A New High Performance Data Acquisition Systemand Application to a Betatron Oscillation Monitor
J.Kishiro1, S.Igarashi1, K.Nigorikawa1, Y.Takeuchi2, T.Toyama1, Y.Yamaguchi2 , T.Kondo3.
1 High Energy Accelerator Organization, Japan, KEK, 1-1 Oho Tsukuba, Ibaraki, Japan
2 Yokogawa Electric Corporation, Japan, YOKOGAWA, 2-3-9 Naka-machi, Musashino, Tokyo, Japan
3 Emac Corporation, Japan, EMAC, 4-19-11 Minami-tanaka, Nerima, Tokyo, Japan

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A new system of a betatron oscillation monitor in theKEK 12GeV proton synchrotron has been developed. System is a combination of a transverse beam kicker, betatronoscillation beam monitor and a fast data acquisition. Thecirculating beam is transversely kicked by a white noise
signal and a digitizer module acquires the detected oscillation signal and automatically FFT analyzed. Noise generator, power amplifier controller, fast digitizer etc. are installed in a separated powered chassis and connected eachother by employing an optical fiber network. Data acquisition system by a combination of plug-in-modules and chassis is newly developed by Yokogawa electric corporation[1] according to plug-and-play architecture.

several spectrums of the betatron oscillation side bands
around the revolution spectrum in order to obtain an efficient transverse kick. The amplitude of the beam kick is
controlled sufficient but as small as possible for detecting
the beam transverse oscillation without any degradation of
the beam quality[2]. Figure 2 shows the cross sectionalview of the beam kicker electrode.

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Abstract

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Figure 2. Cross sectional view of the beam kicker electrode.
The data acquisition modules are distributed in two powered chassis, one of which is placed in the accelerator control room and the other is in a satellite room. The chassis
and modules are new products and designed to have a dedicated protocol and architecture in order to realize the highspeed visualized data acquisition and control (details aredescribed in the following section). The system is connected to one of the 12-GeV accelerator control computer, inwhich WindowsNT is executing and all of the control anddata presentations are developed by Delphi-2. Figure 3
shows the control panel for this system.

Figure 1. System configuration.
1 Betatron oscillation monitor system.
The betatron oscillation monitor system consists of awhite noise generator, transverse beam kicker and fast dataacquisition modules. System configuration is depicted infigure 1.
Noise signal bandwidth is controlled so as to include theFigure 3. System control panel.
On the control panel, several control knobs are config-

ured to adjust the data acquisition timing, acquisition gain
and kicker power etc. The signal of the beam oscillation
monitor is automatically acquired and those are also automatically analyzed by means of a software fast Fouriertransformer (FFT). The software program looks for thefundamental revolution frequency and the betatron sideband around that. Thus the betatron tune is automaticallydisplayed on the panel. A typical example of the display ofthis monitor system is depicted in figure 4.

system, which is basically a PC base network data acquisition system distributed some powered chassises (calledStation) and those are interconnected by employing two
optical fibers. Yokogawa also develops a dedicated protocol for WE7000 (WE-Link) and, by this protocol, all of thecontrols both for the station and for the modules are realized.
This system is composed of some (maximum 127) powered chassis (stations), control/acquisition computers andoptical fiber network. The optical fiber network has a large
capacity to transfer the data rate of up to 250Mbps andconnected by the chain style. The station has four or eightslots in which any kind of modules, such as digital scope
module, digital/analogue I/O modules, function generator
modules etc., are installed (as shown in figure 5). And thestation itself is equipped a RISC micro processor chip bywhich the network and station bus control are handled. ThisRISC computer automatically compresses data taken bysome modules so that the network load is easy to reduce.
Also some pre-processor software is possible to down load
into this RISC computer.

Figure 4. Monitor display.
Analyzed spectrum and automated tune display are shown.
The system development is completed. This system enables an automatic betatron tune measurement and continuously operated on the accelerator console.
2 New data acquisition system
For the betatron oscillation monitor system the followings are requested:a. 100k word data should be acquired and analyzed during the accelerator operation period of 4s.
b. Control and data presentation panel should be developed by only employing GUI builder software.
c. The system should have device or module independentarchitecture.
d. The system components can be distributed by an optical fiber network.
In addition, KEK has now a new project of a high intensity proton synchrotron called JHF (Japan Hadron Facility).
For an accelerator control and data acquisition, KEK isinvestigating the available interface hardware. JHF has arapid cycle accelerator (25Hz repetition rate) so that themost serious requirement is the fast and large amount ofdata transfer on the control network. And a control panel
should be easy to develop by employing a user friendly
visual objectives.
We take a WE7000 system for the betatron oscillation
monitor and reliability test for the new accelerator control
is undergoing.
WE7000 is a newly developed by Yokogawa electric Corporation [1] intending to an extremely fast data acquisition

Figure 5. WE7000 station.
From left, station power supply and RC232C interface, optical fiber network in/out and four modules.
One of the excellent features of this system is that the individual driver software is already implemented in themodule itself, and the installation of the module concerned
is automatically recognized according to the plug-and-playarchitecture. This driver software is not only the hardwareinterface software but also includes the visual interface.
Thus a user is free from the control and display software
coding.
Some API (application program interface) are also supplied by Yokogawa so that any kind of control/acquisition
program is easy to develop. A typical system configuration

is a chain style multi station as shown in figure 6.

Figure 7. Multi chain, multi station.

Figure 6. Single chain multi station configuration.
Not only a single chain but also a multi chain connection
is possible through the computer network by the Ethernet
etc., one of an example is shown in figure 7.
3 Conclusion

dynamically changed. And the beam degradation by the
kick is unobservable. Automate tune measurement provides
very efficient tool to study the beam dynamics during theacceleration.
The development of a new fast measurement system wastested of its reliability and feasibility by adopting it to thebetatron oscillation monitor. The architecture of WE7000
hardware and software were examined from the viewpointof accelerator control, and provides excellent performances.

A betatron oscillation monitor has been successfully de-References
veloped and continuously operated during any period of[1] Yokogawa Internal report.
acceleration. The beam is transversely kicked by a white[2] Toyama, private communication.
noise signal, which is extremely sufficient to excite thebeam betatron oscillation even when the betatron tune is