Sirius Digital Low-Level RF Status

TL;DR

This paper discusses the development and commissioning of a digital Low-Level RF control system for Sirius, a 4th generation synchrotron light source, highlighting its performance and integration in high power operations.

Contribution

It introduces a digital DLLRF system based on ALBA DLLRF for Sirius, demonstrating its successful control of both normal conducting and superconducting RF cavities.

Findings

DLLRF system successfully controls RF cavities in high power operation

Integration with RF system enables automatic start-up and diagnostics

First operation achieved in the Booster DLLRF system

Abstract

Sirius is a Synchrotron Light Source Facility based on a 4th generation low emittance storage ring. The facility is presently in the final assembly phase in Campinas, Brazil, and comprises a 3 GeV electron storage ring, a full energy Booster and a 150 MeV Linac. The Booster RF system is based on a single 5-cell RF cavity driven by a 45 kW amplifier at 500 MHz and is designed to operate at 2 Hz repetition rate. The storage ring will initially use one normal conducting 7-cell RF cavity and, in the final configuration, will comprise two superconducting cavities, each one driven by a 240 kW RF amplifier. A digital LLRF system based on ALBA DLLRF has been designed and commissioned to control both normal conducting and future superconducting RF configurations. The first DLLRF system is already in operation in the injector Booster. This paper presents an overview of the performance of the control loops in high power operation and the results of the Booster DLLRF commissioning. It also shows the integration of DLLRF with the RF system as well as other utilities of the system such as automatic start-up, conditioning, fast interlocks and post-mortem analysis.