First principles modeling of radiation from Weibel turbulence

The Weibel (filamentation) instability occurs in weakly-magnetized or unmagnetized plasmas with an anisotropic particle distribution function. It is typical of high-energy-density environments like laser-produced and astrophysical plasmas, such as in collisionless shocks of gamma-ray bursts and supernovae, accretion shocks in galaxy clusters and others. Radiation from the Weibel-generated small-scale fields, known as the jitter radiation, differs markedly from the cyclotron/synchrotron radiation and carries wealth of information about the magnetic field properties, as both theoretical and numerical studies predict. Our goal is to study such radiation from the first principles using the state-of-the-art PIC simulations. Here we discuss the techniques and first tentative results of the project.