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首页> 外文期刊>Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures >Pulsed field emitted current from different commercial samples in the purpose of a free electron laser application
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Pulsed field emitted current from different commercial samples in the purpose of a free electron laser application

机译：在自由电子激光应用中，来自不同商业样品的脉冲场发射电流

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摘要

The development of an electron gun with the lowest possible emittance would help reduce the total length and cost of a free electron laser. Recent progress in vacuum microelectronics makes field emitter tips an attractive technology to explore for high brightness electron sources. In order to be a good candidate for a low emittance gun, field emission cathodes must provide at least the peak current, stability, and homogeneity of current state of the art electron sources. In this article, we report on current voltage measurements of commercially available field emitter samples in both continuous and pulsed mode. Pulsed electron emission is of particular interest for a free electron laser application. As mentioned by other authors [F. Charbonnier, Appl. Surf. Sci. 94/95, 26 (1996); P. R. Schwoebol et al., J. Vac. Sci. Technol B 19, 980 (2001)], higher peak current and more stable emission can be achieved when using short square voltage pulses at low frequency. We present maximum peak currents achieved with 100 ns long voltage pulses at low frequency (50 Hz). In such a pulsed mode, the risk of excessive heating and cathode damaging is considerably reduced.
机译：开发具有尽可能低的发射率的电子枪将有助于减少自由电子激光器的总长度和成本。真空微电子学的最新进展使场发射器尖端成为探索高亮度电子源的一项有吸引力的技术。为了成为低发射率电子枪的良好候选者，场发射阴极必须至少提供现有电子源电流状态的峰值电流，稳定性和均质性。在本文中，我们报告了在连续和脉冲模式下市售场发射器样品的当前电压测量结果。对于自由电子激光应用，脉冲电子发射特别重要。正如其他作者所提到的[F. Charbonnier，Appl。冲浪。科学94/95，26（1996）; P.R.Schwoebol等人，J.Vac。科学Technol B 19，980（2001）]，当在低频下使用短平方电压脉冲时，可以实现更高的峰值电流和更稳定的发射。我们介绍了在低频（50 Hz）下使用100 ns长的电压脉冲可获得的最大峰值电流。在这种脉冲模式下，显着降低了过度加热和阴极损坏的风险。

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