CORRECTION OF THE CYCLOTRON RIC-30 MAGNETIC FIELD

Yu.G. Alenitckyª¹, E.V. Samsonov¹, A.F. Chesnov¹, S.A. Kostromin¹, D.V. Emeljanov², V.G. Kaplun², A.G. Suzikov², C.V. Jagolnikov², B.I. Rogozev³

¹Joint Institute for Nuclear Research, Dubna, Russia

²Second Central Scientific Research Institute, Military Defense of Russian Federation, Tver, Russia

³Federal State Unitary Enterprise Research-And-Production Association V.G. Khlopin Radium Institute, Saint-Petersburg, Russia

Abstract

Cyclotron RIC-30 (development of SPA "D.V. Efremov Scientific Research Institute of Electrophysical Equipment" is in operation from 1993. RIC-30 is isochronous cyclotron with sector's focusing and one-dee (180 degree) RF system. Compact magnet has 150 cm pole diameter. Cyclotron is used for the production of the PET-isotopes using internal and extracted beam with maximal energy of protons ~28 MeV. At earlier periods of exploitation some parameters of cyclotron (beam intensity and energy) were in disagreement with designed ones. It was decided to carry out the magnetic field measurements to understand the causes of such misalignment. This was done in 2006.

The results of the magnetic field measurements as well as dynamics characteristics of the accelerated beam are presented in the paper. Central steel plug with one unsymmetrical hole for the ions source was replaced by the same one with two symmetrical holes. The new plug doesn't cause a presence of the 1st harmonic of the magnetic field in the cyclotron center. This leads to the beam energy grow up at the extraction radii due to decrease of the coherent amplitudes in the accelerated beam. Change of the magnetic field parameters in the cyclotron center for the beam intensity increase is under discussion as well.

ª – corresponding author

Paper Slides

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