Coaxial structure pulsed intense magnetic field device for laser plasma experiments

Wang Zhi; Wang Jincan; Li Tianyi; Xiong Chao; Tang Huibo; Kuang Longyu; Hu Guangyue

doi:10.11884/HPLPB202638.250079

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Wang Zhi, Wang Jincan, Li Tianyi, et al. Coaxial structure pulsed intense magnetic field device for laser plasma experiments[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250079

Citation:

Wang Zhi, Wang Jincan, Li Tianyi, et al. Coaxial structure pulsed intense magnetic field device for laser plasma experiments[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250079

Wang Zhi, Wang Jincan, Li Tianyi, et al. Coaxial structure pulsed intense magnetic field device for laser plasma experiments[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250079

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Coaxial structure pulsed intense magnetic field device for laser plasma experiments

doi: 10.11884/HPLPB202638.250079

Wang Zhi^1
,,
Wang Jincan¹,
Li Tianyi¹,
Xiong Chao¹,
Tang Huibo^{1
,
,},
Kuang Longyu^{2
,
,},
Hu Guangyue^{1, 3
,
,}

1.
Key Laboratory of Geospace Environment of Chinese Academy of Sciences, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
2.
Laser Fusion Research Center, CAEP, Mianyang 621900, China
3.
Center for Excellence in Ultra-intense Laser Science (CEULS), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 200031, China

Received Date: 2025-08-24
Accepted Date: 2025-12-23
Rev Recd Date: 2026-01-12

Available Online: 2026-01-28

Abstract

Abstract

Background
In recent years, magnetized laser-plasma research has gained significant importance in multiple frontier fields such as magneto-inertial confinement fusion, magnetic reconnection, collisionless shocks, and magnetohydrodynamic instabilities. Pulsed magnetic field devices have become the mainstream experimental approach, as they can generate magnetic field parameters that meet experimental requirements in terms of strength, spatial scale, and duration. Such devices have been integrated into multiple large-scale laser facilities worldwide, and our research group has also successfully developed several pulsed magnetic field systems adaptable to laser setups of different scales. However, existing devices still face two major challenges: first, strong electromagnetic interference affects data acquisition and equipment safety; second, advances in physical experiments demand higher magnetic field strengths.
Purpose
This study presents a novel coaxial-structure pulsed magnetic field device, designed to optimize the circuit configuration for suppressing electromagnetic interference (EMI) and enhancing magnetic field strength, thereby providing a more reliable high-field environment for magnetized laser-plasma experiments.
Methods
The experiment employs an all-coaxial architecture to enhance electromagnetic compatibility. Multiple soft coaxial cables are connected in parallel to link a 5 μF high-voltage coaxial capacitor with a rigid coaxial transmission line inside the vacuum target chamber, thereby minimizing system inductance.
Results
At 40 kV charging voltage, a discharge current with 105 kA peak intensity, a rise time of 1.2 μs, and a flat top width of 1.4 μs is produced, which generates a intense magnetic field of 22 T in the center of a three-turn magnetic field coil with 12 mm diameter. Compared with our previous pulsed intense magnetic field device, the present device can generate larger current and stronger magnetic field, while the free-space EM noise and potential jitter (voltage fluctuation) of the vacuum chamber are significantly reduced.
Conclusions
Experimental results demonstrate that the key performance of this device has reached the mainstream advanced level of international counterparts, such as relevant systems from the U.S. LLNL, France's LULI, and Germany’s HZDR. This device combines high magnetic field strength, microsecond-level flat-top stability, and low electromagnetic interference, providing precisely controllable strong magnetic field experimental conditions—previously difficult to achieve—for frontier research areas such as magneto-inertial confinement fusion, laboratory astrophysics, magnetohydrodynamic instabilities, and pulsed laser deposition coating.
- magnetized laser plasma,
- pulse power technology,
- pulsed magnetic field,
- electromagnetic noise

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References(31)

References

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