Report
Cross-beam energy transfer saturation by ion trapping-induced detuning
| العنوان: | Cross-beam energy transfer saturation by ion trapping-induced detuning |
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| المؤلفون: | Nguyen, K. L., Yin, L., Albright, B. J., Hansen, A. M., Froula, D. H., Turnbull, D., Follett, R. K., Palastro, J. P. |
| سنة النشر: | 2021 |
| المجموعة: | High Energy Physics - Theory Physics (Other) |
| مصطلحات موضوعية: | Physics - Plasma Physics, High Energy Physics - Theory |
| الوصف: | The performance of direct-drive inertial confinement fusion implosions relies critically on the coupling of laser energy to the target plasma. Cross-beam energy transfer (CBET), the resonant exchange of energy between intersecting laser beams mediated by ponderomotively driven ion-acoustic waves (IAW), inhibits this coupling by scattering light into unwanted directions. The variety of beam intersection angles and varying plasma conditions in an implosion results in IAWs with a range of phase velocities. Here we show that CBET saturates through a resonance detuning that depends on the IAW phase velocity and that results from trapping-induced modifications to the ion distribution functions. For smaller phase velocities, the modifications to the distribution functions can rapidly thermalize in the presence of mid-Z ions, leading to a blueshift in the resonant frequency. For larger phase velocities, the modifications can persist, leading to a redshift in the resonant frequency. Ultimately, these results may reveal pathways towards CBET mitigation and inform reduced models for radiation hydrodynamics codes to improve their predictive capability. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/5.0054008 |
| URL الوصول: | http://arxiv.org/abs/2104.07725 |
| رقم الانضمام: | edsarx.2104.07725 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/5.0054008 |
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