Gu-Yue Zhou

Huazhong University of Science and Technology

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Yi Liu

Huazhong University of Science and Technology

Xiandong Li

Chongqing University

Zhiyuan Li

Mongolian University of Science and Technology

Siwei Liu

Tohoku University

Fu-Chang Lin

Huazhong University of Science and Technology

H.S. Chen

China University of Mining and Technology

Shunzhong Chen

Institute of Electrical Engineering

J. B. Liu

Lanzhou University

Weimin Wang

Wuhan University of Technology

Yuan Pan

China University of Petroleum, East China

Cooperative Institutions

Chinese Academy of Sciences

Huazhong University of Science and Technology

University of Chinese Academy of Sciences

Wuhan National Laboratory for Optoelectronics

Institute of Electrical Engineering

Ministry of Education of the People's Republic of China

Peking University

Beijing Jiaotong University

Nanjing University of Aeronautics and Astronautics

Nanjing University

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Intensity improvement of shock waves induced by liquid electrical discharges

Physics of Plasmas (2017)

Yi Liu Zhiyuan Li Xiandong Li Siwei Liu Gu-Yue Zhou

When shock waves induced by pulsed electrical discharges in dielectric liquids are widely applied in industrial fields, it is necessary to improve the energy transfer efficiency from electrical energy to mechanical energy to improve the shock wave intensity. In order to investigate the effect of the plasma channel length created by the liquid electrical discharge on the shock wave intensity, a test stand of dielectric liquid pulsed electrical discharge is designed and constructed. The main capacitor is 3 μF, and the charging voltage is 0–30 kV. Based on the needle-needle electrode geometry with different gap distances, the intensities of shock waves corresponding to the electrical parameters, the relationship between the plasma channel length and the deposited energy, and the time-resolved observation of the plasma channel development by a high speed camera are presented and compared. The shock wave intensity is closely related to the power and energy dissipated into the plasma channel. The longer plasma channel and the quicker arc expansion can lead to a higher power and energy deposited into the plasma channel, which can activate a stronger shock wave.

Plasma channel

Intensity

Pulsed Power

Electric potential energy

Electric shock

10.1063/1.4980848

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Passive shimming of a 3T cryogen-free animal magnetic resonance imaging superconducting magnet with dense shim tray slots and small residual magnetic force

Review of Scientific Instruments (2024)

Pengfei Wu Yaohui Wang Wenchen Wang Weimin Wang J. B. Liu

Passive shimming is widely used in magnetic resonance imaging (MRI) systems due to its excellent efficacy and cost-effectiveness. However, conventional shim tray structures have difficulty in effectively adjusting magnetic field distributions under specific conditions. This limitation can lead to insufficient cancellation of harmonics and result in significant residual forces on the trays, impeding accurate placement of the trays. In this study, instead of using the conventional design of the shim tray slot, we propose a dedicated passive shimming tray tailored for 3T cryogen-free animal MRI superconducting magnets. Passive shimming experiments were conducted to evaluate the performance of this novel design, in which we were able to improve the peak-to-peak magnetic field homogeneity within the 180 mm diameter imaging region, reducing peak-to-peak (p–p) variation from 349.35 ppm to 19.08 ppm. Furthermore, the p–p homogeneity of the magnetic field measured at the imaging area with a diameter of spherical volume (DSV) of 160 mm reached 8.67 ppm. In addition, we strictly controlled the residual magnetic force of the shim tray to ensure its accurate placement. The experimental results indicate that the proposed structural optimization method and the residual magnetic force control strategy show potential in high-field MRI instruments requiring high homogeneity and handling of high residual magnetic force.

Shim (computing)

Tray

10.1063/5.0215247

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Influence of deposited energy on shock wave induced by underwater pulsed current discharge

Physics of Plasmas (2016)

Xiandong Li Yi Liu Siwei Liu Zhiyuan Li Gu-Yue Zhou

In this paper, an integrated experimental system is established to study the influence of deposited energy on the intensity of the shock wave induced by underwater pulse discharge. Considering the time varying behavior of the arc, the calculation methods of the deposited energy into the plasma channel and the average arc resistance are proposed and presented. The effect of the breakdown process on the deposited energy and the shock wave is analyzed. It can be concluded that the shock wave intensity can be improved by depositing more energy in the first half oscillation period and increasing the arc resistance. It is also found that the energy deposition and the shock wave intensity are significantly influenced by the breakdown time delay and the shape of the initial plasma channel.

Intensity

Plasma channel

Electric arc

Oscillation (cell signaling)

Deposition

10.1063/1.4964663

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Citations (28)