The fuel capsule wall is synthesized using light elements ( like plastic, beryllium, or high density carbon, i.e. diamond) . The outer portion of fuel capsule explodes outward when ablated by the x-rays produced by the hohlraum wall upon irradiation by lasers. Due to Newton's third law, the inner portion the fuel capsule implodes, causing the D-T fuel to be supercompressed activating fusion reaction. The capsule must be precisely spherical , with texture roughness less than one nanometer, for fusion ignition to start. Otherwise instability will cause fusion to fizzle. The fuel capsule contains a small fill hole with less than 5 microns diameter, to inject the capsule with D-T gas.