The 6th International Conference on Matter and Radiation at Extremes (ICMRE2023)

278 / 2023-04-24 20:43:58

Observation of a non-equilibrium effect in an indirectly driven implosion

non-equilibrium plasma,ion temperature,electron temperature,indirectly driven implosion

Inertial Confinement Fusion Physics > Drivers, targets and diagnostics-I

    The implosion core in inertial confinement fusion can be driven out of thermal equilibrium with a rapid heating, such as strong shock and α-particle energy deposition [1, 2]. It is also shown that the mix of contaminant mass with the fusion plasma is not necessarily in thermal equilibrium [3]. The observation of the non-equilibrium is not only helpful for understanding the capsule implosion dynamics in physics models, such as the collisional heat-transfer processes in high energy density physics [4]

    In this report, we present the recent progress on the indirectly driven non-equilibrium implosion experiment at a 100kJ laser facility. The strong shock behind a very thin shell capsule will preferentially heats ions and significantly separates the ion-electron temperature with T_i>T_e>T_r. A trace element X-ray spectroscopic method is discussed to obtain the time-and space- dependence electron temperature of implosion core. A concept for combining the neutron production rate and neutron time-of-flight, with a priori knowledge of ion density and volume, is presented to extract the time-resolved ion temperature. The uncertainty will be further assessed in our future work.

1. R. C. Shah et al., Phys. Rev. E, 106, L013201 (2022)


2. A. S. Moore et al., Review. Sci. Instrum., 93, 113536 (2022)


3. B. M. Haines, Nat. Commun., 11, 544 (2020)


4. C. Ellison, Phys. Plasmas, 25, 072710 (2018)