Progress of HL-2A physical experiments

Duan, Xuru; Zhong, W.L.

doi:10.1360/sspma2018-00284

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Therefore, it is suitable for detecting the electron density fluctuation of the plasma core with high time resolution. The frequency distribution of the MHD instabilities ranges from less than 1 kHz to hundreds of kHz [10]. Some density fluctuation frequency, such as reverse shear Alfven eigenmodes (RSAE), can reach above 80 kHz [8,9], while some Low-Frequency Zonal Flows (LFZF) frequency is lower than 4 kHz [11].…”

Section: Introductionmentioning

confidence: 99%

An FFT overlap method for high bandwidth far-infrared laser Interferometer in HL-2A

Zhang¹,

Wu²,

Li³

et al. 2021

J. Inst.

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A novel Real-Time High Bandwidth Phasemeter (RHBP) system has been developed for far-infrared laser interferometer in HL-2A tokamak. To meet the requirement of high-precision electron density fluctuation diagnostics, the system is based on the FFT overlap method, which can suppress the measurement error in high-bandwidth mode. The system consists of four Real-time Signal Conditioning (RSC) Modules and four RHBP Modules for high spatial resolution. Benefiting from the field-programmable gate array (FPGA) platform, the proposed method can be implemented with low noise and low cost. Experimental results suggest that the density resolution is 1.79× 1015/m-3 in high-bandwidth mode, which indicates that the proposed RHBP system achieves high performance for high-frequency fluctuation measurement.

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Section: Introductionmentioning

confidence: 99%

An FFT overlap method for high bandwidth far-infrared laser Interferometer in HL-2A

Zhang¹,

Wu²,

Li³

et al. 2021

J. Inst.

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The off-axis pressure crash associated with the nonlinear evolution of the m/n = 2/1 double tearing mode

Zhang

Lin

et al. 2020

Physics of Plasmas

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The nonlinear evolution of the m/n = 2/1 double tearing mode (DTM) is investigated by the toroidal resistive magnetohydrodynamic code CLT. It is found that the m/n = 2/1 DTM can lead to either a core pressure crash or an off-axis pressure crash. Unlike the core pressure crash, the plasma pressure at the magnetic axis remains almost unchanged during the off-axis pressure crash. The pressure crash only occurs in the annular region during the off-axis crash, and the on-axis plasma pressure slowly reduces after the crash, which is consistent with TFTR observations. A series of simulations are carried out to investigate the influence of the radial position of the inner resonant surface r1, the magnetic shear at the inner resonance surface, and the spatial separation between the two resonant surfaces on nonlinear behaviors of DTMs. We find that r1 plays a dominant role in the nonlinear DTM behaviors. It is more likely for the DTM to lead to the core pressure crash with a smaller r1. It is also found that the magnetic shear at the inner resonant surface and the spatial separation between the two resonant surfaces can also largely influence the nonlinear evolution of the DTM. A simple theoretical formula of the transition criterion between the two pressure crashes is proposed, which agrees well with the simulation results.

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Progress of HL-2A physical experiments

Abstract: Quantum twisted double-slits experiments: confirming wavefunctions' physical reality Science Bulletin 62, 1185 (2017); Recent progress on confinement of polysulfides through physical and chemical methods

Cited by 2 publications

References 16 publications

An FFT overlap method for high bandwidth far-infrared laser Interferometer in HL-2A

An FFT overlap method for high bandwidth far-infrared laser Interferometer in HL-2A

The off-axis pressure crash associated with the nonlinear evolution of the m/n = 2/1 double tearing mode

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