The focal spot size of the short pulse petawatt (PW) system for fast ignition [8,9] is a few microns to several tens of microns [10–13], which is called the small-scale focal spot.
The focal spot size of the short pulse petawatt (PW) system for fastignition [8,9] is a few microns to several tens of microns [10–13],which is called the small-scale focal spot.