Scrape-off layer reflectometer for Alcator C-Mod

Cornwall Lau; Greg Hanson; John Wilgen; Yijun Lin; Steve Wukitch

doi:10.1063/1.3491225

Scrape-off layer reflectometer for Alcator C-Mod

Cornwall Lau, Greg Hanson, John Wilgen, Yijun Lin, Steve Wukitch

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

7 Scopus citations

Abstract

A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna. The system is planned to operate between 100 and 146 GHz at sweep rates from 10 μs to 1 ms, and will cover a density range of approximately 10¹⁶ - 10²⁰ m^-3 at B₀ =5-5.4 T. To minimize the effects of density fluctuations, both differential phase and full phase reflectometry will be employed. Design, test data, and calibration results of this electronics system will be discussed. To reduce attenuation losses, tallguide (TE₀₁) will be used for most of the transmission line system. Simulations of high mode conversion in tallguide components, such as e-plane hyperbolic secant radius of curvature bends, tapers, and horn antennas will be shown. Experimental measurements of the total attenuation losses of these components in the lower hybrid waveguide run will also be presented.

Original language	English
Article number	10D918
Journal	Review of Scientific Instruments
Volume	81
Issue number	10
DOIs	https://doi.org/10.1063/1.3491225
State	Published - Oct 2010
Externally published	Yes

Funding

This work was supported by the U.S. DoE under Grant Nos. DE-AC05–00OR22725 and DE-FC02–99ER54512.

Funders	Funder number
U.S. Department of Energy	DE-FC02–99ER54512, DE-AC05–00OR22725

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/1.3491225

Cite this

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title = "Scrape-off layer reflectometer for Alcator C-Mod",

abstract = "A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna. The system is planned to operate between 100 and 146 GHz at sweep rates from 10 μs to 1 ms, and will cover a density range of approximately 1016 - 1020 m-3 at B0 =5-5.4 T. To minimize the effects of density fluctuations, both differential phase and full phase reflectometry will be employed. Design, test data, and calibration results of this electronics system will be discussed. To reduce attenuation losses, tallguide (TE01) will be used for most of the transmission line system. Simulations of high mode conversion in tallguide components, such as e-plane hyperbolic secant radius of curvature bends, tapers, and horn antennas will be shown. Experimental measurements of the total attenuation losses of these components in the lower hybrid waveguide run will also be presented.",

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doi = "10.1063/1.3491225",

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AU - Lau, Cornwall

AU - Hanson, Greg

AU - Wilgen, John

AU - Lin, Yijun

AU - Wukitch, Steve

PY - 2010/10

Y1 - 2010/10

N2 - A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna. The system is planned to operate between 100 and 146 GHz at sweep rates from 10 μs to 1 ms, and will cover a density range of approximately 1016 - 1020 m-3 at B0 =5-5.4 T. To minimize the effects of density fluctuations, both differential phase and full phase reflectometry will be employed. Design, test data, and calibration results of this electronics system will be discussed. To reduce attenuation losses, tallguide (TE01) will be used for most of the transmission line system. Simulations of high mode conversion in tallguide components, such as e-plane hyperbolic secant radius of curvature bends, tapers, and horn antennas will be shown. Experimental measurements of the total attenuation losses of these components in the lower hybrid waveguide run will also be presented.

AB - A swept-frequency X-mode reflectometer is being built for Alcator C-Mod to measure the scrape-off layer density profiles at the top, middle, and bottom locations in front of both the new lower hybrid launcher and the new ion cyclotron range of frequencies antenna. The system is planned to operate between 100 and 146 GHz at sweep rates from 10 μs to 1 ms, and will cover a density range of approximately 1016 - 1020 m-3 at B0 =5-5.4 T. To minimize the effects of density fluctuations, both differential phase and full phase reflectometry will be employed. Design, test data, and calibration results of this electronics system will be discussed. To reduce attenuation losses, tallguide (TE01) will be used for most of the transmission line system. Simulations of high mode conversion in tallguide components, such as e-plane hyperbolic secant radius of curvature bends, tapers, and horn antennas will be shown. Experimental measurements of the total attenuation losses of these components in the lower hybrid waveguide run will also be presented.

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Scrape-off layer reflectometer for Alcator C-Mod

Abstract

Funding

UN SDGs

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