A5090472779- Magnetic confinement fusion research
- Fusion materials and technologies
- Particle Detector Development and Performance
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Nuclear Materials and Properties
- Geophysical Methods and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- High-Energy Particle Collisions Research
TU Wien
2023-2024
University of Vienna
2024
A new shattered pellet injection system was designed and built to perform disruption mitigation experiments on ASDEX Upgrade. The can inject pellets with diameters of 1, 2, 4, or 8 mm variable lengths over a range L/D ratios ∼0.5-1.5. By using helium deuterium as propellant gas, the be accelerated speeds between 60 750 m/s. velocity slightly depends mass. is capable preparing three in separate barrels at same time. Once by gas pulse, travel through one parallel flight tubes. Each tube...
In support of the ITER disruption mitigation system (DMS), a highly flexible, triple-barrel shattered pellet injection (SPI) was installed at ASDEX Upgrade and tested in 240 dedicated discharges 2022 experimental campaign. Prior to tokamak experiments, commissioned characterised laboratory environment. this paper we discuss experience gained from 2000 launches on freezing launching process for 4 mm 8 diameter pellets made deuterium, neon their mixtures. Different amounts inside as well...
The lifetime and utilization of a nuclear fusion reactor like ITER depends strongly on its capabilities to mitigate damage during disruptions. While shattered pellet injection (SPI) was chosen as the baseline mitigation method for ITER, exact relation parameters resulting fragment distributions is not yet clear. This knowledge paramount importance optimizing impurity deposition disruption efficiency. In this thesis, I present fragmentation analysis 170 SPI pellets, with focus produced sizes...
Future large tokamaks will operate at high plasma currents and stored energies. To ensure machine protection in case of a sudden loss confinement (major disruption), fraction the magnetic thermal energy must be radiated to reduce loads. The disruption mitigation system for ITER is based on massive material injection form shattered pellet (SPI). support ITER, versatile SPI was installed tokamak ASDEX Upgrade (AUG). AUG features three independent generation cells guide tubes, each equipped...
Abstract Plasma disruptions pose an intolerable risk to large tokamaks, such as ITER. If a disruption can no longer be avoided, ITER’s last line of defense will the Shattered Pellet Injection. An experimental test bench was created at ASDEX Upgrade inform design decisions for controlling shattering pellets and develop techniques generation fragment distributions necessary optimal mitigation. In effort analyze videos resulting from more than 1000 tests determine impact different settings on...
Abstract Shattered pellet injection (SPI) is a promising method for controlling plasma disruptions in tokamaks. In this study, we present numerical modelling of the fragmentation cryogenic deuterium pellets within context SPI, using peridynamic (PD) theory. A dedicated in-house code has been developed, leveraging meshfree and GPU parallelization. The mechanical properties solid are obtained from available literature, calibrated based on shatter threshold along with remaining mass fraction...
Shattered Pellet Injection (SPI) is considered as a method to effectively mitigate the effect of severe disruptions in tokamaks. For development SPI technology ITER, Centre for Energy Research, collaboration with H-ion Kft and VTMT Kft, designed, constructed operates Disruption Mitigation System (DMS) Support Laboratory. To simulate pellet acceleration, we developed zero-dimensional model. The model uses parameters material, propellant gas characteristics, dimension barrel fast valve (FV),...