Topic/Type: 1.3 High intensity Laser Plasma Interaction, Poster

### Full radiation calculations based on PIC particle tracking

J.L. Martins1, S.F. Martins1, R.A. Fonseca1, 2, L. O. Silva1

1 GoLP / Instituto de Plasmas e Fus?o Nuclear - Instituto Superior T?cnico, Lisbon, Portugal
2 DCTI/ISCTE, Lisbon, Portugal

In extreme plasma physics scenarios the wavelength of the radiation emitted by accelerated charged particles is much shorter than the other spatial scales involved. For instance, in laser-plasma accelerator schemes in the blowout regime the wavelength of the radiation emitted by the electrons oscillating in the bubble/blow-out region can reach the nm to Ansgtrom scale, while the laser and plasma wavelength are of the order of the hundreds of nm and tens to hundreds of microns (for densities in the range of $\small 10^{16} - 10^{18} \mathrm{cm^{-3}}$ respectively.? Resolving the wavelength of the radiation directly in 3D PIC simulations in these cases can be prohibitive in terms of memory requirements due to the disparity of the length scales.

To address this issue, one of the techniques that can be employed is the calculation of the radiation features from the particle trajectories in phase space.
We have developed a massively parallel code that takes the track information data mined from PIC simulations and determines both the energy and the spectrum of the radiation emitted by the selected particles.?
This method allows the calculation of the radiation spectrum well beyond the PIC resolution.?In this work we describe the numerical methods employed to determine the radiation features. We present benchmark examples from synchrotron and betatron (in the undulator and wiggler regime) and compare the results with theory. We detail the time, spatial and spectral resolution requirements and the features of the diagnostic, such as time-resolved radiated energy. We present results of the radiation of self-injected electrons in the blow-out regime for parameters to be available in the next generation of laser systems such as ELI.