A vector control and data acquisition system for the multicavity LLRF system for cryomodule1 at Fermilab

TL;DR

This paper presents a scalable vector control and data acquisition system for a multi-cavity cryomodule at Fermilab, utilizing FPGA-based processing and high-speed data storage, adaptable to future expansions.

Contribution

It introduces a scalable, FPGA-based LLRF control system with high-speed data acquisition for cryomodules, capable of supporting up to 24 cavities without extra hardware.

Findings

System effectively controls 8 cavities with high precision.

Design is scalable to more cavities with minimal hardware changes.

Performance evaluations demonstrate system reliability and accuracy.

Abstract

A LLRF control and data acquisition system for the 8-cavity cryomodule1 at the ILCTA has been implemented using three 33-channel ADC boards in a VXI mainframe. One card each is dedicated to the cavity probes for vector control, forward power and reverse power measurements. The system is scalable to 24 cavities or more with the commissioning of cryomodules 2 and 3 without additional hardware. The signal processing and vector control of the cavities is implemented in an FPGA and a high speed data acquisition system with up to 100 channels which stores data in external SDRAM memory. The system supports both pulsed and CW modes with a pulse rate of 5 Hz. Acquired data is transferred between pulses to auxiliary systems such as the piezo controller through the VXI slot0 controller. The performance of the vector control system is evaluated and the design of the system is described.