Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Wu, Tzi Yi; Zhang, Wei; Wang, Haoxi; Zhou, Yan; Yin, Zejie

doi:10.1088/2058-6272/aaaa19

Cited by 6 publications

(5 citation statements)

References 18 publications

(22 reference statements)

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“…and has achieved remarkable success [16][17][18]. Furthermore, the reverse shear Alfvén eigenmode (RSAE) has been successfully observed in HL-2A using a far-forward collective scattering diagnostic scheme [19].…”

Section: Jinst 17 P09037mentioning

confidence: 99%

Compact phase comparison system for the synthetic HCOOH laser diagnostic system in HL-2A

Zhang¹,

Wu²,

Li³

et al. 2022

J. Inst.

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Recently, a synthetic formic-acid laser diagnostic system has been deployed in HL-2A tokamak. However, the main electronics of the subsystems were discrete devices, and multimodal data analysis remained out of reach. In this work, we developed a novel compact high sensitivity Phasemeter (CHSP) system to integrate interferometer, far-forward collective scattering diagnostic (FCS), and Faraday effect polarimeter. It provides a framework for real-time intelligent diagnosis such as plasma disruptions prediction. We also propose a Synchronous Fast Fourier Transform (SFFT) method for suppression of spectral leakage and noise reduction. Experimental results indicate that the electronics system accuracy is about 1.0× 1015/m-3, which fully meets the requirements of HL-2A. This work represents a crucial step toward a high-performance intelligent diagnosis in HL-2A.

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Section: Jinst 17 P09037mentioning

confidence: 99%

Compact phase comparison system for the synthetic HCOOH laser diagnostic system in HL-2A

Zhang¹,

Wu²,

Li³

et al. 2022

J. Inst.

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“…In this method, the drive frequency of the modulator and resulting time constant of the density measurement are determined by the frequency bandwidth of the lock-in amplifier. A software lock-in technique [19] has more flexibility and extendibility. A similar, but more sophisticated algorithm for quadrature generation is being used on W7-X [16].…”

Section: Phase Modulationmentioning

confidence: 99%

Recent Progress on dispersion interferometers for nuclear fusion and low-temperature plasmas

et al. 2020

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A dispersion interferometer (DI) is known to be less sensitive to mechanical vibrations, which is one of the main sources of error for conventional interferometers. A simple optical configuration is also one of the advantages of the DI approach. Since the first application of a homodyne DI on a nuclear fusion plasma device in the 1990s, several interferometer techniques have improved the operation of the DI. Improvements in nonlinear crystals have also improved the performance and availability of the DI. Immunity to neutral gas density changes, which is needed 1Corresponding author.

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“…2 A synchronous demodulation system has been developed for HL-2M to get the amplitudes with the frequencies of 50 and 100 kHz [15]. After the input signal I(t) passes through a high-pass filter, it is mixed with the reference signal output by PEM.…”

Section: Basic Principle Of the DI And Demodulation Systemmentioning

confidence: 99%

Research on the real-time signal conditioning method for dispersion interferometer in HL-2M

Zhang

et al. 2020

Plasma Sci. Technol.

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A new CO 2 laser dispersion interferometer has been developed in the HL-2M tokamak to measure the electron density. In order to meet the needs of high-precision measurement, a data acquisition system with real-time signal conditioning (RSC) method is proposed. It can eliminate part of the impacts of environmental factors, such as mechanical vibration, light path changes, and plasma refraction effect during experiments. In harsh environments, the system can measure the line-integrated density with a high precision of 2×10 18 m −2 with the RSC method. The system has been tested in a recent HL-2A experimental campaign, and the results show that the RSC method plays an important role in the plasma electron density measurement.

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Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Cited by 6 publications

References 18 publications

Compact phase comparison system for the synthetic HCOOH laser diagnostic system in HL-2A

Compact phase comparison system for the synthetic HCOOH laser diagnostic system in HL-2A

Recent Progress on dispersion interferometers for nuclear fusion and low-temperature plasmas

Research on the real-time signal conditioning method for dispersion interferometer in HL-2M

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