Post on 31-Dec-2015
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.
Layout of BEPCII Timing System
Ring Linac
E4434B, 499.8MHzEVG-200
Timing stationRing 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 gunOM3 optic fiber
EVR-200, Gun-TX in room 102
trigger
e- kicker
e+ kicker
OM3 multimode optic fiber
OM3 optic fiberEVRs to trig modulators EVRs to trig modulators
North
West
BEPCII timing sequence
Tri g toModul ator1
Tri g toSol i d
Ampl i fi er
Tri g to PSK
Tri g to E-Gun
Modul atorOutput
Sol i dAmpl i fi er
Output
4us
4. 5us
2us
0. 83us
Tri g to Ki cker1
1. 5usKi cker1 ThyratronOutput
Timing prototype based on E4434B, MVME5100, EVG-200, EVR-RF-200, EVR-200, TTB,
FOUT7, GUNTX, GUNRX, TTL-NIM transition board, TD4V
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
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.
Linac Timing
MVME5100
GUN-TX
EVR-RF
Agi l ent E4434BSi gnal Generator
MVME
5100
EVR-
RF
EVG
FOUT-7
Li nac Control Room
EVR-RFI OC
EVR-RFEVR-RF
Room 102
GUN-
RX
TTL
-NIM
Puls
er 1
Puls
er 2
NI M Crate
E-GUN hi ghvol tage deck
Li nac Modul ator Gal l ery
PSK Sol i dAmp
K1K16 . . . . . .K11
K12
K13
K14
K15
K10
K2K3K4K5K6K7K8K9
GunP
S
E+so
ur
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
Linac timing control for positron source, e-gun power supply, PSK, solid amplifier, and 16 modulators.
Jitter Measurement
Use histogram and Jitter3AnalyserEssential seperately, to measure
• Pk-Pk• StdDev: Standard Deviation:
n
iixn
x1
1
n
ixxin
StdDev1
2
)(1
1
Jitter Measurement results
Signal source: Agilent E4434BMeasure Equipment: Tektronics TDS7254B oscillatorResult: E-Gun trig to 499.8MHz signal source, standard dev
iation 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.
Jitter measured using Jitter3AnalyserEssential , output of TTL-NIM transition board to 499.8MHz from signal source, at office
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
AcknowledgementMany 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