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The 17th International Conference on High-Power Particle Beams

作者： Chen Changhua Liu Guozhi Huang Wenhua Shao Hao Sun Jun Xiao Renzhen Zhang Xiaowei Zhang Yuchuan Northwest Institute of Nuclear Technology P.O.Box 69-13 Xi’an 710024 China

＜正＞Advances of repetitively operated relativistic backward wave oscillator （BWOs） is *** of operating stability of BWO was obtained based on our earlier BWO operating at 100 Hz repetitive rates through changing the cathode and beam *** oil- immersed graphite cathode and water-cooled beam collector were introduced to increase output stability. Experimental results indicate that BWO’s efficiency is up to the highest 33 % at optimum diode voltage,which is consistent with numerical *** BWO could stably operate at rates of 100 Hz with microwave output power of over 1 GW,and the continuous time was up to 5 seconds.

关键词： HPM backward wave oscillator repetitive rate

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Experimental Study of the Recovery Times of Spark Gap Switch with Different Gases

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Plasma Science and Technology 2008年第3期10卷 379-382页

作者：殷毅刘金亮钟辉煌冯加怀 College of Optoelectric Science and Engineering National University of Defense Technology Changsha 410073 China

A two-pulse method is used to determine the insulation recovery time of the gas spark gap switch with different types of gas applied in a high power accelerator with a water dielectric pulse forming line. At the breakdown voltage of 450 kV, with the vacuum diode voltage of about 200 kV, and a current of 30 kA, recovery characteristics of H2, N2, SF6 were studied. The recovery percentages of the gas breakdown voltage and vacuum diode voltage were determined. The results show that hydrogen has the best recovery characteristics. At a pulse interval of 8.8 ms, the recovery percentages of both the gas breakdown voltage and vacuum diode voltage for hydrogen exceed 95%. For SF6 and N2 with an interval of 25 ms and 50 ms respectively, a 90% voltage recovery was obtained. The experiments also proved that the repetitive rate of the high power accelerator with a pulse forming line is mainly restricted by the gas switch repetitive rate; the recovery percentages of the vacuum diode voltage are limited by the recovery percentages of the gas switch breakdown voltage. The hydrogen switch can be employed for a high repetitive rate-high power accelerator with a pulse forming line.

关键词： high current electron accelerator hydrogen switch gas recovery repetitive rate

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