Conveners
Towards Integrated Scenarios for Exhaust
- Matthijs van Berkel (DIFFER)
Towards Integrated Scenarios for Exhaust
- Matthijs van Berkel (DIFFER)
Power exhaust is a crucial issue for future fusion reactors. To reach the required 95% dissipation of the exhaust power, impurities must be injected into the plasma. With strong impurity seeding the radiation concentrates in a small region inside the confined plasma, forming the X-point radiator (XPR). The XPR is observed in almost all currently operating tokamaks and was, in JET, first...
Managing the power exhausted from the core fusion plasma towards the reactor wall remains a major challenge for fusion energy. Since this exhaust power fluctuates due to plasma disturbances, active power exhaust control is essential for reactors: a loss of detachment leads to target destruction while excessive cooling can trigger a highly damaging disruption. However, maintaining acceptable...
The Ne-seeded JET-ITER baseline is a robust scenario that can achieve simultaneous partial divertor detachment and high-confinement (H$_{98}$ > 0.85-1.0) with small or no ELMs at JET [1, 2, 3]. In these highly fuelled, high-triangularity scenarios with vertical target divertor configuration, Ne-seeding opens access to reduced pedestal top electron density, $n_\text{e,PED}$, with low pedestal...
Control of particle recycling and neutral pressure in the divertor is a key challenge in sustaining high-performance, steady-state operation in fusion devices. This presentation highlights recent developments in the Large Helical Device (LHD), where a Closed Helical Divertor (CHD) with in-vessel pumping has been implemented to enhance neutral compression and control recycling.
The first part...
Recent dedicated experiments combined with a new modeling suite have advanced the crucial topic of core edge integration and power exhaust for fusion plasmas substantially. We report on experimental findings with reactor relevant seeding gases that establish a core edge integrated boundary solution. A new core-edge integrated modeling framework has been validated on these experiments and is...
The tokamak divertor is subjected to huge heat load, including both the transient heat load due to the edge localized modes (ELMs) and steady-state heat load in between ELMs. Exploring the edge plasma solution compatible with the high-performance plasma is one of the key issues to achieve high-performance steady-state operation of magnetically-confined fusion reactors in the future.
Numerical...
