Simulation Study of Positron Beam Generation via Irradiating an Ultra-Intense Laser on a Hollow Target

Abstract:

By simulation with the relativistic PIC code EPOCH, it is found that a hollow target ismore beneficial than a plane one for the collimation and compression of the positrons. Irradiating anultra-intense laser (4×10²³ W/cm²) on a hollow target, 8.74×10¹⁵ positrons are generated. Due tothe focusing effect of the transverse electric field formed in the hollow wall, the divergence angle isaround 21° , while the maximum density of the beam is 4.77×10²¹ cm^-3. When the laser intensity is doubled, both the yield (5.31 ×10¹⁶) and the maximum density (1.57 ×10²² cm^-3) are greatly increased while the beam divergence gets even smaller (15.7 °).

• Periodical: Defect and Diffusion Forum (Volume 373)
• Pages: 53-56
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.373.53
• Online since: March 2017
• Authors: Jian Xun Liu, Yan Yun Ma*, Jun Zhao, Tong Pu Yu, Xiao Hu Yang, Wei Quan Wang, Jing Jiang
• Keywords: Collimated, Hollow Target, Laser, Positron

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