A high-DC-voltage GaAs photoemission gun: Transverse emittance and momentum spread measurements

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167) Pub Date : 1997-05-12 DOI:10.1109/PAC.1997.752734

D. Engwall, C. Bohn, L. Cardman, B. Dunham, D. Kehne, R. Legg, H. Liu, M. Shinn., C. Sinclair

引用次数: 17

Abstract

We have built a high-DC-voltage photoemission gun and a diagnostic beamline permitting us to measure rms transverse emittance (/spl epsi//spl tilde//sub x/) and rms momentum spread (/spl delta/) of short-duration electron pulses produced by illuminating the cathode with light from a mode-locked, frequency-doubled Nd:YLF laser. The electron gun is a GaAs photocathode source designed to operate at 500 kV. We have measured /spl epsi//spl tilde//sub x/ and /spl delta/ for conditions ranging from emittance-dominated to space-charge-dominated. We report these measurements as functions of microbunch charge for different beam radii, pulse lengths, and voltages/field gradients at the cathode, and compare them with PARMELA calculations.

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高直流电压砷化镓光发射枪:横向发射度和动量扩散测量

我们已经建立了一个高直流电压光电发射枪和一个诊断光束线，使我们能够测量由锁模、倍频Nd:YLF激光照射阴极产生的短时间电子脉冲的rms横向发射度(/spl epsi//spl波浪//sub x/)和rms动量扩散(/spl delta/)。电子枪是一个设计工作在500千伏的砷化镓光电阴极源。我们已经测量了/spl epsi//spl波浪// subx /和/spl delta/从发射主导到空间电荷主导的条件。我们报告了这些测量结果作为不同光束半径、脉冲长度和阴极电压/场梯度下微束电荷的函数，并将其与PARMELA计算结果进行了比较。

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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来源期刊

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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