Operation Status of the RF Systems and Taiwan Photon Source CWRF2016 Operation Status of the RF Systems in Taiwan Light Source and Taiwan Photon Source Ming-Chyuan Lin NSRRC, Taiwan

Two Light Sources in NSRRC Taiwan Light Source (TLS) Taiwan Photon Source (TPS)

Machine Parameters Main parameters TLS TPS Energy [GeV] 1.5 3.0 LINAC [MeV] 50 150 Circumference of SR [m] 120 518.4 Number of buckets 200 864 Current [mA] 360 500 Bunch length [psec] 31 9.5 Horizontal emittance [nm-rad] 22 1.6 Vertical emittance [nm-rad] 0.088 0.016 Tunes (νx/νy) 7.302/4.17 26.18/13.28 Vertical (rms) orbit stability [um] 1 0.2 Coupling [%] 0.4 < 1 RF voltage [MV] 2.8 ~ 3.5 Lifetime [hour] 6 10 Straight Sections 6m X6 12m X6 & 7m X18

Taiwan Light Source (TLS) Operation Status of Taiwan Light Source (TLS) A compact ring with 9 IDs and 25 beamlines

Annual user beam time > 5,000 hours, Availability > 96% Status of TLS (1) Annual user beam time > 5,000 hours, Availability > 96% update to July 31, 2015

Status of TLS (2) Beam stability: update to July 31, 2015 Beam stability: ratio of user beam time with relative intensity fluctuation < 0.1% MTBF: Mean Time Between Failure

Operation Status of the RF System in TLS

RF System of TLS (1) Transmitter and Klystron: 100 kW for storage ring, 60kW for booster ring update to July 31, 2015

RF System of TLS (2) Cavity: CESR-type SRF module for storage ring Doris Cavity for booster ring update to July 31, 2015

RF System of TLS (3) Low Level RF: Analog type SRF Electronics: for SRF module and valve box update to July 31, 2015

RF System of TLS (4) Normal operation at 90 kW Gap voltage of SRF cavity at 1.6 MV update to July 31, 2015

RF System of TLS (5) Statistics of MTBF update to July 31, 2015

RF System of TLS (6) Statistics of Failure update to July 31, 2015

RF System of TLS (7) Oscillation of SRF module caused by LHe filling of an superconducting wiggler nearby. update to July 31, 2015

RF System of TLS (8) Solution: Beam processing twice a year. (scanning the loading angle at high beam current) update to July 31, 2015

RF System of TLS (9) Energy Saving on booster RF system update to July 31, 2015

Taiwan Photon Source (TPS) Operation Status of Taiwan Photon Source (TPS)

Recent Progress of TPS 2014 July: 150 MeV LINAC commissioning. Dec. 16: Ramping electrons to 3 GeV in the booster ring. Dec. 31: electron beam was firstly stored in the storage ring (5 mA). 2015 Feb. 9: Beam current up to 100mA (phase-I accelerator commissioning). Mar. 31: Beam dose for Vacuum cleaning reached 35 A-hr. Apr. to Aug.: Installing two SRF modules and ten IDs . Improving transport line from booster to storage ring. Sep. 14: Starting phase-II accelerator commissioning with SRF modules, IDs, and beam lines. Dec. 12: Reaching 520 mA (Decay mode). 2016 Mar. 24 ~ June 28: User mode operation (for beamline commissioning). May 26: 300 mA top-up mode, for user operation. June 16: 400 mA top up mode, for testing. Sep. 22~ Dec. 27: User mode operation.

TPS: Phase-I Accelerator Commissioning Up to 100 mA (with two PETRA cavities) The test of the top-up injection at 100 mA. Beam lifetime achieved ~ 6 hours. The test of single bunch operation, the bunch current around 8.6 mA with purity of 10^-5 comparing to side bunch. Highest single bunch is around 12 mA. 0.4 mA/s needs 1000 s to reach 400 mA. It will take 17 minutes for initial injection. Some optimization will be take during the machine study. When the lifetime improvement and injection efficiency increase, the injection time will reduce.

