NSRRC Activity Report 2022

Facility Development and Status 089 PS, 5.26 , 10% Cryogenic, 0, 0% BD, 0, 0% RF, 8.41, 15% I&C, 10.96, 20% Operation, 1.5, 3% Magnet, 1.28, 2% Vacuum, 1.07, 2% Utility, 0, 0% Safety, 0, 0% Linac, 5.12, 9% Other, 21.4, 39% index as the shot-to-shot photon intensity variation of the diagnostic beamline with a ratio better than 0.1%. In 2022, the annual availability was 98.9% with a scheduled user time of 5,040 hours, the MTBF was 168 hours, and the beam stability was 99.3%. Downtime and Failure Analysis of the TLS In 2022, there were a total of 29 beam trips. The accumulated downtime of each subsystem is shown in Fig. 3 , with a total of 55 hours. The major downtime of 21 hours is contributed by other factors, including earthquakes, power spikes, noise, and beamlines. Taiwan Photon Source (TPS) Machine Parameters of the TPS As a synchrotron light source opened to users for less than seven years, the Taiwan Photon Source (TPS) accelerator features low emittance, top-up injection, superconductivity RF module operation, and high stability. Listed in Table 3 are the major parameters of the TPS storage ring for current operation. The TPS accelerator tunnel includes a storage ring and a booster ring placed concentrically. Statistics of TPS Machine Operation The TPS was first opened to users in the last quarter of 2016 with a beam current of 300 mA, which was raised to 400 mA in December 2017, and then regularly reached 450 mA o n the last day of 2020. In 2021, beam operation reached 500 mA for users. Both the scheduled and delivered user times and the availability since 2016 are shown in Fig. 4 (see next page) quarter by quarter. In 2022, the annual availability was 98.7% with a scheduled user time of 4,824 hours and the mean time between failures reached 130 hours, as shown in Fig. 5 (see next page) together with the year statistics since 2017. Table 3 : Main parameters of the TPS storage ring. Fig. 2 : Annual values for the beam stability index of 0.1%, availability, and MTBF of the TLS from 2011 to 2022. Fig. 3 : Downtime distribution for the TLS accelerator in 2022. (Downtime 55 hours) Beam energy (GeV) 3 Circumference (m) 518.4 Current (mA) 500 Number of buckets 864 Beam emittance (ε x /ε y ) (nm-rad) 1.6/0.016 Momentum compaction (α 1 /α 2 ) 0.0024/0.0021 RF voltage (MV) 2.8 Synchrotron tune (ν s ) 5.42 × 10 −3