Master Oscillator and RF Distribution System

Description: This is the accelerator's heartbeat. All RF signals are derived from the MO, and distributed to the linear accelerators via (expensive) coaxial cables. The requirements of such a system are such that high-stability, low-noise quartz oscillators must be used as a reference frequency. Synthsizers are then used to produce the VHF, UHF, and microwave frequencies need for the acceleration of electrons. The Distribution System is responsible for transmitting the signals to their respective "RF zones" encompassing almost 1 mile around the CEBAF ring. The phase reqiurements of the system restrict thermal expansion to less than 1 cm throughout. This is controlled by the use of PID temperature controllers and "heat tape" which maintains a 95 F temperature of the coaxial cables. EID Group Memeber(s) Involved: Musson, John Send comments/suggestions to allison@jlab.org