1. Design of a low frequency, density profile reflectometer system for the MAST-U spherical tokamak.
- Author
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Rhodes, T. L., Peebles, W. A., Zeng, Lei, Hall-Chen, Valerian, Ronald, Kevin, Kubota, S., Meng, Yusong, Lantsov, R., Michael, C. M., Crocker, N. A., and Scannell, R.
- Subjects
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ELECTRON density , *LANGMUIR probes , *REFLECTOMETRY , *PLASMA frequencies , *SPATIAL resolution , *THOMSON scattering - Abstract
Validated and accurate edge profiles (temperature, density, etc.) are vitally important to the Mega Ampere Spherical Tokamak Upgrade (MAST-U) divertor and confinement effort. Density profile reflectometry has the potential to significantly add to the measurement capabilities currently available on MAST-U (e.g., Thomson scattering and Langmuir probes). This work presents the diagnostic requirements, problems, and solutions facing profile reflectometry in spherical tokamaks and MAST-U in particular. Requirements include density measurements near zero electron density in the scrape off layer region, coverage for a broad range of MAST-U plasma parameters, high time (≤10 microseconds) and spatial resolutions (≤1 cm), reliability, and identification of the plasma start frequency. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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