The Capacitor charger (CCR) can be considered as a current generator (Norton model). He's suitable for all applications that need very fast regulation with big voltage amplitudes and repeated charging and discharging (total or more than 50% of the max).
The CCR has a very low stored energy and may hold a shoting rate up to 1kHz*. CCR machine must operate with an essentially capacitive load. Its regulation mode differs from a SR and prevent from any overshot.
Using a CCR as a Regulated power Supply is not recommended.