Pseudospark-sourced electron beam for millimeter wave and terahertz radiation generation
Pseudospark-sourced electron beam for millimeter wave and terahertz radiation generation
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用于产生毫米波和太赫兹辐射的赝火花源电子束
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Phelps
中科院分区：
文献类型：
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作者：
A. Cross;H. Yin;D. Bowes;Wenlong He;K. Ronald;A. Phelps
研究了多间隙和小尺度单间隙赝火花放电中电子束的产生和传输。从一个三间隙的赝火花，一个光束高达680 A的测量在阳极在所施加的直流电压为23千伏。该电子束可以在没有引导磁场的气体环境中向下游传播远至20 cm，这证实了电子束的传输是基于由于电子束本身电离气体分子而导致的电子束的空间电荷的中和。该光束直径为1-3 mm，非常小，非常适合驱动高频辐射。更高的能量的电子束脉冲产生使用14间隙pseudospark放电供电的电缆脉冲发生器能够产生120 ns的持续时间和170 kV的电压脉冲。测量的光束电流高达110 A。利用产生的光束模拟和实验研究了Ka波段切伦科夫脉塞和W波段返波振荡器。两种器械均成功检测到毫米波脉冲。为了研究赝火花放电尺寸的减小对电子束性能的影响，进行了单间隙1 mm口径赝火花电子束实验，并在此基础上设计和模拟了206 GHz微速调管。
The production and propagation of an electron beam from both a multi-gap and a small-scale single-gap pseudospark discharge are investigated. From a three-gap pseudospark, a beam up to 680 A was measured at the anode at an applied dc voltage of 23 kV. This beam can propagate downstream as far as 20 cm in a gaseous environment with no guiding magnetic field, which confirms that the transport of the electron beam was based on the neutralization of the space-charge of the electron beam due to the ionization of the gas molecules by the beam itself. The beam is of very small size of 1-3 mm in diameter and is ideal to drive high frequency radiation. Higher energy electron beam pulses were generated using a 14-gap pseudospark discharge powered by a cable pulser capable of producing 120 ns duration and 170 kV voltage pulses. The beam measured had a current of up to 110 A. A Ka-band Cherenkov maser and a W-band backward wave oscillator from the produced beam were simulated and experimentally studied. Millimeter wave pulses were detected successfully from both devices. In an effort to show the effects of scaling down the size of the pseudospark discharge on beam performance, a single-gap 1mm aperture pseudospark electron beam experiment was conducted, based on which a 206 GHz microklystron was designed and simulated.