Development of a low emittance electron gun based on field emission cathodes

2005 International Vacuum Nanoelectronics Conference Pub Date : 2005-07-10 DOI:10.1109/IVNC.2005.1619577

R. Ganter, R. Bakker, R. Betemps, M. Dehler, T. Gerber, J. Gobrecht, C. Gough, M. Johnson, E. Kirk, G. Knopp, F. le Pimpec, K. Li, M. Paraliev, M. Pedrozzi, L. Rivkin, H. Sehr, L. Schulz, A. Wrulich

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引用次数: 1

Abstract

Field emitters are investigated for use as a low emittance electron gun. Two available field emitter technologies are currently explored; the field emitter arrays (FEAs) with individual focusing and single tip cathode with robust and fairly blunt apex. The challenge is to achieve several amperes of peak current without tip destructions. Very good cathode and environmental conditioning procedures with extremely short emission duration (ns) at low repetition rate (10 Hz) gave encouraging results to reach high peak current emission. For a free electron laser application, very short emission durations are preferred. Such operation regime should prevent the tip from overheating so that higher current densities could be reached. Another possible low emittance electron sources are single needle tips made from etched wires and which can be coated and formed in order to carry high current emission. One way to achieve short emission duration is to use pulsed laser light illuminating the tip while high electric field is applied.

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基于场发射阴极的低发射电子枪的研制

研究了场发射体作为低发射度电子枪的用途。目前正在探索两种可用的磁场发射器技术;具有单独聚焦和单端阴极的场发射极阵列(FEAs)，其尖端坚固且相当钝。挑战是要达到几安培的峰值电流而不破坏尖端。极好的阴极和环境调节程序，在低重复率(10 Hz)下极短的发射持续时间(ns)，获得了令人鼓舞的结果，达到了高峰值电流发射。对于自由电子激光的应用，非常短的发射持续时间是首选的。这样的操作制度应该防止尖端过热，从而可以达到更高的电流密度。另一种可能的低发射度电子源是由蚀刻导线制成的单针尖，它可以被涂覆和形成以携带高电流发射。利用脉冲激光在高电场作用下照射针尖是实现短发射持续时间的一种方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2005 International Vacuum Nanoelectronics Conference

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