4th Technical Meeting on Divertor Concepts

Session

Radiative Divertor

10 Nov 2022, 09:00

Board Room A (IAEA Headquarters)

Conveners

Radiative Divertor

• Matthew Reinke (Commonwealth Fusion Systems)

Radiative Divertor

• Matthew Reinke (Commonwealth Fusion Systems)

127. Entry to and exit from ELM suppressed H-mode in detached conditions

Dr Matthias Bernert (Max-Planck-Institut für Plasmaphysik)

10/11/2022, 09:00

Radiative Power Exhaust

Oral

While detachment is in present-day machines routinely achieved under different conditions during the flattop of a discharge by either density ramps or extrinsic impurity seeding, it has not yet been shown to be accessed and controlled throughout the full duration of a discharge. For future machines, it is essential to be in detachment already during the power ramp up, the L-H transition and...

109. Particle and power exhaust of new EAST lower tungsten divertor for advanced steady-state operations

Dr Liang Wang (Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP))

10/11/2022, 09:30

Radiative Power Exhaust

Oral

Significant progress has been made on the new lower tungsten (W) divertor with closed geometry and active water-cooling capability for steady state operations in EAST since 2021. The latest experimental results demonstrate that the new divertor exhibits strong particle exhaust capability and relatively high neutral retention in the divertor region, which facilitate both impurity screening and...

144. Radiative divertor compatible with RMP-driven, ELM-crash-suppression in fusion DEMO-type devices

Prof. Yongkyoon In (Ulsan National Institute of Science and Technology)

10/11/2022, 09:50

Radiative Power Exhaust

Oral

The edge-localized-modes (ELMs) in magnetic fusion reactor raise a major concern not only due to the degraded core confinement, but also due to the adverse effects against plasma facing components [1]. In the existing medium size tokamaks, the application of resonant magnetic perturbation (RMP) has proven effective in suppressing ELMs without being limited to ELM-crash-mitigation. Nonetheless,...

106. Divertor detachment and re-attachment studies with mixed impurity seeding on ASDEX Upgrade

Stuart Henderson (UKAEA)

10/11/2022, 10:30

Radiative Power Exhaust

Oral

In GW-scale fusion power plants, most of the alpha heating power must be radiated from the edge plasma on closed field lines and the remaining fraction radiated in the scrape-off layer to reduce the surface heat flux and material erosion rate in the divertor below tolerable values. A mixture of impurities with radiation efficiencies tailored to the distinctly different regions of plasma within...

92. Overview of Exhaust Physics Results from MAST-U

Dr Peter Ryan (UKAEA)

10/11/2022, 10:50

Radiative Power Exhaust

Oral

The particle and power exhaust solution in fusion reactors needs to produce tolerable power loads on plasma-facing-components and be compatible with the high-performance fusion core. Alternative divertor configurations should be explored to mitigate the risk that the ITER solution, a single null divertor with a high radiation fraction in the scrape-off-layer (SOL), does not extrapolate to...

97. Compact radiative divertor experiments at ASDEX Upgrade extrapolated to DEMO

Tilmann Lunt (Max-Planck-Institut für Plasmaphysik)

10/11/2022, 11:10

Radiative Power Exhaust

Oral

One of the most promising approaches to tackle the power exhaust problem in a divertor tokamak is the so called X-point radiator (XPR). By the controlled injection of impurities into the plasma a radiation cloud localized in the vicinity of the X-point is formed. It was shown that up to 95% of the power absorbed in the plasma can be dissipated before reaching the divertor targets [1]. Recent...