sentences:  Ignition is started by a very-short (~10 picoseconds) ultra-high-power (~70 kJ, 4 PW) laser pulse, aimed through a hole in the plasma at the core.The light from this pulse interacts with the cool surrounding fuel, generating a shower of high-energy (3.5 MeV) relativistic electrons that are driven into the fuel.The electrons heat a spot on one side of the dense core, and if this heating is localised enough it is expected to drive the area well beyond ignition energies.