1. Status of BEPCII Timing System Presented by Ge Lei IMAC 2006

2. Progress Ordered hardware have all arrived and been tested. Besides, we have developed some hardware to fit our special requirements. Prototype of trigging E-Gun, linac modulators, injecting kickers have been set up based on EVG/EVR series 200 modules and TD4V. Software has been developed. Timing system has been installed in BEPCII Linac accelerator, in real operation, working well. Jitters have been measured, in both office and Linac control site. Challenges faced and solved: mis-trigs, missed trigs Challenges facing: bucket selection, work with BCM, etc.

3. Layout of BEPCII Timing System RingLinac E4434B, 499.8MHz EVG-200 Timing station Ring control room e+ RF station e- RF station spectrometer transmission line E4428C In linac control room 250m PLL transmission line To beam instrumentation station e gun OM3 optic fiber EVR-200, Gun-TX in room 102 trigger e- kicker e+ kicker OM3 multimode optic fiber OM3 optic fiber EVRs to trig modulators North West

4. BEPCII timing sequence

5. Timing prototype based on E4434B, MVME5100, EVG-200, EVR-RF-200, EVR-200, TTB, FOUT7, GUNTX, GUNRX, TTL-NIM transition board, TD4V

6. Linac timing works Hardware developed –220volts to 3.8volts transmitter for EVG, –12v output transition board for SolidAmplifier, –18 sets of optical transimitting/receiving boards, for gun power supply, positron source, and 16 modulators –Gun-Rx module changed to generate NIM outputs directly, Software developed, –Debug register settings for EVG-, EVR-200, TD4v, Gun-Tx –IOC database and OPI to test EVG-200,EVR-200,TD4v,Gun-Tx –EVG/EVR FPGA upgraded, tune EVRs –IOC database and OPI for linac timing operating, including BI –Applications to record arriving time of trigs in order to analyze the missed trigs –Functions added to drivers to set EVG/EVR registers to work at 499.8MHz/4, /5, /10

7. Linac timing works The fibre optical cables were installed in linac acce. site in Jan. On Feb.15,2006, we began moving our timing devices from office to linac control site, – install modules, connect cables, settle network, test applications, measure jitter –on Mar.1, we went to tunnel and installed GUN-RX in the high voltage deck, successfully set the trigs to e- gun. Work whenever linac people need us for the linac commissioning, to adjust timing delay settings of trigs to e-gun, solid amplifier, PSK, gun power supply, positron source, 16 modulators.

8. Linac Timing

9. Timing devices in linac control room

10. Timing devices in linac control room, backplane of the linac main timing crate

11. Gun-Tx, Gun-Rx, isolation transformer, regulated power supply

12. Linac timing works Problem suffered: (hope our experience in linac can do some helps to storage ring) –Unexpected power down, –Unexpected network down –EMI Challenge faced (solutions found) –Mis-trigs –Missed trigs Improving graphical user interface Phase shift due to temperature changing has been measured in March

13. Linac control panel, popped up when operators login

14. Linac timing control for positron source, e-gun power supply, PSK, solid amplifier, and 16 modulators.

15. E-Gun timing control

16. Jitter Measurement Use histogram and Jitter3AnalyserEssential seperately, to measure Pk-Pk StdDev: Standard Deviation ：

17. Jitter Measurement results Signal source: Agilent E4434B Measure Equipment: Tektronics TDS7254B oscillator Result: E-Gun trig to 499.8MHz signal source, standard deviation of jitter –at office: 36ps –at linac control site: 47ps The above data include the jitter of power divider, event generator, fanout module, event receiver, gun trig transmitter, gun trig receiver, TTL-NIM transition board and all cables.

18. Jitter measured using Jitter3AnalyserEssential, output of TTL- NIM transition board to 499.8MHz from signal source, at office

19. Phase detector designed by Zhenhan Ma, almost done. Resolution is less than 1 degree in scope from -180 degrees to 180 degrees of 1MHz signals

20. Acknowledgement Many thanks to colleagues and leaders in Acce.Center, especially in Linac system and Beam Instrumentation group. Many thanks to timing people in SLS, Diamond Light Source, SSRF and MRF. Many thanks to the collaboration in timing task of BEPCII: Preliminary design: W.Gao Interface discussing and Hardware ordering: W.Gao, G.Xu, G.Lei Prototype development, jitter measurement and analysis: G.Lei, G.Xu Hardware development: L.Wang, G.Li, Q.Le, W.Gao, G.Xu Software development: G.Lei, G.Xu Linac timing installation, debugging: G.Lei, G.Xu, W.Gao, Q.Le, Q.Ye, L.Wang Solaris, EPICS and vxWorks system support: Z.Zhao, C.Wang Phase detector: Z.Ma

21. Thank you