Electro-magnetically driven shock and dissociated hydrogen target for stopping power measurement

A design study of electro-magnetic shock tube for dissociated gas targets is presented. Behind the shock front, there is a dissociated gas region without ionization. That is suitable target for the stopping power measurement when we have an appropriate shock velocity. The previous experiments showed that the dissociated target duration with uniform density and temperature profiles as long as microsecond was required for synchronization with projectile. A new shock tube with long drift section is proposed. The duration of shock heated region can be estimated to be 2 μ s in this design. This configuration enables us to measure the difference of the stopping power between molecules and dissociated atoms for heavy ion beams more reliably.