نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه فیزیک و فوتونیک، دانشگاه ملایر، صندوق پستی: 84621-65741، ملایر- ایران
2 پژوهشکده پلاسما و گداخت هستهای، پژوهشگاه علوم و فنون هستهای، سازمان انرژی اتمی ایران، صندوق پستی: 51113-14399، تهران- ایران
کلیدواژهها
عنوان مقاله English
نویسندگان English
This paper investigates the interaction mechanism of a single collective laser pulse and two counter-propagating laser pulses (with the total field amplitude divided between them in varying ratios) with a near-critical density plasma using 1D3V Particle-in-Cell (PIC) simulations. The study focuses on the dependence of key properties of the emitted photon bunch on the amplitude ratio, comparing them with the single collective pulse scenario. For counter-propagating pulses, nonlinear inverse Compton scattering results in the maximum photon emission occurring early during the collision of the pulses. The directionality of emitted photons along the pulse propagation direction is highest for counter-propagating pulses and lowest for the single collective pulse. Larger differences in divided field amplitudes bring the results closer to those of a single collective pulse. The maximum electron energy cutoff and emitter number are observed for counter-propagating pulses with amplitude ratios of 0.9:0.1 and 0.8:0.2, respectively, while the ratio 0.5:0.5 shows minimal values. The peak photon density corresponds to the highest cutoff energy, observed for the 0.9:0.1 counter-propagating pulses. Furthermore, the total absorbed energy by electrons and photons directly correlates with the injected electromagnetic energy into the system, being highest for the single pulse scenario. However, the overall electromagnetic radiation emission is maximized for counter-propagating pulses. These findings provide insights valuable for optimizing high-power laser interactions with plasmas and their applications.
کلیدواژهها English