Sample interview questions: How do you approach the assessment and control of plasma instabilities in magnetically confined fusion devices?
Sample answer:
Assessment of Plasma Instabilities
- Diagnostics: Utilize advanced diagnostic techniques such as reflectometry, microwave scattering, and fast-ion Doppler shift spectroscopy to detect and characterize instabilities.
- Simulation and Modeling: Employ computational models and simulations to predict instability onset, growth rates, and impact on plasma performance.
- Experimental Observation: Monitor plasma parameters (e.g., temperature, density) and visually observe instability signatures (e.g., edge localized modes, magnetohydrodynamic bursts) in real-time.
Control of Plasma Instabilities
- Active Feedback Control: Implement real-time feedback systems that use actuators (e.g., magnetic coils, radio frequency antennas) to suppress instabilities by modifying plasma parameters.
- Passive Mitigation Techniques: Optimize plasma shape, magnetic field configuration, and edge conditions to reduce instability growth and minimize impact.
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