Speaker
Description
A third-generation light source SPring-8 has been operated for 20 years. Many of high power components and electrical circuits were aged and outdated. We have updated and reconstructed these components and systems for next 20 years operation, in advance of the upgrade project SPring-8-II. The 8 GeV storage ring has four RF stations to generate a voltage of 16 MV at the frequency of 508.58 MHz. Each RF station consists of 8 bell-shaped single cell cavities driven by a 1.2 MW klystron, combined with a low-level RF system. First, we replaced klystron power stations, supplying a high voltage of 90 kV and a current of 20 A with simple and reliable architecture. Next, we have reconstructed the low-level RF system for one of the RF stations, with newly developed Micro-TCA based modules. The new system is remarkably compact, flexible, and conserves high accuracy of the RF amplitude and phase control. In addition, a vacuum system and an interlock system were also replaced to the new systems with PLC and EtherCAT network connection. This presentation reports these upgrade activities.