强激光与粒子束2024，Vol.36Issue(10)：69-81,13.DOI:10.11884/HPLPB202436.240136
激光等离子体实验中脉冲强磁场设备产生的电磁干扰和屏蔽方法
Generation and mitigation of electromagnetic pulses from pulsed intense magnetic field device in laser plasma experiments
摘要
Abstract
Pulsed intense magnetic fields play an important role in the field of high power laser material interaction,while the electromagnetic pulse generated by pulsed intense magnetic field devices will disturb the signal measurement in laser plasma experiment.We measured the spatial distribution and spectral characteristics of electromagnetic pulse using Rogowski coils,high-voltage probes,antennas,and sampling resistors on the laser plasma experimental platform.It is found that the electromagnetic pulses come from the main discharge circuit of the pulsed intense magnetic field device,and the secondary circuit of charging and grounding.The electromagnetic pulses transform onto the vacuum target chamber through capacitive coupling between the transmission line and the flange on the vacuum target chamber that places the transmission line,and then enter the electronic devices through conductive coupling pathways,or enter the power grid or weak current cables through charging lines and grounding wires,and finally enter the electronic devices.Part of the free space electromagnetic pulse is directly coupled into cables and electronic devices.We depress the electromagnetic noise that enters the detector by disconnecting the conductive coupling path and shielding free space electromagnetic pulse.Experiments showed that the measured electromagnetic pulse amplitude,especially at the 0.14 MHz discharge main frequency component,was well suppressed,by physically disconnecting the electrical connection between the power grid and electronic equipment.Isolating the high-voltage power supply from the low-voltage grounding connection can decrease the electromagnetic noise markedly.Shielding shell and shielding cabinet that cover the electronic devices are available approaches to depress the free space and conductive coupled electromagnetic noise.关键词
激光等离子体/脉冲强磁场设备/电磁干扰/电磁屏蔽Key words
laser plasma/pulsed intense magnetic field device/electromagnetic pulse/electromagnetic shielding分类
信息技术与安全科学引用本文复制引用
王金灿,张振弛,王志,唐桧波,况龙钰,胡广月..激光等离子体实验中脉冲强磁场设备产生的电磁干扰和屏蔽方法[J].强激光与粒子束,2024,36(10):69-81,13.基金项目
国家自然科学基金项目(12175230,11775223,12205298) （12175230,11775223,12205298）
中国科学院战略先导专项项目(XDB16) （XDB16）
