Ultraintense laser–plasma experiments generate a variety of high-energy radiations,including nonlinear inverse Compton scattered(NCS)X-rays,which are expected to be a key experimental observable as we transition into...Ultraintense laser–plasma experiments generate a variety of high-energy radiations,including nonlinear inverse Compton scattered(NCS)X-rays,which are expected to be a key experimental observable as we transition into the quantum electrodynamic plasma regime.However,there is also a high bremsstrahlung X-ray background that reduces our ability to observe NCS X-rays.Previous numerical studies comparing NCS and bremsstrahlung emissions fail to capture the full temporal emission of both processes.We present for the first time two-dimensional particle-in-cell(PIC)and three-dimensional hybrid-PIC EPOCH simulations that capture up to 150 ps of the laser–plasma interaction and directly compare the NCS and bremsstrahlung emissions for a plastic target for intensities of 10^(20)-10^(23)W/cm^(2).We present angular distribution plots where the NCS emission is seen to dominate at intensities greater than 5×10^(21)W/cm^(2)and the target design is seen to successfully divert the bremsstrahlung signal away from the NCS lobe regions,making the experimental observation of nonlinear inverse Compton scattering at lower intensities more likely.展开更多
基金the Science and Technology Facilities Council and the Engineering and Physical Sciences Research Council for their funding towards this project,and the continued support of research into QED laser–plasma physicsfunding fromthe Engineering and Physical Sciences Research Council[EP/S022430/1]。
文摘Ultraintense laser–plasma experiments generate a variety of high-energy radiations,including nonlinear inverse Compton scattered(NCS)X-rays,which are expected to be a key experimental observable as we transition into the quantum electrodynamic plasma regime.However,there is also a high bremsstrahlung X-ray background that reduces our ability to observe NCS X-rays.Previous numerical studies comparing NCS and bremsstrahlung emissions fail to capture the full temporal emission of both processes.We present for the first time two-dimensional particle-in-cell(PIC)and three-dimensional hybrid-PIC EPOCH simulations that capture up to 150 ps of the laser–plasma interaction and directly compare the NCS and bremsstrahlung emissions for a plastic target for intensities of 10^(20)-10^(23)W/cm^(2).We present angular distribution plots where the NCS emission is seen to dominate at intensities greater than 5×10^(21)W/cm^(2)and the target design is seen to successfully divert the bremsstrahlung signal away from the NCS lobe regions,making the experimental observation of nonlinear inverse Compton scattering at lower intensities more likely.
