Title :
The CEBAF fiber optic phase reference system
Author :
Crawford, K. ; Simrock, S. ; Hovater, C. ; Krycuk, A.
Author_Institution :
Continuous Electron Beam Accel. Facility, Newport News, VA, USA
Abstract :
The specified phase stability of the CEBAF RF distribution system is 2.9° RMS per linac. Stability is achieved through the use of a temperature and pressure regulated coaxial drive line. The purpose of the fiber optic phase reference system is to monitor the relative phase at the beginning and ending of this drive line, between linacs, injector and separator to determine drift due to ambient temperature fluctuations. The system utilizes an Ortel 1310 nm single mode laser driving Sumitumo optical fiber to distribute a reference signal at 1497 MHz. The phase of this reference signal is compared to the 1427 MHz (LO) and the 70 MHz (IF) via a 360° phase detector. The detected information is then routed to the CEBAF control system for display with a specified resolution of ±0.2° over a 20° phase delta
Keywords :
accelerator RF systems; accelerator control systems; electron accelerators; optical fibres; particle beam injection; particle beam stability; 1310 nm; 1427 MHz; 1497 MHz; 70 MHz; CEBAF RF distribution system; CEBAF control system; CEBAF fiber optic phase reference system; Ortel single mode laser; Sumitumo optical fiber; ambient temperature fluctuations; drive line; injector; linac; phase stability; pressure regulated coaxial drive line; temperature regulated coaxial drive line; Coaxial components; Fluctuations; Linear particle accelerator; Monitoring; Optical fibers; Particle separators; Phase detection; Radio frequency; Stability; Temperature;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505675
