Abstract
Electron radiation and γ photon annihilation are two of the major processes in ultra intense lasers (UIL). Understanding their behavior in one coherence interval (CI) is the basis for UIL-matter interaction researches. However, most existing analytic formulae only give the average over many CIs. Present understanding of these two multi-photon processes in one CI usually assume that they emit forward and their spectra have a cutoff at the energy of the electron/γ. Such assumptions ignore the effects of involved laser photons (EILP). We deduced the formulae for these two processes in one CI with EILP included and give the conditions for the EILP to be significant. Strong EILP introduces new behaviors into these two processes in one CI, such as large angle emission and emit particles above the usually assumed cutoff. Simulations show that the EILP would be significant when laser intensity reaches 2 × 1022 W/cm2, which is within the reach of state-of-art lasers.
Highlights
At such intensity, laser-matter interaction enters a new regime where two multi-photon SFQED processes, the quantum process of electron radiation
Short coherence interval (CI) means NCS and NBW happen in different CIs are independent from each other
Due to short CI, strong secondary interactions and strong back reactions, the influence of NCS and NBW on ultra intense lasers (UIL)-matter interactions usually have to be investigated with simulations rather than analytic methods
Summary
Bo Zhang[1,2], Zhi-meng Zhang[1,2], Zhi-gang Deng[1], Wei Hong[1,2], Jian Teng[1,2], Shu-kai He1, Wei-min Zhou1,2 & Yu-qiu Gu1,2. Present UIL-matter interaction researches usually assume the γ photon emitted by NCS in one CI is along the instantaneous electron forward direction. The basis for this assumption on such a quantum process is that the emission angle of an ultra relativistic charge ~1/γ according to classical electrodynamics is very small[8,12,13]. The spectrum gets a two-stage structure and the blue shifted part can surpass the instantaneous electron energy of p0 = 1 GeV, which is the cutoff in present model of single NCS in UILs. EILP has similar influences on NBW in one CI.
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