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Design of the shattered pellet injection system for ASDEX Upgrade
M Dibon1, P de Marne1, G Papp1
1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, D-85748 Garching, Germany.
The Review of Scientific Instruments
|December 11, 2023
Summary
A novel shattered pellet injection system was developed for disruption mitigation studies on ASDEX Upgrade, enabling precise control over pellet size, velocity, and composition for enhanced experimental reproducibility.
Area of Science:
- Plasma Physics
- Fusion Energy Research
Background:
- Disruption mitigation is crucial for tokamak fusion devices.
- Previous pellet injection systems had limitations in control and reproducibility.
Purpose of the Study:
- To design and construct a new shattered pellet injection system for ASDEX Upgrade.
- To enhance precision and reproducibility in disruption mitigation experiments.
Main Methods:
- Developed a system capable of injecting pellets (1-8 mm diameter) with variable L/D ratios.
- Utilized helium or deuterium propellant gas for pellet acceleration (60-750 m/s).
- Incorporated automated gas preparation and control for pellet generation and shattered pellet experiments.
Main Results:
- The system allows for simultaneous preparation of three pellets.
- Variable pellet sizes and velocities (60-750 m/s) are achievable.
- Automated control ensures high precision in pellet composition and experimental reproducibility.
Conclusions:
- The new shattered pellet injection system significantly advances capabilities for fusion disruption mitigation research.
- The system's design offers precise control over key parameters, improving experimental outcomes.
