Status of BEPCII Timing System

Presented by Ge Lei

IMAC 2006

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

Timing devices in linac control room

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

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

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 control panel, popped up when operators login

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

E-Gun timing control

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

Thank you