RF controls for MICE Andrew Moss Sept 06

What we need A flexible easy to use solution to control the amplitude, phase and timing of the MICE RF amplifiers Systems that EPICS can talk too easily Off the shelf components to reduce design time

Direct Digital Synthesizers DDS Digital oscillators that can be programmed via serial/parallel ports Up to 32 bit frequency registers 14 bit phase offset registers Phase continuous Very flexible way to produce RF

Synchronised channels 4 channel DDS Independent control of 4 RF channels synchronised to the same clock Independent control of phase, amplitude and frequency Excellent channel isolation Serial port Communication

EPICS interface DDS can be loaded via serial port Control registers used to manipulate the output 32 bits for frequency, 14 bits for phase and 10 bits for amplitude May be possible to use these devices as part of the feedback loop if high speed is not an issue

Timing Digital timing system with 5 multiple outputs Serial comms Very flexible and powerful Low noise/jitter Can EPICS provide the timing signals ?

Monitoring Each amplifier/cavity will have the following signals –Station phase set point + reedback –Station amplitude set point + readback –Forward & reflected RF power signals from each amplifier and key sections of the RF transmission path –Cavity probe power –Phase & gain control system –Temperature monitoring of critical components

Basic Layout of LLRF system

The experiment RF systems will have to be ‘tuned’ on the experiment Using synchronised oscillators will help to set the systems up quickly With EPICS control of all parameters there will be lots of data and the ability to control the systems easily