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In inertial confinement fusion the target implosion non-uniformity isintroduced by a driver beams' illumination non-uniformity, a fuel targetalignment error in a fusion reactor, the target fabrication defect, et al. Fora steady operation of a fusion power plant the target implosion should berobust against the implosion non-uniformities. In this paper the requirementfor the implosion uniformity is first discussed. The implosion uniformityshould be less than a few percent. A study on the fuel hotspot dynamics is alsopresented and shows that the stagnating plasma fluid provides a significantenhancement of vorticity at the final stage of the fuel stagnation. Thennon-uniformity mitigation mechanisms of the heavy ion beam (HIB) illuminationare also briefly discussed in heavy ion inertial fusion (HIF). A density valleyappears in the energy absorber, and the large-scale density valley also worksas a radiation energy confinement layer, which contributes to a radiationenergy smoothing. In HIF a wobbling heavy ion beam illumination was alsointroduced to realize a uniform implosion. In the wobbling HIBs illumination,the illumination non-uniformity oscillates in time and space on a HIF target.The oscillating-HIB energy deposition may contribute to the reduction of theHIBs' illumination non-uniformity by its smoothing effect on the HIBillumination non-uniformity and also by a growth mitigation effect on theRayleigh-Taylor instability.

Uniformity of fuel target implosion in Heavy Ion Fusion