Development of Thomson scattering system on VEST

Kim, Young-Gi; Kim, Doyeon; Lee, Jong-Ha; Yoo, Min-Gu; Lee, HyunYeong; Kim, SeongCheol; Lee, Chanyoung; Kim, YooSung; Hwang, Y.S.; Na, Yong-Su

doi:10.1016/j.fusengdes.2019.03.130

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…In the Versatile Experiment Spherical Torus (VEST) [6], a Thomson scattering diagnostic and triple probe have been utilized to measure local T e profiles. The Thomson scattering diagnostic measures five locations simultaneously but only every 1 ms [7], and the triple probe covers only edge plasmas, not the core region. These two diagnostics are therefore not sufficient to obtain radial T e profiles with high temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST

Lee,

Lim,

Jeong

et al. 2023

Sensors

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A multichannel soft X-ray (SXR) array has been developed to measure the electron temperature in the Versatile Experiment Spherical Torus (VEST). To estimate electron temperature using the two-filter method applied to SXR intensity, we designed a pinhole camera that has two photodiode arrays with different metallic filters. We also adopted a filter wheel and tested various filter parameters to find the optimal filter set. Through tests, the combination of aluminum and beryllium was found to be the most suitable for the current experimental conditions in VEST. The filtered SXR signals were acquired with a low-noise preamplifier, exhibiting sufficient signal-to-noise ratios for electron temperature estimation based on the intensity ratio of two signals obtained with different filters. The estimated electron temperature from the developed two-filter SXR array showed reasonably matched levels and consistent trends with Thomson scattering measurements. Error contribution from impurity line emission is also discussed.

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Section: Introductionmentioning

confidence: 99%

Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST

Lee,

Lim,

Jeong

et al. 2023

Sensors

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“…The measurements of plasma electron temperature (𝑇 e ) and density (𝑛 e ) profiles are critical in tokamak fusion research, such as the issues of pedestal physics, plasma turbulence and transport. Thomson scattering (TS) system is a significant diagnostic to simultaneously measure the electron temperature and density profiles, which has been installed in multiple tokamak devices [1][2][3]. The studies of pedestal structure and relevant edge localized modes behavior in H-mode plasma rely on the high spatial resolution measurements of edge temperature and density since the width of pedestal is generally only 1-2 cm and the location of the pedestal is about 0.8-1.1 𝜌 [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Design of an edge TV Thomson scattering diagnostic system on EAST

Ren

Zang

2021

J. Inst.

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The study of the edge plasma has significant effect for the performance improvement of magnetic confinement. However, the Thomson scattering system, which has been used to provide electron temperature and electron density on EAST, do not meet the requirements for the edge plasma measurements in measurement region, spatial and spectral resolution. Herein, a TV Thomson scattering diagnostic system has been constructed for the measurements of edge electron temperature and electron density profiles on EAST. A new laser system, optical collection system and data acquisition system are designed to enable the TV Thomson system operate at the measurement region of 0.65–1.1 ρ (“ρ” is the unitary radius in flux coordinate) with spectral resolution of 5 nm and spatial resolution as low as 2 mm. And the theoretical analysis proves that the system has the measurability at electron temperature of 20–1000 eV and density beyond 0.2 × 1019 m-3, which fulfills research of the pedestal microstructure on EAST. The establishment of the edge TV Thomson system can create the conditions for the edge physical study on EAST.

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Investigation of the effect of pre-fill gas in VEST discharges by predictive transport simulations

Lee

Kim

et al. 2022

J. Korean Phys. Soc.

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Development of Thomson scattering system on VEST

Cited by 7 publications

References 14 publications

Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST

Electron Temperature Measurements Using a Two-Filter Soft X-ray Array in VEST

Design of an edge TV Thomson scattering diagnostic system on EAST

Investigation of the effect of pre-fill gas in VEST discharges by predictive transport simulations

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