Pump with broadband probe experiments for single-shot measurements of plasma conditions and crossed-beam energy transfer
physics.plasm-ph
/ Authors
A. Longman, R. Muir, D. Mittelberger, E. Grace, C. Goyon, G. Swadling, G. Kemp, T. Chapman, S. Maricle, N. Vanartsdalen
and 7 more authors
A. Linder, T. Dumbacher, K. Zoromski, B. Stuart, F. Albert, J. Heebner, P. Michel
/ Abstract
A novel technique for measuring plasma conditions using monochromatic pump-broadband probe laser interactions has been experimentally demonstrated. Originally proposed in [J. Ludwig et al., Phys. Plasmas \textbf{26}, 113108 (2019)], this method utilizes crossed-beam energy transfer between the broadband probe and the pump, mediated by plasma ion acoustic waves. The complete energy transfer spectrum can be captured in a single shot, enabling the inference of plasma parameters such as density, electron and ion temperatures, and flow velocity. Compared to Thomson scattering, this technique offers signal enhancements typically larger than 9 orders of magnitude, significantly reducing the required probe laser intensity and facilitating interactions that are linear and measurements that are non-perturbative of the plasma. Furthermore, it provides a powerful tool for advancing studies of crossed-beam energy transfer under conditions relevant to inertial confinement fusion experiments.