[en] Implosion studies are presented, the aim of which are to explore the transition between exploding and ablative regimes. Enhancement of rho(DT) and (rhoR)(DT) has lead to reduce the preheat factors and optimize the laser →fuel energy transfer by imploding thickened targets with intermediate laser pulse (500 ps). X-ray shadowgraphy has been developped, as a suitable diagnostic for ablative target probing. Numerical simulations have been performed with a 1-D lagrangian code, a particular attention being beared on the description of suprathermal transport. Increasing the thickness of the target shell has been checked to lower the preheat and induce a more ablative behaviour; a maximum in final DT density has been observed