Conveners
Transport & LH Transition: EX/5 & TH/3 & PPC/2
- Sibylle Guenter (Max-Planck-Institut für Plasmaphysik)
Dr
Alberto Loarte
(ITER Organization)
10/20/16, 8:30 AM
PPC - Plasma Overall Performance and Control
Oral
In order to evaluate if W accumulation is expected in ITER plasma conditions and whether the available heating systems can provide the degree of control required for stable H-mode operation we have applied integrated plasma models (ASTRA and JINTRAC) to a wide range of plasma conditions in ITER including confinement transients (i.e. L-H and H-L transitions). The studies find that, in agreement...
Mr
Xavier Garbet
(CEA)
10/20/16, 8:50 AM
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
This paper investigates the interplay of neoclassical, turbulent and MHD processes, which are simultaneously at play when contributing to impurity transport. It is shown that these contributions are not additive, as assumed sometimes. The interaction between turbulence and neoclassical effects leads to less effective thermal screening, i.e. lowers the outward flux due to temperature gradient....
Zheng Yan
(University of Wisconsin- Madison)
10/20/16, 9:10 AM
EXC - Magnetic Confinement Experiments: Confinement
Oral
Measurements of long wavelength (K_perp Rho_I<1) density fluctuation characteristics in the edge of both Deuterium (D) and Hydrogen (H) plasmas across the L-H transition on DIII-D demonstrate the existence of single or double bands of low-wavenumber turbulence observed near the edge of H and D plasmas, which are strongly correlated with the L to H-mode transition power threshold (P_LH) and can...
Dr
Jon Hillesheim
(CCFE)
10/20/16, 9:30 AM
EXC - Magnetic Confinement Experiments: Confinement
Oral
Unraveling the conditions that permit access to H-mode continues to be an unresolved physics issue for tokamaks. The scaling of the L-H transition power threshold, P_LH, to future devices has considerable uncertainty. Experiments have been performed in JET, with the ITER-like W/Be wall, to investigate the dependencies of P_LH and also to probe the underlying physics of the transition...
Dr
Ahmed Diallo
(PPPL)
10/20/16, 9:50 AM
EXC - Magnetic Confinement Experiments: Confinement
Oral
The physical mechanism governing the L-H transition has been a long standing theoretical and experimental challenge. Understanding its trigger mechanism is critical for the operation of future fusion devices and ITER. This work is motivated by the need to test L-H transition models (e.g., predator-prey, and ExB flow suppression) and explore possible new L-H transition dynamics. This paper...
