A collision of supersonic jets in the double-cone ignition scheme was experimentally realized. With a very high deceleration, the supersonic jets merge into a high density plasma core, which will be further fast heated to ignition condition. Both the density and temperature of the plasma core is increased with a nearly 100% conversion from the kinetic energy of the jets to the internal energy. Multiple diagnostics are applied to characterize the plasma including an X-ray Thomson scattering, a hard X-ray monochromatic backlighting, an X-ray streak imaging and a framing imaging devices. The density of the supersonic jet is about 5.5~8 g/cm<sup>3</sup>. During the colliding, a stagnation phase lasts about 200 ps, and the maximum density of the plasma core is increased to 46±24 g/cm<sup>3</sup>. By analyzing the velocity and temperature before and after colliding, it is found 90% of the kinetic energy has converted into thermal one.
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