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P.48. E.A.Bekhtenev, E.N.Dementev, S.M.Gurov, G.V.Karpov, P.V.Logatchev,A.S.Medvedko (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

BEAM POSITION PREINJECTOR

MEASUREMENT

SYSTEM

IN

VEPP-5

A new beam position measurement (BPM) system has been designed, manufactured and tested in VEPP-5 preinjector. This system measures position of single electron and posi- tron bunches for each injection cycle with help of stripline pickups. New BPM electronics provides more high sensitivity with respect to existing one developed in 1998. The system can measure the position of bunches with 108 particles per bunch. The whole dynamic range is from 108 to 5*1010 particles per bunch. The resolution of measurements of single bunch is better than 20 microns for 1010 particles per bunch. The features of system de- sign, the main parameters and results obtained in VEPP-5 preinjector are presented.

Dr. Gennady Viktorovich Karpov: karpovg@inp.nsk.su

P.49. S.E.Karnaev, M.Khelik, M.V.Kollegov, V.R.Kozak, E.A.Kuper, A.N.Selivanov (Budker Institute of Nuclear Physics, Novosibirsk, Russia)

Intelligent digital to analog converters for VEPP-4M magnetic system.

VEPP-4M collider has been worked since 80th. Growing expenses for maintenance of ob- solete electronics make us to conduct a number of modernization programs. The problem is in keeping of facility in operating state during modernization process. To achieve it we have decided to implement new electronics on modern components but pin-to-pin and bit- to-bit compatible with obsolete prototypes. It allows keeping intact software and replacing old equipment by hidden way. There were described two of these new devices. They are intelligent multichannel DACs for controlled power supplies. VEPP-4M includes ap- proximately 300 power supplies for bending magnets and steering coils controlled by these devices. One device provides 16 channel of DAC with resolution 16 bit and accu- racy better than 0,01%. The second device is intended for precise power supplies for bending magnets and provides resolution 20 bits and accuracy up to 0,001%. The paper covers different aspects of design and resolved problems and shows achieved results.

Arkady Nikolaevich Selivanov: A.N.Selivanov@inp.nsk.su

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