2020同步年報

088 ACTIVITY REPORT 2020 Status of TLS and TPS Accelerators Taiwan Light Source (TLS) Machine Parameters of TLS As a compact synchrotron light source but with nine tradi- tional and superconducting insertion devices in total that have served users for 26 years, TLS accelerator features top-up injection, superconductivity RF-module operation and modern feedback technologies. Listed in Table 1 are the major parameters of the TLS storage ring for current operation, whereas locations of insertion devises and related parameters are shown in Fig. 1 and listed in Table 2 , respectively. Table 1 : Main parameters of TLS storage ring. Beam energy (GeV) 1.5 Number of buckets 200 Current (mA) 360 Horizontal emittance (nm·rad) 22 Vertical emittance (pm·rad) 88 Tunes (ν x /ν y ) 7.303/4.175 RF voltage (MV) 1.6 Lifetime (hour) 7.5 Table 2: Main parameters of insertion devices in TLS. W200 U50 U90 EPU56 SWLS SW60 IASWA IASWB IASWC Type Hybrid Hybrid Hybrid Pure SC SC SC SC SC Period length (mm) 200 50 90 56 250 60 61 61 61 Photon energy (eV) 800−15k 60−1.5k 5−500 80−1.4k 2k−38k 5k−20k 5k−20k 5k−23k 5k−20k EPU56 SWLS SW60 IASW60-R4 W200 IASW60-R6 U90 SRF Cavity IASW60-R2 U50 TLS Fig. 1 : Layout of the TLS accelerator. Statistics of TLS Machine Operation At the beginning of 200-mA top-up injection operations in October 2005 directly after installation of the SRF module, TLS gradually raised the stored beam current to achieve 360 mA in 2010. Performance indicators for TLS operation from 2011 to 2020 are shown in Fig. 2 , in which availability is defined as the ratio of delivered user time to the scheduled user time,