Abstract
A novel technique of symmetric type quasi-linear electron pulse duration modulation is proposed. The salient feature from the conventional photoelectron gun is the introduction of the alternating electric field resonator. The electric field that results is synchronously controlled to generate the desired quasi-linear differential energy modulation on the electron pulse passing through. The effect resulted directly is that the leading electrons undergo negative energy modulation and decelerate, while the rear ones positive energy modulation and accelerate, which eventually leads to electron-pulse-duration modulation. The technical details are demonstrated.
Highlights
Electron-optical methods based on ultrafast manipulation of ultra-short electron pulse have become firmly established as the most advanced in the area of time-resolved events recording and investigation [1]-[12]
The effect resulted directly is that the leading electrons undergo negative energy modulation and decelerate, while the rear ones positive energy modulation and accelerate, which eventually leads to electron-pulse-duration modulation
There still remains a big technological challenge in improving time-resolved performance of both Ultrafast electron diffraction (UED) and streak camera. For the former, temporal broadening of electron pulse induced by both space charge effect and its initial energy spread prevents obtaining high-brightness electron pulses with sub-100 fs durations, limiting the range of phenomena that can be studied with this technique
Summary
Electron-optical methods based on ultrafast manipulation of ultra-short electron pulse have become firmly established as the most advanced in the area of time-resolved events recording and investigation [1]-[12]. There still remains a big technological challenge in improving time-resolved performance of both UED and streak camera. For the former, temporal broadening of electron pulse induced by both space charge effect and its initial energy spread prevents obtaining high-brightness electron pulses with sub-100 fs durations, limiting the range of phenomena that can be studied with this technique. In this contribution, we propose the method of symmetric type quasi-linear electron pulse duration modulation.
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