27th IAEA Fusion Energy Conference - IAEA CN-258

Session

EX/3 Plasma Performance & Control

EX/3

24 Oct 2018, 14:00

Mahatma Mandir Conference Centre

368. Integrated operation of steady-state long pulse H-mode in EAST

Prof. Xianzu Gong (Insititute of Plasma Physics, Chinese Academy Sciences)

24/10/2018, 14:00

EXC - Magnetic Confinement Experiments: Confinement

Oral

Recent EAST experiment has successfully demonstrated long-pulse steady-state scenario with a good plasma performance through the integrated operation since the last IAEA in 2016. A discharge with a duration over 100s has been obtained with multi-RF power heating and current drive. Plasma parameters are as follows, plasma current Ip=0.4 MA, poloidal βP ~1.2, toroidal magnetic field BT=2.5 T,...

242. Developing steady state ELM-absent H-mode scenarios with advanced divertor configuration in EAST tokamak

Dr Nicola Vianello

24/10/2018, 14:20

EXC - Magnetic Confinement Experiments: Confinement

Oral

The divertor properties of a two nearby magnetic poloidal nulls (2-NDN) configuration have been recently investigated in steady state (Vloop<0) H-mode plasmas, (H98=1), Edge Localized Modes (ELM) absent, on EAST tokamak. Due to the location of Poloidal Field (PF) coils and target plates in EAST, the secondary null could be moved around from the primary one to form a magnetic configuration that...

26. Integration of the high- N hybrid scenario to a high performance pedestal, stable zero torque operation and a divertor solution

Dr Francesca Turco (Columbia University)

24/10/2018, 14:40

EXC - Magnetic Confinement Experiments: Confinement

Oral

DIII-D experiments have demonstrated the expansion of the high-betaN hybrid scenario to the high density levels necessary for radiating divertor operation, leading to pedestal enhancement, and showed how the choice of injected impurity impacts the effectiveness of a radiating mantle solution, as well as the impurity transport to the core and the divertor. The scenario was made robust to...

347. Optimisation of JET-DT and ITER operation by developing an understanding of the role of low-Z impurity on the H-mode pedestal

Dr Carine Giroud (CCFE)

24/10/2018, 15:00

EXC - Magnetic Confinement Experiments: Confinement

Oral

Impurity seeding via injection of neon (Ne) or nitrogen (N) will be mandatory in ITER Q=10 reference scenario to reduce inter-ELM power load to the divertor within the engineering limits. The challenge is achieving the scenario requirement of $ H_{98(y,2)}$=1, $\beta_N $=1.8, $\frac{(n)}{n_{GW}}$=0.85, $\delta $=0.4, with a high radiative divertor. These conditions necessitate a high pedestal...

492. Increasing the Density in W7-X: Benefits and Limitations

Dr Golo Fuchert (Max-Planck-Institut für Plasmaphysik, Greifswald, Germany)

24/10/2018, 15:20

EXC - Magnetic Confinement Experiments: Confinement

Oral

As the first comprehensively optimized stellarator, Wendelstein 7-X (W7-X) is an essential experiment to study high density operation in this kind of device. This contribution presents first experiments on the density dependence of the energy confinement in W7-X and limitations of the achievable density. Theoretical predictions and empirical scaling laws for the energy confinement time in...

684. Scenario development for DT operation at JET

Dr Luca Garzotti (United Kingdom Atomic Energy Agency - Culham Centre for Fusion Energy)

24/10/2018, 15:40

EXC - Magnetic Confinement Experiments: Confinement

Oral

The JET exploitation plan foresees D-T operations in 2019-20. With respect to the first D-T campaign in 1998, when JET was equipped with a C wall, the experiments will be conducted in presence of a Be-W ITER-like wall and will benefit from an extended and improved set of diagnostics and higher available additional power. Among the challenges presented by operations with the new wall there are...