Millimeter-wave high-wavenumber scattering diagnostic developments on EAST and NSTX-U

Pengjun Sun; Xianzi Liu; Yang Ren; Guosheng Xu; Ran Chen; Jing Qian; Xiaoliang Li; Calvin Domier; Jon Dannenberg; Ke Yao; Yilun Zhu; Neville Luhmann

doi:10.1063/5.0219393

Millimeter-wave high-wavenumber scattering diagnostic developments on EAST and NSTX-U

Pengjun Sun
, Xianzi Liu
, Yang Ren
, Guosheng Xu
, Ran Chen
, Jing Qian
, Xiaoliang Li
, Calvin Domier
, Jon Dannenberg
, Ke Yao
, Yilun Zhu
, Neville Luhmann

PPPL NSTX

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

8 Scopus citations

Abstract

A pioneering 4-channel, high-k poloidal, millimeter-wave collective scattering system has been successfully developed for the Experimental Advanced Superconducting Tokamak (EAST). Engineered to explore high-k electron density fluctuations, this innovative system deploys a 270 GHz mm-wave probe beam launched from Port K and directed toward Port P (both ports lie on the midplane and are 110° part), where large aperture optics capture radiation across four simultaneous scattering angles. Tailored to measure density fluctuations with a poloidal wavenumber of up to 20 cm⁻¹, this high-k scattering system underwent rigorous laboratory testing in 2023, and the installation is currently being carried out on EAST. Its primary purpose lies in scrutinizing ion and electron-scale instabilities, such as the electron temperature gradient (ETG) mode, by furnishing measurements of the k_θ (poloidal wavenumber) spectrum. This advancement significantly bolsters the capacity to probe high-k electron density fluctuations within the framework of EAST. Beam tracing and data interpretation modules developed for both EAST and NSTX-U high-k scattering diagnostics are described.

Original language	English (US)
Article number	083553
Journal	Review of Scientific Instruments
Volume	95
Issue number	8
DOIs	https://doi.org/10.1063/5.0219393
State	Published - Aug 1 2024

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/5.0219393

Cite this

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title = "Millimeter-wave high-wavenumber scattering diagnostic developments on EAST and NSTX-U",

abstract = "A pioneering 4-channel, high-k poloidal, millimeter-wave collective scattering system has been successfully developed for the Experimental Advanced Superconducting Tokamak (EAST). Engineered to explore high-k electron density fluctuations, this innovative system deploys a 270 GHz mm-wave probe beam launched from Port K and directed toward Port P (both ports lie on the midplane and are 110° part), where large aperture optics capture radiation across four simultaneous scattering angles. Tailored to measure density fluctuations with a poloidal wavenumber of up to 20 cm−1, this high-k scattering system underwent rigorous laboratory testing in 2023, and the installation is currently being carried out on EAST. Its primary purpose lies in scrutinizing ion and electron-scale instabilities, such as the electron temperature gradient (ETG) mode, by furnishing measurements of the kθ (poloidal wavenumber) spectrum. This advancement significantly bolsters the capacity to probe high-k electron density fluctuations within the framework of EAST. Beam tracing and data interpretation modules developed for both EAST and NSTX-U high-k scattering diagnostics are described.",

author = "Pengjun Sun and Xianzi Liu and Yang Ren and Guosheng Xu and Ran Chen and Jing Qian and Xiaoliang Li and Calvin Domier and Jon Dannenberg and Ke Yao and Yilun Zhu and Neville Luhmann",

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doi = "10.1063/5.0219393",

language = "English (US)",

volume = "95",

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AU - Sun, Pengjun

AU - Liu, Xianzi

AU - Ren, Yang

AU - Xu, Guosheng

AU - Chen, Ran

AU - Qian, Jing

AU - Li, Xiaoliang

AU - Domier, Calvin

AU - Dannenberg, Jon

AU - Yao, Ke

AU - Zhu, Yilun

AU - Luhmann, Neville

PY - 2024/8/1

Y1 - 2024/8/1

N2 - A pioneering 4-channel, high-k poloidal, millimeter-wave collective scattering system has been successfully developed for the Experimental Advanced Superconducting Tokamak (EAST). Engineered to explore high-k electron density fluctuations, this innovative system deploys a 270 GHz mm-wave probe beam launched from Port K and directed toward Port P (both ports lie on the midplane and are 110° part), where large aperture optics capture radiation across four simultaneous scattering angles. Tailored to measure density fluctuations with a poloidal wavenumber of up to 20 cm−1, this high-k scattering system underwent rigorous laboratory testing in 2023, and the installation is currently being carried out on EAST. Its primary purpose lies in scrutinizing ion and electron-scale instabilities, such as the electron temperature gradient (ETG) mode, by furnishing measurements of the kθ (poloidal wavenumber) spectrum. This advancement significantly bolsters the capacity to probe high-k electron density fluctuations within the framework of EAST. Beam tracing and data interpretation modules developed for both EAST and NSTX-U high-k scattering diagnostics are described.

AB - A pioneering 4-channel, high-k poloidal, millimeter-wave collective scattering system has been successfully developed for the Experimental Advanced Superconducting Tokamak (EAST). Engineered to explore high-k electron density fluctuations, this innovative system deploys a 270 GHz mm-wave probe beam launched from Port K and directed toward Port P (both ports lie on the midplane and are 110° part), where large aperture optics capture radiation across four simultaneous scattering angles. Tailored to measure density fluctuations with a poloidal wavenumber of up to 20 cm−1, this high-k scattering system underwent rigorous laboratory testing in 2023, and the installation is currently being carried out on EAST. Its primary purpose lies in scrutinizing ion and electron-scale instabilities, such as the electron temperature gradient (ETG) mode, by furnishing measurements of the kθ (poloidal wavenumber) spectrum. This advancement significantly bolsters the capacity to probe high-k electron density fluctuations within the framework of EAST. Beam tracing and data interpretation modules developed for both EAST and NSTX-U high-k scattering diagnostics are described.

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Millimeter-wave high-wavenumber scattering diagnostic developments on EAST and NSTX-U

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