#127(M5)Fast BPM data acquisition system using WindowsXP-based EPICS IOC
M. Satoh, T. Suwada, K. Furukawa
Accelerator Laboratory, KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, JapanY. Hu
Brookhaven National Laboratory, Upton, New York 11973, USA
T. Kudou, S. Kusano
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Ibaraki 305-0045, Japan
Performance test of the fast digital oscilloscope

Overview!We tested the speed of waveform acquisition (Tektronix• KEK Injector Linac provides four different kinds of beam
• 8 Gev e- (1 nC)/ 3.5 Gev e+ (1 nC, primary e- 7 nC)
for KEKB (Continuously)• 2.5 Gev e- (0.1 nC) for PF (Scheduled Injection 2/day)

DPO7104, 4CH, WindowsXP, Pentium4-3.4 GHz, 2 GB memory) forthe local and remote access. In the local access test, the test
software is running on the oscilloscope.
!The test result shows that the acquisition speed is enough for
50-Hz measurement.
!In the practical operation, we need 2-k data length w/ 2CH.

=> Top-up (Autumn ’09)
• 3 GeV e- (0.1 nC) for PF-AR (Scheduled Injection 2/day)

300

Former BPM DAQ system: Old digital oscilloscope/GPIBand VME. The maintenance work is very difficult since
the oscilloscope is discontinued product.

3002502001502502001501001005050002468
Number of data points [k]

1ch
2ch
3ch
4ch

Remote access (Ethernet/ VXI-11)

350

DAQ rate [Hz]• Towards KEKB continuous injection/ PF Top-up! We need BPM data acquisition of 50-Hz

1ch
2ch
3ch
4ch

Local access

350
DAQ rate [Hz]• Non-destructive Beam Position Monitor (BPM)• used for Beam orbit feedback/ Beam energy feedback• Number of BPM: 94 (four strip-line type electrode)

0100246810

Number of data points [k]Beam Orbit panel examples! New system: Fast digital oscilloscope (Windows XPbased) w/ EPICS (Experimental Physics and IndustrialControl System)

New BPM System

Digital Oscilloscope (5GS/s)

Fast Digital Oscilloscope (10GS/s)yx

VME/ OS9x

Linac Network

EPICS
Windows XP

GPIB

Cable Combiner Box

Cable Combiner Box
8ch-Combiner

8ch-Combiner

8ch-Combiner

K E K B e+ m ode(p r im a r y e - 7 n C )K E K B e- m ode(e - 1 n C )PF m ode( e - 0 .1 n C )8ch-Combiner
Time [ms]**20 ms (50 Hz)

352hours

30

Linac Tunnel

Linac Tunnel

20 ms (50 Hz)

40Klystron Gallery

Klystron Gallery

25* Delay Cable (7-ns)* Delay Cable (7-ns)

BPM

BPM

Time
inter
valbetweenbeamshot[ms]yMonitor Station

Linac Network

201
510

10ms(Window
stimestampgr
anularity)

500100000 200000 300000Beamshotnumber

VME

Beam charge [nC]

Monitor Station

Beam Test with 50 Hz repetition
B eam charge [nC ]Former BPM System

20 ms (50 Hz)

109876543210

KEKB e+ mode
KEKB e- modePF e- mode

2 hours

030000

60000

90000

Beam shot number

Summary and planning• The new BPM DAQ system was developed for
the KEK Injector Linac.
•This system is the WindowsXP-based fast digital
oscilloscope. Each of them can work as a EPICS.
•All of 23 BPM-DAQ systems have been alreadyPhotograph of Fast Digital Oscilloscope replaced by new one, and used for daily(Tektronix DPO7104)
operation.
•They all work very stable.

Oscilloscope

Cable Combiner BOX
Photograph of Former System•EPICS record for the averaging data is underdevelopment.
•Same system is now being prepared for theKEKB-BT.

120000