Speaker
Description
The design of low-level feedback (LLRF) controllers used to stabilize the amplitude and phase of the field inside the RF cavities is typically customized, depending on the frequency and mode of operation. IUAC, New Delhi, India, operates accelerators with RF structures in the range of 12.125-97 MHz, in both normal and superconducting modes. Currently, all the LLRF controllers that have been operational for many years are structure-specific and designed in the analog electronics domain. Component ageing, obsolescence, and limited availability have made it challenging to maintain them due to frequent failures. To overcome this, a universal digital controller has been developed whose design is based on the philosophy of using the same hardware for all the RF structures at IUAC. It is a compact, reconfigurable, and standalone device featuring a microcontroller programmed fractional Phase Locked Loop multiplier for generating various LO signals and system clocks, a wideband analog front end for up/down conversion and signal conditioning, and a System-on-Chip FPGA-based digital board with fast ADCs and DACs, all controlled using an EPICS IOC. The controller is designed as a Sawtooth Waveform Generator for the multi-harmonic buncher, a generator-driven, and a self-excited loop-based LLRF for various RF cavities at IUAC. It operates within acceptable limits of 1% RMS variation in amplitude & a ±1-degree variation in phase. Design details & test results will be discussed in the paper.
| In which format do you inted to submit your paper? | LaTeX |
|---|