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Development of a multi-channel mm-wave interferometer for the versatile experiment spherical torus (VEST)
1Department of Energy Systems Engineering, Seoul National University, Seoul 08826, Republic of Kore.
The Review of Scientific Instruments
|April 7, 2025
Summary
A multi-channel interferometer now measures electron density profiles on the versatile experiment spherical torus. This upgrade enhances plasma diagnostics by providing detailed, real-time data for fusion research.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Diagnostic Instrumentation
Background:
- The versatile experiment spherical torus (VEST) requires advanced diagnostics for plasma characterization.
- Electron density measurements are crucial for understanding plasma behavior and confinement in fusion devices.
Purpose of the Study:
- To upgrade the existing 94 GHz single-channel interferometer into a multi-channel system.
- To enable precise electron density profile measurements within the VEST plasma.
Main Methods:
- Implemented a five-channel heterodyne interferometer using Gaussian beam optics.
- Optimized the optical system with CODE V software based on Gaussian beam approximation.
- Verified system performance through single-channel tests and comparison with a V-band interferometer.
- Acquired multi-channel data and validated against 1 kHz Thomson scattering measurements.
Main Results:
- Successfully upgraded the interferometer to a multi-channel configuration.
- Achieved vertical electron density profile measurements with 75 mm spacing.
- Demonstrated good agreement between interferometer data and Thomson scattering measurements.
Conclusions:
- The upgraded multi-channel interferometer is a reliable tool for electron density profile measurements in VEST.
- This advancement improves plasma diagnostic capabilities for fusion energy research.
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