A prototype fast feedback system for energy lock at CEBAF
ABSTRACT The beam energy of CEBAF must be controlled accurately against
phase and gradient fluctuations in RF cavities in order to achieve a
2.5×10-5 relative energy spread. A prototype fast
feedback system based on the concepts of modern control theory has been
implemented in the CEBAF control system to function as an energy lock.
Measurements performed during the pulsed mode operations indicate
presence of noise components at 4 Hz and 12 Hz on beam energy. This fast
feedback prototype operates at 60 Hz rate and is integrated with EPICS.
This paper describes the implementation of the fast feedback prototype,
and operational experience with this system at CEBAF