The National Spherical Torus Experiment-Upgrade poloidal high-k scattering system pitch angle design modifications

Liu, X.; Domier, C. W.; Dannenberg, J.; Zhu, Y.; Sirigiri, J. R.; Ren, Y.; Stratton, B.; Luhmann, N. C.

doi:10.1063/5.0099912

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Research Article| October 06 2022

The National Spherical Torus Experiment-Upgrade poloidal high-k scattering system pitch angle design modifications

Special Collection: Proceedings of the 24th Topical Conference on High-Temperature Plasma Diagnostics

X. Liu

0000-0002-7881-2880

;

X. Liu ^a)

(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing)

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

^a)Author to whom correspondence should be addressed: [email protected]

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C. W. Domier

0000-0002-8080-7773

;

C. W. Domier

(Conceptualization, Investigation, Methodology, Project administration, Visualization, Writing – original draft, Writing – review & editing)

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

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J. Dannenberg;

J. Dannenberg

(Investigation, Visualization)

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

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Y. Zhu

0000-0003-2842-8474

;

Y. Zhu

(Funding acquisition, Project administration)

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

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J. R. Sirigiri;

J. R. Sirigiri

(Investigation)

2

Bridge 12 Technologies, Inc.

, 37 Loring Drive, Framingham, Massachusetts 01702,

USA

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Y. Ren

0000-0003-4571-9046

;

Y. Ren

(Conceptualization, Data curation, Supervision, Validation)

3

Princeton Plasma Physics Laboratory

, 100 Stellarator Rd., Princeton, New Jersey 08540,

USA

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B. Stratton;

B. Stratton

(Supervision)

3

Princeton Plasma Physics Laboratory

, 100 Stellarator Rd., Princeton, New Jersey 08540,

USA

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N. C. Luhmann, Jr.

(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – review & editing)

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

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Author & Article Information

X. Liu

^{^{https://orcid.org/0000-0002-7881-2880}}

^1,a)

,

C. W. Domier

^{^{https://orcid.org/0000-0002-8080-7773}}

¹

,

J. Dannenberg ¹

,

Y. Zhu

^{^{https://orcid.org/0000-0003-2842-8474}}

¹

,

J. R. Sirigiri ²

,

Y. Ren

^{^{https://orcid.org/0000-0003-4571-9046}}

³

,

B. Stratton ³

,

N. C. Luhmann, Jr. ¹

1

University of California at Davis

, 1 Shields Ave., Davis, California 95616,

USA

2

Bridge 12 Technologies, Inc.

, 37 Loring Drive, Framingham, Massachusetts 01702,

USA

3

Princeton Plasma Physics Laboratory

, 100 Stellarator Rd., Princeton, New Jersey 08540,

USA

^a)Author to whom correspondence should be addressed: [email protected]

Note: This paper is part of the Special Topic on Proceedings of the 24th Topical Conference on High-Temperature Plasma Diagnostics.

Rev. Sci. Instrum. 93, 103509 (2022)

https://doi.org/10.1063/5.0099912

CHORUS

A 693 GHz, eight-channel, poloidal high-k (k refers to wavenumber) collective scattering system is under development for the National Spherical Torus Experiment-Upgrade device. It will replace the previous 280 GHz, five-channel, tangential scattering system to study high-k electron density fluctuations, thereby providing a measurement of the k_θ-spectrum of both electron temperature gradient and ion temperature gradient modes. A tool is under development to calculate the wavenumber that exists in the presence of strong magnetic pitch angles. We use this tool to motivate a new receiver optical design for significantly improved performance, details of which are presented herein.

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