The Operation Logbook System at Kekb Linac and Ring

A relational database system Oracle was installed in the KEKB accelerator control system. The database contains all the data concerning accelerator components such as magnets, power supplies, vacuum ducts, pumps, control modules and so on. It keeps the history of the equipment, parameters of the component, physical location, electrical characteristics, wire connection list and so on.

2000

In the commissioning of KEKB 8GeV / 3.5GeV linac the accelerator control system was much improved, since reliable operation of the linac is indispensable to achieve the higher luminosity at the ring. Many controllers were installed to manage newly in- stalled accelerator equipment and beam instrumentation. Parts of the optical FDDI/Ethernet network system and the main computer system were made

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003

The KEKB accelerator control system including a control computer system, a timing distribution system, and a safety control system are described. KEKB accelerators were installed in the same tunnel where the TRISTAN accelerator was. There were some constraints due to the reused equipment. The control system is based on Experimental Physics and Industrial Control System (EPICS). In order to reduce the cost and labor for constructing the KEKB control system, as many CAMAC modules as possible are used again. The guiding principles of the KEKB control computer system are as follows: use EPICS as the controls environment, provide a two-language system for developing application programs, use VMEbus as frontend computers as a consequence of EPICS, use standard buses, such as CAMAC, GPIB, VXIbus, ARCNET, RS-232 as field buses and use ergonomic equipment for operators and scientists. On the software side, interpretive Python and SAD languages are used for coding application programs. The purpose of the radiation safety system is to protect personnel from radiation hazards. It consists of an access control system and a beam interlock system. The access control system protects people from strong radiation inside the accelerator tunnel due to an intense beam, by controlling access to the beamline area. On the other hand, the beam interlock system prevents people from radiation exposure by interlocking the beam operation. For the convenience of accelerator operation and access control, the region covered by the safety system is divided into three major access control areas: the KEKB area, the PF-AR area, and the beam-transport (BT) area. The KEKB control system required a new timing system to match a low longitudinal acceptance due to a low-alpha machine. This timing system is based on a frequency divider/multiply technique and a digital delay technique. The RF frequency of the KEKB rings and that of the injector Linac are locked with a common divisor frequency. The common divisor frequency determines the injection timing. The RF bucket selection system is also described. r (T. Katoh).

Fusion Engineering and Design, 2010

During the commissioning of the KSTAR device, electronic logbook has been developed to record participant's opinions regarding experimental procedures and results. The experimental logbook, a kind of the electronic logbooks inserts principal experimental parameters by itself and gets the experimenter's comments. Since it usually takes long time to surf around raw experimental data, a summarized comment on the experimental logbook helps physicists to analyze the results. The operation logbook, the other part of electronic logbook records history about system's abnormal, including their management history. Records on the operation logbook for components provide the criteria to validate the device's stability and the basis to complement the device operation procedure. Since a large majority of readers is interested in the information on the electronic logbook, the data is manipulated to be searched and read on the web-site which is accessible by the authenticated users. The web-site also includes a formatting function to report the logbook data as a document using Java Document Object Model (DOM) and Java Simple API for XML (SAX) API. Because there were difficulties to make an action scenario on the events due to insufficient experience of takamak operation, it was developed in parallel during the commissioning. By training operators to write comments on every detail of the experimental results and operation events, it could be more valuable data source for the next experiments.

2001

As an accelerator control system survives over several years, it is often the case that new subsystems are introduced into the original control system. The control system for the KEK electron/positron injector-linac has been using Unix workstations and VME computers since 1993. During the eight-year operation, we extended the system by introducing a) Windows PCs, b) PLC controllers with a network interface, and c) web servers based on modern information technology. Although such new subsystems are essential to improve control functionalities, they often cause communication problems with the original control system. We discuss the experienced problems, and present our solutions for them.

Progress of Theoretical and Experimental Physics, 2013

KEKB has completed all of the technical milestones and has offered important insights into the flavor structure of elementary particles, especially CP violation. The accelerator control system at KEKB and the injector linac was initiated by a combination of scripting languages at the operation layer and EPICS (experimental physics and industrial control system) at the equipment layer. During the project, many features were implemented to achieve extreme performance from the machine. In particular, the online linkage to the accelerator simulation played an essential role. In order to further improve the reliability and flexibility, two major concepts were additionally introduced later in the project, namely, channel access everywhere and dual-tier controls. Based on the improved control system, a virtual accelerator concept was realized, allowing the single injector linac to serve as three separate injectors to KEKB's high-energy ring, low-energy ring, and Photon Factory, respectively. These control technologies are indispensable for future particle accelerators.

About 90 stripline-type beam position monitors (BPM) have been installed for the KEKB e-/e+ injector-linac. A data acquisition system for the BPM has been developed. It is comprised of two Unix workstations and eighteen ded- icated front-end systems (VME computers and digital os- cilloscopes). The BPM waveforms, detected by a digital oscilloscope, are analyzed by a VME computer, then the calculated beam parameters (beam current, x-position, y- position) are transferred to workstations using the UDP protocol. The workstations are used as data servers for client applications. The present data acquisition system en- ables a real-time indication of the beam parameters over the whole linac.

2015

The KEKB accelerator control system including a control computer system, a timing distribution system, and a safety control system are described. KEKB accelerators were installed in the same tunnel where the TRISTAN accelerator was. There were some constraints due to the reused equipment. The control system is based on Experimental Physics and Industrial Control System (EPICS). In order to reduce the cost and labor for constructing the KEKB control system, as many CAMAC modules as possible are used again. The guiding principles of the KEKB control computer system are as follows: use EPICS as the controls environment, provide a two-language system for developing application programs, use VMEbus as frontend computers as a consequence of EPICS, use standard buses, such as CAMAC, GPIB, VXIbus, ARCNET, RS-232 as field buses and use ergonomic equipment for operators and scientists. On the software side, interpretive Python and SAD languages are used for coding application programs. The pu...

1998

About 90 stripline-type beam position monitors (BPMs) have been newly installed in the KEKB injector linac. These monitors easily reinforce handling beam orbits and measuring the charge of single-bunch electrons and positrons which are injected to the KEKB rings. The design value of the beam position resolution is expected to be less than 0.1 mm. A new data-acquisition (DAQ) system has been developed in order to control these monitors in real time. The hardware and software of 18 front-end computers were tuned for the linac commissioning. This report describes the hardware and software system, the monitor calibration, and preliminary beam test results. FIGURE 5. Variation of the beam orbits and charge intensity along the linac. The beam current of the single-bunch electrons is 10 nC/bunch.

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366), 1999

ANKA [1] is a 2.5 GeV synchrotron radiation light source being built in Karlsruhe, Germany. The control system for the accelerator is based on the three-tier standard model architecture. However, modern products based on standards in distributed objects and networking are applied in addition to low-cost hardware including PCs. We use the LonWorks field bus network with intelligent nodes and standard I/O modules to connect the individual devices directly to PCs that run device servers under Windows NT. Those PCs act as WWW servers for data transmission, application distribution and documentation retrieval. Applications in the control room run also on Windows NT hosts as WWW clients. However, they could run in any Web-browser on any platform, because all operator control is performed through a Web-browser with Java applets/applications. The communication with the control system data servers is done through CORBA. CORBA objects are wrapped in JavaBeans which are simply connected with commercial data-manipulation and visualization Beans into full-fledged applications or applets. First experiences with this control system during the operation of the ANKA microtron are presented.