Status of bepcii timing system
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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.

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Status of BEPCII Timing System

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Status of bepcii timing system

Status of BEPCII Timing System

Presented by Ge Lei

IMAC 2006


Progress

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

West

North

e+ RF station

e+ kicker

To beam instrumentation station

EVRs to trig modulators

EVRs to trig modulators

OM3 optic fiber

OM3 optic fiber

e gun

transmission line

250m PLL transmission line

E4434B, 499.8MHz

EVG-200

Timing station

Ring control room

trigger

spectrometer

E4428C

In linac

control room

OM3 multimode optic fiber

EVR-200, Gun-TX

in room 102

e- kicker

e- RF station

Ring

Linac

Layout of BEPCII Timing System


Bepcii timing sequence

BEPCIItiming sequence


Status of bepcii timing system

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

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 works1

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

Linac Timing


Timing devices in linac control room

Timing devices in linac control room


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

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


Gun tx gun rx isolation transformer regulated power supply

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


Linac timing works2

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 control panel, popped up when operators login


Linac timing control for positron source e gun power supply psk solid amplifier and 16 modulators

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


E gun timing control

E-Gun timing control


Jitter measurement

Jitter Measurement

Use histogram and Jitter3AnalyserEssential seperately, to measure

  • Pk-Pk

  • StdDev: Standard Deviation:


Jitter measurement results

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.


Status of bepcii timing system

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


Status of bepcii timing system

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


Acknowledgement

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


Status of bepcii timing system

Thank you


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