Design of a low frequency, density profile reflectometer system for the MAST-U spherical tokamak

T. L. Rhodes; W. A. Peebles; Lei Zeng; Valerian Hall-Chen; Kevin Ronald; S. Kubota; Yusong Meng; R. Lantsov; C. M. Michael; N. A. Crocker; R. Scannell

doi:10.1063/5.0219578

Design of a low frequency, density profile reflectometer system for the MAST-U spherical tokamak

T. L. Rhodes^*, W. A. Peebles, Lei Zeng, Valerian Hall-Chen, Kevin Ronald, S. Kubota, Yusong Meng, R. Lantsov, C. M. Michael, N. A. Crocker, R. Scannell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	083528
Journal	Review of Scientific Instruments
Volume	95
Issue number	8
DOIs	https://doi.org/10.1063/5.0219578
Publication status	Published - 14 Aug 2024

Keywords

Mega Ampere Spherical Tokamak Upgrade
reflectometry

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10.1063/5.0219578

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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.",

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AU - Rhodes, T. L.

AU - Peebles, W. A.

AU - Zeng, Lei

AU - Hall-Chen, Valerian

AU - Ronald, Kevin

AU - Kubota, S.

AU - Meng, Yusong

AU - Lantsov, R.

AU - Michael, C. M.

AU - Crocker, N. A.

AU - Scannell, R.

PY - 2024/8/14

Y1 - 2024/8/14

N2 - 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.

AB - 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.

KW - Mega Ampere Spherical Tokamak Upgrade

KW - reflectometry

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DO - 10.1063/5.0219578

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Design of a low frequency, density profile reflectometer system for the MAST-U spherical tokamak

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Keywords

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