CWRF 2016 Operation Status of the RF Systems

CWRF 2016 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 1. 5 50 120 200 360 31 22 3. 0 150 518. 4 864 500 9. 5 1. 6 0. 088 7. 302/4. 17 0. 016 26. 18/13. 28 1 0. 2 Coupling [%] 0. 4 < 1 RF voltage [MV] 1. 6 2. 8 ~ 3. 5 6 10 6 m X 6 12 m X 6 & 7 m X 18 Energy [Ge. V] LINAC [Me. V] Circumference of SR [m] Number of buckets Current [m. A] Bunch length [psec] Horizontal emittance [nm-rad] Vertical emittance [nm-rad] Tunes (νx/νy) Vertical (rms) orbit stability [um] Lifetime [hour] Straight Sections

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

Status of TLS (1) Annual user beam time > 5, 000 hours, Availability > 96% Scheduled 99. 3% 99. 7% 99. 8% 99. 1% 99. 5% 99. 7% 99. 6% Delivered Percentage 99. 3% 99. 2% 99. 1% 98. 4% 2000 100% 98. 9% 97. 5% Hours 1600 95% 1200 800 90% 400 0 Season 85% 1 2 3 2013 4 1 2 3 2014 4 1 2 3 2015 4 1 2 2016 Availability 96. 7%

100% 240 95% 200 90% 160 85% 120 80% 80 75% 40 ΔI/I 0(<0. 1%) Availability MTBF (Hour) Stability & Availibility Status of TLS (2) MTBF 70% 0 2009 2010 2011 2012 Beam stability: ratio of user beam time with relative intensity fluctuation < 0. 1% 2013 2014 2015 2016 MTBF: Mean Time Between Failure

Operation Status of the RF System in TLS

RF System of TLS (1) Transmitter and Klystron: 100 k. W for storage ring, 60 k. W for booster ring

RF System of TLS (2) Cavity: CESR-type SRF module for storage ring Doris Cavity for booster ring

RF System of TLS (3) Low Level RF: Analog type SRF Electronics: for SRF module and valve box

RF System of TLS (4) Normal operation at 90 k. W Gap voltage of SRF cavity at 1. 6 MV

RF System of TLS (5) Statistics of MTBF 1200 Mean Time Between RF Failures 1000 SRF installed 600 400 200 16 20 15 20 14 20 13 20 12 20 11 20 10 20 09 20 08 20 07 20 06 20 05 20 04 20 03 0 20 Hour 800

RF System of TLS (6) Statistics of Failure 150 136 TLS Failure RF Failure 113 120 100 90 57 63 56 45 32 29 30 37 32 24 19 31 21 15 25 16 8 6 2 16 20 15 20 14 20 13 20 12 20 11 20 10 20 09 20 08 20 07 20 20 06 0

RF System of TLS (7) Oscillation of SRF module caused by LHe filling of an superconducting wiggler nearby.

RF System of TLS (8) Solution: Beam processing twice a year. (scanning the loading angle at high beam current)

RF System of TLS (9) Energy Saving on booster RF system

Operation Status of Taiwan Photon Source (TPS)

Recent Progress of TPS 2014 – July: 150 Me. V LINAC commissioning. – Dec. 16: Ramping electrons to 3 Ge. V in the booster ring. – Dec. 31: electron beam was firstly stored in the storage ring (5 m. A). 2015 – Feb. 9: Beam current up to 100 m. A (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 m. A (Decay mode). 2016 – – Mar. 24 ~ June 28: User mode operation (for beamline commissioning). May 26: 300 m. A top-up mode, for user operation. June 16: 400 m. A top up mode, for testing. Sep. 22~ Dec. 27: User mode operation.

TPS: Phase-I Accelerator Commissioning Up to 100 m. A (with two PETRA cavities)

TPS: Phase-II Accelerator Commissioning Up to 500 m. A (with two SRF modules) 350 m. A top-up mode

TPS: Beamline Commissioning 150 100% 140 96% 130 92% 120 88% 110 84% 100 80% 1 2 3 4 5 6 7 Week 8 9 10 11 12 Availability: 96. 2% in average Delivered user time (hour) Up to 300 m. A (with two SRF modules)

Operation Status of the RF System in TPS

100 -k. W RF System for TPS Booster Ring Ferrite Load and Circulator 100 -k. W transmitter LLRF PETRA Cavity

300 -k. W RF System for TPS Storage Ring SRF module SRF electronics LLRF 300 -k. W transmitter 300 -k. W klystron

Cryogenic Transfer System for TPS CVB 1 TL 3: 27. 1 m Spare Section CVB 2 TL 2: 30. 3 m SRF #1 DVB CVB 3 TL 4: 25. 4 m 700 -W Helium Cryogenic Plant 7000 -L Dewar TL 5: 26. 9 m SRF #2 CVB 4 Spare Section DVB : Distribution Valve Box CVB : Control Valve Box for SRF module TL : Multi-channel Transfer Line

Operation of the 300 -k. W RF System

Operation of the 300 -k. W RF System MTBF: 171. 4 hours in average MTBF [hours] 200 150 Cooling (1) 14% 100 50 RF (1) 14% 0 Mar-16 Apr-16 May-16 LLRF unstable (1) 14% 100% Availability TXM (3) 43% 99% 98% Human (1) 14% Number of Trip: 7 (2016 Mar. ~ May) Total failure time : 2. 22 hours 97% Mar-16 Apr-16 May-16

Summary • RF System in Taiwan Light Source – Nine IDs and one SRF module in this compact ring. – Great reliability of the 100 -k. W RF system. – Beam processing twice a year. • RF System in Taiwan Photon Source Ø Operation with greater power due to more insertion devices and higher stored current in the coming years. ü Design goal of 500 -m. A operation with bare lattice was examined. – Reliability to be improved. – Coupler conditioning and beam processing every week. – Digital LLRF in preparation.

Thank you for your attention.