TPS: Phase-II Accelerator Commissioning Up to 500 mA (with two SRF modules) 350 mA top-up mode The test of the top-up injection at 100 mA. Beam lifetime achieved ~ 6 hours. The test of single bunch operation, the bunch current around 8.6 mA with purity of 10^-5 comparing to side bunch. Highest single bunch is around 12 mA. 0.4 mA/s needs 1000 s to reach 400 mA. It will take 17 minutes for initial injection. Some optimization will be take during the machine study. When the lifetime improvement and injection efficiency increase, the injection time will reduce.

TPS: Beamline Commissioning Up to 300 mA (with two SRF modules) Availability: 96.2% in average The test of the top-up injection at 100 mA. Beam lifetime achieved ~ 6 hours. The test of single bunch operation, the bunch current around 8.6 mA with purity of 10^-5 comparing to side bunch. Highest single bunch is around 12 mA. 0.4 mA/s needs 1000 s to reach 400 mA. It will take 17 minutes for initial injection. Some optimization will be take during the machine study. When the lifetime improvement and injection efficiency increase, the injection time will reduce.

Operation Status of the RF System in TPS

100-kW RF System for TPS Booster Ring Ferrite Load and Circulator 100-kW transmitter LLRF PETRA Cavity Two SRF modules are installed in the TPS storage ring. The superconducting cavity inside the cryostat is operated at 4.4 K, which is achieved by liquid helium. The SRF-electronics takes care of the operation conditions of the cryostat and functions for more than 100 interlocks. The SRF cavity is powered by the 300-kW transmitter and klystron, with the accelerating voltage and feedback loops controlled by the low-level RF system.

300-kW RF System for TPS Storage Ring SRF module SRF electronics Two SRF modules are installed in the TPS storage ring. The superconducting cavity inside the cryostat is operated at 4.4 K, which is achieved by liquid helium. The SRF-electronics takes care of the operation conditions of the cryostat and functions for more than 100 interlocks. The SRF cavity is powered by the 300-kW transmitter and klystron, with the accelerating voltage and feedback loops controlled by the low-level RF system. LLRF 300-kW klystron 300-kW transmitter

Cryogenic Transfer System for TPS CVB4 TL5: 26.9 m CVB3 TL4: 25.4 m TL2: 30.3 m DVB CVB2 TL3: 27.1 m CVB1 SRF #2 SRF #1 Spare Section 7000-L Dewar 700-W Helium Cryogenic Plant DVB : Distribution Valve Box CVB : Control Valve Box for SRF module TL : Multi-channel Transfer Line The 700-W helium cryogenic plant and a 7000-liter Dewar are located outside the shielding tunnel. Some valve boxes and long multi-channel transfer lines are built and integrated to deliver liquid helium and liquid nitrogen to the SRF modules inside the shielding tunnel. Spare Section

Operation of the 300-kW RF System Two SRF modules are installed in the TPS storage ring. The superconducting cavity inside the cryostat is operated at 4.4 K, which is achieved by liquid helium. The SRF-electronics takes care of the operation conditions of the cryostat and functions for more than 100 interlocks. The SRF cavity is powered by the 300-kW transmitter and klystron, with the accelerating voltage and feedback loops controlled by the low-level RF system.

Operation of the 300-kW RF System MTBF: 171.4 hours in average Two SRF modules are installed in the TPS storage ring. The superconducting cavity inside the cryostat is operated at 4.4 K, which is achieved by liquid helium. The SRF-electronics takes care of the operation conditions of the cryostat and functions for more than 100 interlocks. The SRF cavity is powered by the 300-kW transmitter and klystron, with the accelerating voltage and feedback loops controlled by the low-level RF system. Number of Trip: 7 (2016 Mar. ~ May) Total failure time : 2.22 hours

Summary RF System in Taiwan Light Source Nine IDs and one SRF module in this compact ring. Great reliability of the 100-kW RF system. Beam processing twice a year. RF System in Taiwan Photon Source Operation with greater power due to more insertion devices and higher stored current in the coming years. Design goal of 500-mA operation with bare lattice was examined. Reliability to be improved. Coupler conditioning and beam processing every week. Digital LLRF in preparation. 126 staff +22 temp. labor For accelerator construction and TLS operation. 7 years for TLS; 3.5 years for the TPS;

Thank you for your attention. TLS budget: 126,000kNT; TPS budget 118,700kNT. Total budget for accelerators: 244,000 kNT. (included LN2 TPS 8,600NT and , maintentain for utility 13,000kNT) Extra Electricity: 110,000 kNT+180,000kNT. Thank you for your attention.