Abstract
Recent results of monoenergetic acceleration obtained at several institutes paved the way for the development of laser-driven particle accelerators, which can be miniaturized to a scale of 1/1000. Experiments covered the plasma density range and laser power range of 1.6×1018-1.5×1020 cm-3 and 2-30 TW, respectively. The experimental results revealed empirical scaling on energy gain, which was proportional to laser power and inversely proportional to electron density. Monoenergetic beams were obtained in narrow regions of electron density at given laser powers. These features of acceleration suggest that electrons injected by localized wavebreaking were accelerated by a potential well in plasma formed by an ultra-short laser pulse.
