NSRRC Activity Report 2023

Facility Development and Status 101 Fig. 1 : Development timeline of solid-state technology in the NSRRC. system is illustrated in Fig. 4 . The electromagnetic valves are controlled through the digital output of the Galil controller, establishing EPICS server PV control switches. The pressure gauge uses the Modbus/RS485 interface to read the chamber pressure, which is then transmitted to the Galil controller, establishing the EPICS server PV. There is no readily available flow meter for use. Therefore, EPICS support software components for flow meters have been developed to ensure that all devices in the automation system support the EPICS architecture. Users and beamline managers can directly design experimental processes for different operational features without considering new hardware control issues through PVs. This component enables the rapid development of the TLS 07A1 automation system, achieving the expected results of automated experiments in a short period. (Reported by Chin-Kang Yang) Reference 1. H. S. Wang, W.-Y. Lai, K.-H. Hsu, C.-K. Kuan, C.-W. Hu, S.-A. Chen, B.-Y. Shew, “Design and Implementation of the Au- tomic Control System at TLS 07A1 Endstation, ” NSRRC Internal Report (2022). Operation of a 300-kW TPS Solid-State Power Amplifier S olid-state radio frequency (RF) technology applied in high-power RF sources is a trending topic in the field of accelerators. This technology involves low-power solid-state power amplifier (SSPA) modules to output a maximum RF power of approximately 1 kW. These modules are then combined to output high RF power, potentially replacing conventional vacuum tube equipment. Solid- state RF technology does not require high-voltage devices; instead, it operates with tens of volts of DC voltage to drive the transistors. Additionally, due to the total power output being composed of multiple stacked modules, such systems have substantial redundancy, enabling them to maintain stable output even in the case of a failure in a few modules, preventing system trips. Since 2011, the NSRRC has developed solid-state technology in house, progressing from circuit boards of solid-state modules 1 and power combiners to combinations of high-power units 2 and prototype testing in the RF laboratory. 3 Finally, in 2021, a 500-MHz and 300-kW SSPA RF transmitter was successfully constructed at the Taiwan Photon Source (TPS), and long-term operation commenced in August 2023. The development timeline of solid-state technology in the NSRRC is illustrated in Fig. 1 . This 300-kW solid-state RF transmitter can reliably deliver approximately 250 kW of output power during user operation at the TPS with a beam current of 500 mA. Furthermore, this device produces significantly reduced