on ideal MHD stability in rotating plasmas. The MINERVA-DI code was developed to solve...
Dr
Stanislas Pamela
(CCFE - UKAEA)
10/21/16, 6:00 PM
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
Future devices like JT-60SA, ITER and DEMO require quantitative predictions of pedestal density and temperature levels, as well as divertor heat fluxes, in order to improve global confinement capabilities while preventing divertor erosion/melting in the planning of future experiments. Such predictions can be obtained from dedicated pedestal models like EPED, and from non-linear MHD codes like...
Dr
Hogun Jhang
(National Fusion Research Institute)
10/21/16, 6:20 PM
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
We study the role of zonal flows in edge pedestal collapse using a reduced magnetohydrodynamic (MHD) model. A dramatic
change of dynamics happens when ideal ballooning modes are stabilized. A detailed analysis shows that a zonal flow driven instability is developed due to a strong excitation of zonal
vorticity, resulting in secondary crashes.
The presence of subsidiary bursts
after a main...
