Threshold Laser Intensity Refinement and Scenarios for Observation of QED Cascade Production

24th International Laser Physics Workshop

Fedotov, Alexander^1 ; Narozhny, Nikolay^1 ; Mironov, Arseny^1

National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh. 31, Moscow

115409, Russia^1

关键词: Experimental scheme;    Focal regions;    Laser induced;    Non trivial problems;    Qualitative estimates;    Seed particle;    Threshold intensity;    Threshold lasers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/691/1/012023/pdf
DOI  :  10.1088/1742-6596/691/1/012023

来源: IOP

【 摘 要 】

Previously we have proposed simple qualitative estimates for threshold laser intensity required to observe the laser-induced self-sustained QED (or A-type) cascades. They were later brilliantly confirmed by simulation of cascades arising in a rotating purely electric field. However, in view of numerous simulations performed since then for a more realistic setup our previous criterium of arising of self-sustained cascades may now seem to be too conservative thus essentially overestimating the intensity actually required. After refining our estimates and explaining the origin of assumptions and discrepancies with some new simulation results, we present and discuss in details two particular experimental schemes for their observation. These schemes in different ways overcome a non-trivial problem of injection of seed particles into the focal region and are optimized to lower the threshold intensity value as much as possible.