Isamu Abe

The KEKB injector linac

Abstract An 8-GeV electron/3.5-GeV positron injector for KEKB was completed in 1998 by upgrading the existing 2.5-GeV electron/positron linac. The main goals were to upgrade its accelerating energy from 2.5 to 8 GeV and to increase the positron intensity by about 20 times. This article describes not only the composition and features of the upgraded linac, but also how these goals were achieved, by focusing on an optics design and commissioning issues concerning especially high-intensity single-bunch acceleration to produce positron beams.

New control system with VME and workstations for the KEK e−/e+ linac

Abstract A new control system has been introduced for the KEK electron/positron linac which comprises seven VME stations with the OS-9 operating system and UNIX-based workstations. All of the VME stations and workstations communicate with each other, using the TCP/IP protocol through an Ethernet connection. New control software has been developed with attention being paid to a smooth transition from the old control system. The new software provides transparent functions for controlling the basic accelerator components. The new system started operation in October, 1993.

Control system for the photon factory 2.5 GeV electron linac

Abstract The 2.5 GeV electron linac of the KEK Photon Factory is controlled by a distributed processor network composed of eight minicomputers and many microprocessors. Each individual linac equipment has autonomous operation capability with a micro-processor-based device controller. The device controllers are interconnected to six subcontrol stations and a main operators console through a fiber optic communication network; it is effective to prevent control system malfunction by strong electromagnetic noises arising from pulse operation of high-power klystrons. The system configuration and performance are described.

New pre-injector of the KEK 2.5-GeV linac and its performance

The injection system (pre-injector) of the KEK 2.5-GeV linac has been upgraded so that we can investigate intense beam acceleration for the KEK B-factory project. It requires intense beams to achieve a short injection time in practice. An outline of the new pre-injector and its performance is given.<<ETX>>

Multiple single-board-computer system for the KEK positron generator control

Abstract The KEK positron generator is controlled by means of a distributed microprocessor network. The control system is composed of three kinds of equipment: device controllers for the linac equipment, operation management stations and a communication network. Individual linac equipment has its own microprocessor-based controller. A multiple single board computer (SBC) system is used for communication control and for equipment surveillance; it has a database containing communication and linac equipment status information. The linac operation management that should be the most soft part in the control system, is separated from the multiple SBC system and is carried out by work-stations. The principle that every processor executes only one task is maintained throughout the control system. This made the software architecture very simple.

An operator-console system of the photon factory injector linac

Abstract It is sometimes difficult to unify accelerator control systems constructed in different ways. This problem arose in unifying the control systems of the injector linac and the storage ring making up the Photon Factory of the National Laboratory for High Energy Physics. One easy approach is to unify only the operator consoles; the unified console is connected to both separate control systems using gateways. The operator-console system of the Photon Factory injector linac has been designed and constructed using this approach. It consists of several workstations interconnected via a local-area network, a gateway to the old linac control network and a CATV system for the real-time display of the accelerator status. In this way the linac will be controlled from the control center of the Photon Factory storage ring.

Recent progress in the control system of the KEK 2.5 GeV e−/e+ linac

Abstract The KEK 2.5 GeV linac is controlled by a distributed processor network having minicomputers and microcomputers interconnected with fiber-optic networks. This system has operated for seven years; however, the system capability has become inadequate for the increasing demands. Thus a new network system, using the TCP/IP protocol suite over Ethernet, has been introduced. New control software to enable more reliable operation of the linac is now under development.