1. 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

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

3. 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

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

5. 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

6. 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

7. Operation Status of
the RF System in TLS

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

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

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

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

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

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

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

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

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

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

18. 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.

19. 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.

20. 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.

21. 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.

22. Operation Status of
the RF System in TPS

23. 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.

24. 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

25. 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

26. 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.

27. Operation of the 300-kW RF System
MTBF: 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

28. 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;

29. 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.