Abstract
We have proposed a dynamic smoothing method based on a phase control to smooth plasma non-uniformities in perturbed plasma systems. In this paper, the dynamic smoothing method is applied to a spherical direct-driven fuel target implosion in heavy ion inertial confinement fusion. We found that the wobbling motion of each heavy ion beam (HIB) axis induces a phase-controlled HIBs energy deposition, and consequently the phase-controlled implosion acceleration is realized, so that the HIBs irradiation non-uniformity is successfully smoothed. HIB accelerators provide a well-established performance to oscillate a HIB axis at a high frequency. In inertial confinement fusion, a fuel implosion uniformity is essentially significant for achieving the DT fuel compression and for releasing the fusion energy, and the non-uniformity of the implosion acceleration should be less than a few %. The results in this paper demonstrate that the wobbling HIBs would provide an improvement in the fuel target implosion uniformity.
Highlights
In inertial confinement fusion, the fusion fuel should be compressed to a high density to reduce an input driving energy[1,2]
The results demonstrate that the dynamic smoothing mechanism would improve the fuel target implosion uniformity by the wobbling heavy ion beam (HIB) in heavy ion inertial confinement fusion (HIF)
We have presented the dynamic smoothing of the target implosion non-uniformity, originated from the HIBs illumination non-uniformity, through the spiral wobbling HIBs in HIF
Summary
The initial perturbation in the unstable system is assumed to be imposed at t = 0, and the perturbation grows with the growth rate of γ. If the perturbation is actively superimposed on the system at t = Δt, and if the perturbation added has the inverse phase as shown, the integrated amplitude growth is mitigated (see Fig. 1(c)). Even for Ω ≅ γ we can still expect the significant mitigation At this point, it should be noted that the integrated perturbation amplitude is mitigated well, but the growth rate γ of the instability does not change. The result in Eq (2) suggests that the wobbling frequency Ω should be high compared with the instability growth rate of γ for the effective mitigation of the integrated perturbation amplitude
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