LaB6在低压强氮气和氦气中的放电特性
Discharge performance of LaB6 cathode in helium and nitrogen of low pressure
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摘要: 研究了LaB6在1~10 Pa氮气和氦气中的直流和脉冲放电特性以及放电过程对电极的影响。结果表明，电极直径为5 mm的LaB6氦气放电管在脉冲工作状态下可以长期稳定放电。在脉冲电压为2.2 kV、脉冲宽度10 ms、频率13.3 Hz下，脉冲峰值放电电流超过120 A。氦气放电管在放电过程中，阴极表面有离子的清洗和活化作用，可以使电极的表面逸出功降低，提高放电管的发射能力和稳定性。LaB6作为气体放电电极具有寿命长、延迟时间短、放电电流大等优点，可用于重复强流脉冲气体放电的高压高速开关器件。Abstract: Gas discharge performance of LaB6 in helium and nitrogen is reported. The results show that as the voltage rises, the discharge mechanism changes from glow discharge into arc discharge, the helium discharge tube can work long time and steadily under impulses. The peak value of discharge current is more than 120 A when the pulse voltage is 2.2 kV, the pulse width is 10 ms, frequency is 13.3 Hz. In the discharging process, the ions can clean and activate the surfaces of the cathodes, which can reduce the work function of the cathodes, improve the discharge tubes’ emission capability and stability. As electrode, LaB6 has the advantages of long lifetime, short breakdown time delay, great current, etc., so it is suitable to be applied in repetitive pulsed gas discharge components with large cu
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Key words:
- lab6 /
- gas discharge /
- helium diode /
- high voltage pulse switch
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