Kostromin, S.A.
CORRECTION OF THE CYCLOTRON RIC-30 MAGNETIC FIELD |
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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 |
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ISOCHRONOUS CYCLOTRON C250 FOR PROTON THERAPY APPLICATION |
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Yu.G. Alenitskyª, S.B. Vorozhtsov, A.S. Vorozhtsov, A.A. Glazov, N.L. Zaplatin, S.A. Kostromin, G.A. Karamisheva, L.M. Onischenko Joint Institute for Nuclear Research, Dubna, Russia Abstract Dubna scientific medicine center is under development since 1967 on the base of the proton beam of LNP JINR Phazotron. Proton beam with energy Åð~170 MeV and intensity I~0.1 μA is used for patients irradiation. Proposal of the cyclotron with the same beam characteristics was reported earlier at the RUPAC04 [1], ICAA05 [2], RUPAC06 [3] and printed in magazine [4]. New project of C250 – cyclotron for proton therapy is considered in this paper. Energy of the extracted beam increased according to last medical requirements up to 250 MeV. 4-fold and compact types of magnet yoke were studied by 3D computer magnetic field calculations. The ability of optimal combination of the magnet yoke, HF and extraction systems of the cyclotron taking into account the dynamics of the proton beam in calculated magnetic and accelerating field is under discussion. ª – corresponding author |
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