A High Stability Voltage Programmed RF Source for the Zero Gradient Synchrotron

The oscillator described in the text generates a frequency program which sweeps between 4 - 13.7 MHz with an initial df/dt of 172 MHz/sec and a final df/dt of 420 kHz/sec. This program is stable within 0.025% of the required value. FM noise on the order of 800 cps peak-to-peak appears on the first part of the program and reduces to less than 250 cps p - p near the end. A second rf output is provided which sweeps 1 MHz above the 4 - 14 output to be used with beam monitoring equipment employing a 1 MHz heterodyne technique. Both rf outputs employ AGC loops to maintain 2vpp across 125Ω.