“…The energy efficiency is called driver efficiency η d in ICF. Accelerators also have a flexibility to control the HIB parameters, for example, focusing position, beam focal radius, particle energy distribution in a beam, ion energy, pulse length, pulse shape, HIB axis oscillation/wobbling motion, operating repetition rate, etc [12,[16][17][18][19][20][21][22][23][24][25][26]. Another important preferable feature is to deposit HIB energy inside a material.…”