Conveners
Consequences
- Fabio Villone (DIETI, Università degli Studi di Napoli Federico II)
Consequences
- Fabio Villone (DIETI, Università degli Studi di Napoli Federico II)
Consequences
- There are no conveners in this block
Consequences
- There are no conveners in this block
The potential of localized heat loads under disruptions to cause considerable melting of plasma-facing components (PFC) has been extensively investigated. Two distinctive regimes exist, which lead to different types of PFC damage and necessitate different modelling approaches; surface loading and volumetric loading.
Surface heating is caused by electrons and ions with energies in the...
Extreme high transient heat flux up to thousands of MW/m2 in a short pulse (~ms) during disruption in future large scale tokamak imposes great challenge on plasma facing components (PFCs), which is very concerned and worried by the ITER. Currently, understanding the consequence of thermal damage behaviors on W PFC by is an critical issue. EAST, as a superconducting tokamak, is installed metal...
During tokamak disruptions, the magnetic surfaces are broken creating large regions of chaotic magnetic field lines. The physics associated with post-disruption chaotic magnetic fields needs be understood to address force, heat, and runaway electron loading on the walls. Direct simulations are too challenging to allow parameter scans and have uncertainties that can only be addressed by a...
Since the RE generation during tokamak disruption is exponentially sensitive to initial plasma current, highly energetic RE beams pose a critical challenge for future tokamaks. Accurate simulations of tokamak disruptions are therefore essential for the development of successful mitigation strategies and safe operation. However, when simulating such disruptions, fluid plasma models are often...
In 1996, during a disruption, 3 hundred tonnes of JET vacuum vessel moved by 7 mm sideways. In spite of significant efforts to understand the phenomena, the horizontal force on the tokamak wall during plasma disruptions still remains poorly understood. For example, the predictions for ITER vary greatly, from 2 to 60 MN, with the upper estimate exceeding the design margin of 48 MN. To resolve...
The talk begins with an overview of several consequent steps in evaluation of the pulsed EM loads in tokamaks and concentrates on calculation of AVDE-induced loads in ITER. The presented practical EM model uses the superposition of two patterns of the halo current: one perfectly symmetric and another perfectly anti-symmetric. It combines the following features of two recent trial models: (a)...
Electromagnetic (and thermal) loads during vertical displacement events (VDEs) are of major concerns in tokamaks, and in future pilot plants that are based on this concept. In particular, Alcator C-Mod has been used to study disruptions from planned as well as unexpected VDEs, and where halo currents were well analyzed in the disrupting plasma [1,2]. Therefore, it offers comprehensive hot and...
In tokamaks, eddy currents and associated forces, driven by rapid current quenches during disruptions are important drivers for structural engineering requirements. Additionally, recent interest in disruption-driven 3D currents, such as the Runaway Electron Mitigation Coil (REMC) concept, further motivates the need to capture currents in passive conducting structures early in and throughout...
During the thermal quench (TQ), the stored thermal energy is released with a short timescale and might cause serious damage to plasma-facing components (PFCs), especially in future large-scale tokamaks. Here presents the detailed description of the TQ database consisting of 164 disruption discharges, including both major disruptions (MDs) and hot vertical displacement events (VDEs), on EAST...
