TUAP025 (Poster)

Presenter: Tatiana Salikova (Institute of Nuclear Physics)
email: Salikova@inp.nsk.su
Review Status: Proceedings Ready - 02/21/02
FullText: pdf
Eprint: physics/0111038

FEL injector control system on the base of EPICS

T.V. Salikova, A.A. Kondakov, G.Ya. Kurkin, A.D. Oreshkov, M.A. Sheglov, A.G. Tribendis.

The control system of the 1.5 Mev FEL (Free Electron Laser) injector is built on the base of ported EPICS (Experimental Physics and Industrial Control System)[2]. It uses low-cost hardware: personal computers (Intel x86) and CAMAC equipment produced by our institute. The distributed control system includes the OPerator Interface (OPI) and two IOCs (Input Output Controllers) under supervision of the real time operating system LynxOS/x86 at the lower level. Each IOC is used for monitoring of autonomous parts of the injector. The first IOC operates Radio Frequency (RF)system. The second IOC operates the gun, by currents in solenoids and steering magnets, and diagnostic equipment. The RF system contains one bunching cavity and two accelerating cavities of injector and includes also 16 accelerating cavities of the microtron. The cavity has 2 contactless fundamental mode frequency tuners (180.4 MHz) and 2 high-order mode tuners (the frequency tuning range is 320 KHz). The IOC of the RF system controls work of all the cavities and RF-feeding generators. It also can run OPI functions for adjustment of the equipment. The IOC of the gun operates the electrostatic gun, which emits electron bunches of a 0.1-1.5 nsec duration with a 2-22.5 MHz repetition rate. Power of a bunch reaches 300Kv at the exit from the gun. Further, the electron bunch is accelerated by RF cavities up to 1.5Mev. The IOC of the gun controls the magnetic system of the injector, which consists of a solenoid lens and steering magnets. The equipment for beam diagnostics is connected to the gun IOC. The OPI provides control panels for operation of the RF system, current of the gun, and monitoring of the electron optical system. To reduce ethernet traffics, all EPICS computers are connected to a private segment that supports all output traffic and limits input traffic.
[1] N.A. Vinokurov, Status of Novosibirsk high power free electron laser, Proceedings of AFEL-99, June 8-10 1999, Korea Atomic Energy Research Institute, Taejon, Korea pp7-12.
[2] Official site of EPICS collaboration. http://www.anl.aps.gov/epics
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