RF Accelerating Voltage Control and Stabilization in the TRIUMF Cyclotron
The basic RF system of the TRIUMF cyclotron consists of a resonant accelerating electrode structure powered at 23.05 MHz by a 1.8 MW transmitter.l The prime objective of the RF control system descri5ed in this paper is to ensure an accelerating voltage of stable amplitude and frequency. Through the extensive use of feedback loops and fixed-program logic circuits the problems of multipactoring, resonator detuning, RF vol tage breakdown, and RF voltage disturbances are dealt Iwi th. The system is almost completely automatic, so that straightforward operation of the RF system, via a CAMAC link, from the main cyclotron control desk is achieved.