Sample interview questions: Have you ever conducted experiments related to plasma turbulence control in magnetized plasmas? If so, can you provide details?
Sample answer:
Yes, I have conducted experiments related to plasma turbulence control in magnetized plasmas. Here are some details:
- Experimental Setup:
- We employed a linear magnetized plasma device with dimensions of 10 m in length and 1 m in diameter.
- The plasma was generated using an electron cyclotron resonance (ECR) plasma source.
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A strong magnetic field (up to 1 Tesla) was applied along the axis of the device.
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Diagnostics:
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We used various diagnostics to measure plasma parameters and turbulence characteristics:
- Langmuir probes for measuring plasma density and electron temperature.
- Microwave reflectometry for measuring electron density profiles.
- Fast-framing cameras for visualizing plasma turbulence.
- Spectrometers for measuring spectral characteristics of plasma emissions.
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Experimental Procedure:
- We generated a magnetized plasma in the device and then excited plasma turbulence by injecting a small amount of neutral gas.
- We varied plasma parameters such as density, temperature, and magnetic field strength to study their effects on turbulence behavior.
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We also applied various control techniques to mitigate turbulence, including:
- Injection of energetic electrons using electron cyclotron resonance heating (ECRH)
- Modulation of the magnetic field using a rotating magnetic field (RMF)
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