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TUSBC1 |
Simulating Radiation from Laser-wakefield Accelerators | |
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Radiation from laser-wakefield accelerators (LWFA), ranging from the x-ray to the infrared spectrum, is of great interest for experiments, both for advanced diagnostics and radiation sources. Hence, detailed numerical modelling of these phenomena is desired for understanding measured data. In order to meet computational demands, we build on recent advances in general purpose graphical processing units (GPGPU). With the PIConGPU code, a scalable, highly-parallel, performant implementation of a 3D-PIC code [1], it is possible to run large-scale, realistic simulations within hours compared to more than a week on CPUs. Here we present, a Liénard-Wiechert-type radiation algorithm (CLARA) as an extension to PIConGPU, which now can calculate the plasma radiation spectrum in all directions of the solid angle, parallel to the laser-plasma simulation, when the full macro-particle data is in memory. We discuss the algorithm with its trade-offs between data storage and computation time on GPUs and CPUs. As examples, we display first results from realistic laser-wakefield accelerator scenarios investigated using the DRACO laser system at the HZDR.
[1] H Burau, et al, "PIConGPU: A Fully Relativistic Particle-in-Cell Code for a GPU Cluster", IEEE Transactions on Plasma Science 38(10), 2831-2839 (October 2010) |
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Slides TUSBC1 [10.019 MB] | |