Femtosecond electron pulse compression by using the time focusing technique in ultrafast electron diffraction |
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Authors: | Wen Wen-Long Lei Xiao-Hong Hu Xin Xu Xiang-Yan Wang Jun-Feng Cao Xi-Bin Liu Hu-Lin Wang Chao Dang Li-Hong and Tian Jin-Shou |
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Institution: | State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; Research Centre of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China; Xi'an Communications Institution, Xi'an 710106, China |
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Abstract: | We present a new model of an electron gun for generating subrelativistic femtosecond (fs) electron pulses. The basic idea is to utilize a dc acceleration stage combined with a time focusing region, the time focusing electrode generates an electron energy chirp for bunching at the target. Without considering the space charge effects, simulations of the electron gun were carried out under the conditions of different dc voltages and various slopes of the voltage added on the time focusing electrode. Tracing and simulating large numbers of photoelectrons through Monte-Carlo and finite difference methods, the electron pulses with 1 ps can be compressed to 55 fs, which will allow significant advances in the field of ultrafast diagnosis. |
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Keywords: | time focusing technique temporal pulse compressing time-dependent electric field Monte-Carlo method |
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