Calibration of a 32 channel electron cyclotron emission radiometer on the HL-2A tokamak

Shi, Z.B.; Jiang, Min; Huang, Xianli; Zhong, W.L.; Chen, W.; L., Y.; Liu, Z. T.; Ding, X.T.; Yang, Q. W.; Duan, Xuru

doi:10.1063/1.4866640

Cited by 72 publications

(38 citation statements)

References 8 publications

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“…The parameters in this discharge are as follows: major radius

, minor radius

, magnetic field

, plasma current

, and background electron density

. Figure 1 shows the temporal evolution of plasma parameters of a typical discharge, where the electron temperature

is measured at normalized radius

with an electron cyclotron emission (ECE) radiometer [ 14 ] and the line-average density

is measured with a far infrared rays (FIR) laser interferometer [ 15 ]. Plasma current

is kept stable from 200 ms to 1700 ms.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of perturbative particle transport in the HL-2A tokamak

Zhang

Inagaki

Shi

et al. 2020

Heliyon

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Perturbative particle transport experiment has been performed in the HL-2A tokamak by using supersonic molecular beam injection (SMBI) as an external particle source. The spatiotemporal evolution of edge density perturbation is traced and the particle source and the flux-gradient relation are obtained experimentally. The flux-gradient relation is found to be far from the diffusive model and three different transport processes are revealed, including pinch-dominant process, diffusion-pinch process and intermittent decays.

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“…The parameters in this discharge are as follows: major radius

, minor radius

, magnetic field

, plasma current

, and background electron density

. Figure 1 shows the temporal evolution of plasma parameters of a typical discharge, where the electron temperature

is measured at normalized radius

with an electron cyclotron emission (ECE) radiometer [ 14 ] and the line-average density

is measured with a far infrared rays (FIR) laser interferometer [ 15 ]. Plasma current

is kept stable from 200 ms to 1700 ms.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of perturbative particle transport in the HL-2A tokamak

Zhang

Inagaki

Shi

et al. 2020

Heliyon

Self Cite

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“…The waveform V (t) via the dynamic calibration described in previous section is shown in figure 4(d) with the dispersion of all the optical path concerned. density profiles during tearing mode, synchronized with the temperature signal from the electron cyclotron emission (ECE) radiometer [13], which indicates the density and temperature profiles are modulated by the rotation of the island.…”

Section: Setup Of the Vco Control Waveformsmentioning

confidence: 99%

Application of dynamic calibration and control waveform optimization techniques in the fast sweeping reflectometer upgrade on the HL-2A tokamak

et al. 2021

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High temporal-spatial density profiles, measured by the frequency modulated continuous wave (FMCW) reflectometer, are crucial for the study of particle transport and confinement, especially for the transient events. However, the conventional calibration methods and control waveform of the voltage controlled oscillator (VCO) source constraint the increase of the sweeping frequency (time resolution) and the accuracy of the probed location of the FMCW. In this work, two methods of dynamic calibration of the VCO are proposed to reduce the measurement error due to the high sweep rate, and the results are found to be consistent with each other. In addition, the control waveform of VCOs are re-designed considering the VCO calibration results and dispersions of the waveguide and cables. Therefore, the sweep/dead time has been shortened to be 10 μs/50 ns from 25 μs/5 μs and the accuracy of the detection location has been improved significantly. The density profiles and density fluctuations during the tearing modes are presented which demonstrate the capability of the upgraded reflectometer.

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“…The shape of the electron density profile is assumed to be the same as that of the similar discharge #25733. [12] The electron and thermal ion temperature profiles are measured through electron cyclotron emission [15] and charge exchange recombination [16] diagnosis systems, respectively. Fast ion profiles are output from NUBEAM [17] calculation.…”

Section: Physical Model In the Gene Code And Numerical Setupmentioning

confidence: 99%

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

Lin¹,

Li²,

García³

et al. 2023

Chinese Phys. B

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Turbulence characteristics of plasmas with the internal transport barriers in HL‐2A tokamak are analyzed by means of linear gyrokinetic simulations. It is found that turbulence is dominated by the Ion Temperature Gradient (ITG) mode together with large scale modes characterized by high‐frequency electromagnetic fluctuation, which are destabilized by the steep ion temperature gradient in weak magnetic shear regime. Comparison with solutions of analytical dispersion relations shows that their linear features match well with the beta‐induced Alfven eigenmode (BAE) branch of shear Alfvenic spectrum. It is further clarified that the large population of fast ions in these plasmas play a stabilization role through the dilution mechanism in high‐n ITG mode regimes.

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Calibration of a 32 channel electron cyclotron emission radiometer on the HL-2A tokamak

Cited by 72 publications

References 8 publications

Experimental study of perturbative particle transport in the HL-2A tokamak

Experimental study of perturbative particle transport in the HL-2A tokamak

Application of dynamic calibration and control waveform optimization techniques in the fast sweeping reflectometer upgrade on the HL-2A tokamak

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

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