Effects of pulse profile on electron-positron pair creation

被引：5
|
作者：
Zhou, X. X. [1 ]
Li, C. K. [1 ]
Jiang, M. [2 ]
Lin, N. S. [2 ]
Li, Y. J. [1 ,2 ]
机构：
[1] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China
[2] China Univ Min & Technol, Dept Physc, Beijing 100083, Peoples R China
来源：
EPL | 2019年 / 128卷 / 01期
基金：
中国国家自然科学基金;
关键词：
VACUUM; FIELD;
D O I：
10.1209/0295-5075/128/10001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the effects of the pulse profiles on electron-positron pair creation. Three localized time-dependent pulses, i.e., Sauter pulse, Gaussian pulse and cosine pulse, are studied through several proposals. The non-monochromatic pulse (Sauter or Gaussian pulse) creates more pairs than the monochromatic pulse (cosine pulse). To investigate the creation process, the relationship between the maximum pair number and the final pair number (which is called retracement) is analysed. The results show that the Gaussian pulse gives the smallest re-annihilation rate because the annihilation mostly happen in the high-energy region where less pairs are created, while the low-energy pairs mostly annihilate in the cosine case. The optimal pulse profiles, which maximize the total pair creation number, are found in three cases. Furthermore, an additional static field enhances the pair creation for all pusles. The optimal field parameters of the combination fields are calculated out. Copyright (C) EPLA, 2019
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页数：7
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