A new approach for high energy density physics experiments using intense ion beams is presented. To make dense matter plasma as the interior of Jupiter, we use a diamond anvil cell for isentropic compression and the intense ion beams for isochoric heating. Results indicated that the temperature of 10ρ_s (ρ_s: solid density) pre-compressed target can be achieved 4000 K irradiated by argon ion beams. We also investigated a radiation hydrodynamics (RH) target for understanding optical properties. Making well-defined RH plasma, we calculated the spherical target using intense ion beams. The results indicated that the spherical target plasma could be point-spot like temperature distribution and target size was about 0.4 mm full width of half maximum.