Title :
A prototype fast feedback system for energy lock at CEBAF
Author :
Chowdhary, M. ; Krafft, G.A. ; Shoaee, H. ; Simrock, S.N. ; Watson, W.A.
Author_Institution :
Continuous Electron Beam Accel. Facility, Newport News, VA, USA
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
Keywords :
accelerator RF systems; accelerator cavities; accelerator control systems; beam handling techniques; electron accelerators; fluctuations; particle beam diagnostics; particle beam stability; 12 Hz; 4 Hz; 60 Hz; CEBAF; EPICS; RF cavities; beam energy; control theory; energy lock; gradient fluctuations; noise components; operational experience; phase fluctuations; prototype fast feedback system; pulsed mode operation measurements; relative energy spread; Control systems; Control theory; Energy measurement; Feedback; Fluctuations; Noise measurement; Performance evaluation; Prototypes; Pulse measurements; Radio frequency;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505569
