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• High Power Laser Science and Engineering
• Vol. 8, Issue 4, 04000e38 (2020)
Obulkasim Olugh1、2, Zi-Liang Li3, and Bai-Song Xie1、4、*
Author Affiliations
• 1Key Laboratory of Beam Technology of the Ministry of Education, and College of Nuclear Science and Technology, Beijing Normal University, Beijing100875, China
• 2Xinjiang Police College, Urumqi830011, China
• 3School of Science, China University of Mining and Technology, Beijing100083, China
• 4Beijing Radiation Center, Beijing100875, China
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Fig. 1. Momentum spectra of produced pairs for linear polarization () at in the plane when the rising pulse length is fixed but the falling pulse length becomes shorter with . The chosen parameters are , and , where is the electron mass.
Fig. 2. Same as Figure1 except that the falling pulse length becomes longer with .
Fig. 3. Same as Figure1 except for elliptic polarization, .
Fig. 4. Same as Figure2 except for elliptic polarization, .
Fig. 5. Same as Figure1 except for circular polarization, .
Fig. 6. Same as Figure 2 except for circular polarization, .
Fig. 7. The number density (in units of ) of pairs produced in differently polarized electric fields for the shorter falling length of the asymmetric pulse shape with . The field parameters are the same as in Figure 1. Here LP, EP and CP with squares, circles and triangles denote the linear , elliptical and circular cases, respectively.
Fig. 8. Same as Figure 7 except for the elongated falling case with .
${f}_{\mathrm{max}}\left(\mathbf{q},\infty \right)$ at peak
$k=1$ $k=0.1$ $k=10$
$\delta =0$ $29.40\times {10}^{-6}$ $8.28\times {10}^{-4}$ $5.24\times {10}^{-5}$
$\delta =0.5$ $9.65\times {10}^{-6}$ $7.50\times {10}^{-4}$ $6.36\times {10}^{-5}$
$\delta =1$ $2.36\times {10}^{-6}$ $6.46\times {10}^{-4}$ $6.38\times {10}^{-5}$
Table 1. The peak values of the particle distribution function for the typical polarization when the rising pulse length is fixed and the falling pulse length is short and/or elongated. Note that these peaks occur at different values of the momentum .