introduction

Fast BPM DAQ System Using Windows Oscilloscope-based EPICS IOCM. Satoh, T. Suwada, K. Furukawa

Accelerator Laboratory, KEK, Oho 1-1, Tsukuba, Ibaraki, 305-0801 JapanJian Wang

Department of Modern Physics, Univ. Sci. & Tech. ChinaHefei 230026, ChinaT. Kudou, S. Kusano

Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan

Introduction

・ KEK Linac is a injector:(1) KEKB HER 8 Gev e-/ 3.5 Gev e+ (Continuous injection Mode: CIM)(2) KEKB LER 3.5 GeV e+ (CIM)(3) PF 2.5 Gev e- (once/day) => Top-up(4) PF-AR 3 GeV e- (twice/day)・ For long-term stable beam operation:Needs Beam Orbit and Energy ControlWe use about 100 of non-destructive BPMs for the orbit

and energy feedback.

・ Fast Beam-Mode Switch for KEKB CIM and PF Top-up=> Needs Beam Position Measurement up to 50-Hz

Result of Performance Test

Summary

• New BPM DAQ System has been developed by a fast digital oscilloscope (Tektronix DPO7104)•All DAQ Systems have been replaced by New Systems•Performance of New DAQ System is enough for 50-Hz measurement.

VME#2 VME#20

BPM Data (x,y,i, ...)

VME#1

Sharedmemory

Oscillo. data(V-range,etc.)

Waveform read-out from oscilloscope Data processing O sc illo sco p e

co n tro l

Write Read

send recvRead Write

UNIX server

recv send

UDP protocol

Sharedmemory for #1 for #20for #1 for #20

Write Read

UNIXWindows/PCLinux/PCTouch-terminal

BPM Application BPM

Application

BPM Application

Write

Read

Read

Tcl/Tk, Python, Visual Basic......

TCP protocol

BPM DAQ Software Structure

0 2 4 6 8 100

50

100

150

200

250

300

350

DA

Q r

ate

[Hz]

Number of data points [k]

1ch 2ch 3ch 4ch

Local access

0 2 4 6 8 100

50

100

150

200

250

300

350

DA

Q r

ate

[Hz]

Number of data points [k]

1ch 2ch 3ch 4ch

Remote access (Ethernet/ VXI-11)

Waveform acquisition speed of a fast digital oscilloscope was tested. (Remote/ Local test: Software is running on host computer/ oscilloscope)

Both test results is enough for our purpose (50-Hz measurement).

DAQ Rate by EPICS-IOC is also enough fast.

VME

Oscilloscope

Cable Combiner BOX

Previous BPM DAQ System (1-Hz)

Monitor Station

Cable Combiner Box

Linac Tunnel

Klystron Gallery

BPM

8ch-Combiner 8ch-Combiner

*

* Delay Cable (7-ns)

Digital Oscilloscope (5GS/s)

y x GPIB

VME/ OS9

Linac NetworkMonitor Station

Cable Combiner Box

Linac Tunnel

Klystron Gallery

BPM

8ch-Combiner 8ch-Combiner

*

* Delay Cable (7-ns)

Fast Digital Oscilloscope (10GS/s)y x

Linac Network

Windows XP

EPICS

New BPM DAQ System (> 50-Hz)

EPICS Record Design by VDCT

•Development of IOC for beam operation•Development of Device Support including all Oscilloscope Functions• Realization of Synchronized Beam Orbit Measurement among all twenty-five DAQ Systems

Future Issue

50 100 150 200 250 300 350 400 450 5000

50

100

150

200

250

300

350

DA

Q S

pe

ed

[Hz]

Data length[k-points]

Ch4 Ch3 Ch2 Ch1

DAQ Performance by EPICS-IOC

Replaced!Replaced!