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Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST
1Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Sensors (Basel, Switzerland)
|October 28, 2023
Summary
A new multichannel soft X-ray (SXR) array effectively measures electron temperature in the Versatile Experiment Spherical Torus (VEST). This SXR array uses a two-filter method, providing accurate temperature data consistent with Thomson scattering measurements.
Area of Science:
- Plasma physics
- Fusion energy research
- Diagnostic instrumentation
Background:
- Accurate electron temperature measurement is crucial for understanding and controlling plasma behavior in fusion devices.
- The Versatile Experiment Spherical Torus (VEST) requires advanced diagnostic tools for plasma characterization.
Purpose of the Study:
- To develop and validate a multichannel soft X-ray (SXR) array for electron temperature diagnostics in the VEST.
- To optimize the two-filter method using specific metallic filters for SXR intensity analysis.
Main Methods:
- Designed a pinhole camera with two photodiode arrays and different metallic filters (aluminum and beryllium).
- Utilized a filter wheel to test and identify the optimal filter combination for VEST conditions.
- Employed a low-noise preamplifier for acquiring filtered SXR signals with high signal-to-noise ratios.
Main Results:
- The aluminum and beryllium filter combination proved most suitable for VEST.
- The developed SXR array achieved sufficient signal-to-noise ratios for reliable electron temperature estimation.
- Estimated electron temperatures showed good agreement and consistent trends with Thomson scattering measurements.
Conclusions:
- The multichannel SXR array is a viable and effective diagnostic for measuring electron temperature in VEST.
- The two-filter method, with optimized filters, provides accurate plasma temperature data.
- Further analysis includes the impact of impurity line emission on measurement accuracy.
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