Femtosecond precision measurement of laser-rf phase jitter in a photocathode rf gun

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• 作者：Libing Shi ; Lingrong Zhao ; Chao Lu ; Tao Jiang ; Shengguang Liu ; Rui Wang ; Pengfei Zhu ; Dao Xiang ; ^{dxiang@sjtu.edu.cn}
• 关键词：Ultrafast electron diffraction ; Laser and rf synchronization ; Temporal resolution ; Laser-to-rf phase jitter
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：21 March 2017
• 年：2017
• 卷：849
• 期：Complete
• 页码：1-4
• 全文大小：652 K
• 卷排序：849

文摘

We report on the measurement of the laser–rf phase jitter in a photocathode rf gun with femtosecond precision. In this experiment four laser pulses with equal separation are used to produce electron bunch trains; then the laser–rf phase jitter is obtained by measuring the variations of the electron bunch spacing with an rf deflector. Furthermore, we show that when the gun and the deflector are powered by the same rf source, it is possible to obtain the laser–rf phase jitter in the gun through measurement of the beam–rf phase jitter in the deflector. Based on these measurements, we propose an effective time-stamping method that may be applied in MeV ultrafast electron diffraction facilities to enhance the temporal resolution.