RF Control System Upgrade at TFUUMF

The low level rf control system for the 23 MHz, 1MW rf A simplified block diagram of the system is shown in drive of the TRIUMF cyclotron is being completely Figure 1. redesigned using state-of&t hardware and software. ” Frequency control using direct digital synthesis provides good frequency resolution, as well as allowing rapid changes in frequency. Digital signal processors (DSPs) are used in the amplitude and phase regulators. This permits adaptive control of feedback parameters, and eliminates drift due to component aging. The entire system is housed in a single c.::~--VXI mainframe, which provides a low noise environment for feedbDck the feedback control circuitry. Functional modularity is provided by different plug-in modules. Local intelligence in the VXI controller automates the logically intensive routines such as power-up sequencing. It also provides supervisory. controls to the rest of the modules and communicates with the site-wide control system. / I 71-- ~-~_I 4MFL,PHASF upF to MOOULATOR 1 / H---J 0nl