Generation of zepto-second scale hard X-ray pulses by Peta-Watt laser

In this report, we investigate the feasibility of generating multi-KeV photon pulses of several hundred zepto-seconds (zs) duration via all-optical setup, where PW laser produces multi GeV electron bunches, which create hard X-ray zs pulses in propagation through standard undulator/wiggler. We found the interaction regime when effective production of ultrashort (zs) hard X-ray pulses is possible, even though using a much longer driving laser pulse and electron bunch, with help of analytical modelling and numerical simulations by EPOCH and PUFFIN codes.