http://arxiv.org/abs/2111.00563
Understanding and interpretation of the dynamics of ultrarelativistic plasma is a challenge, which calls for the development of methods for in situ probing the plasma dynamical characteristics. We put forward a new probing method, harnessing polarization properties of $\gamma$-photons spontaneously emitted from a non-prepolarized plasma irradiated by a circularly polarized strong laser pulse. We show that the temporal and angular pattern of $\gamma$-photon linear polarization is explicitly correlated with the instantaneous dynamics of the radiating electrons, which provides information on the laser-plasma interaction regime. Furthermore, with the $\gamma$-photon circular polarization originated from the electron radiative spin-flips, the plasma susceptibility to quantum electrodynamical processes is gauged. Our study demonstrates that the polarization signal of emitted $\gamma$-photons from ultrarelativistic plasma can be a versatile information source, which would be beneficial for the research fields of laser-driven plasma, accelerator science, and laboratory astrophysics.
Z. Gong, K. Hatsagortsyan and C. Keitel
Tue, 2 Nov 21
7/93
Comments: N/A