COMPENSATION OF THE BEAM VERTICAL DEFOCUSING AT THE EXIT OF U400 CYCLOTRON SPIRAL INFLECTOR

B.N. Gikalª, G.G. Gulbekyan, I.A. Ivanenko

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

The calculations and experiments on the beam dynamic at U400 cyclotron spiral inflector shows the presents of the vertical defocusing of the beam at the inflector exit. This leads to aperture losses of the beam at the cyclotron centre. In this present work the method of decreasing of the vertical defocusing effect of U400 cyclotron spiral inflector is presented. The decreasing of the vertical defocusing is achieved by means of special form of the inflector electric field. The calculations have shown the beam vertical envelope at the inflector exit has an appreciably smallest dimension and slope.

ª – corresponding author

Paper 

127

HEAVY ION CYCLOTRONS OF FLNR JINR – STATUS AND PLANS

B.N. Gikalª

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

Presently Flerov Laboratory of Nuclear Reactions of Joint Institute for Nuclear Research has four cyclotrons of heavy ions, U-400, U-400M, U-200, IC-100, which provide performance of the basic and applied researches. Total operating time of cyclotrons is about 8000 hours. The intensive beams of ⁴⁸Ca ions on the cyclotron U-400 have provided performance of the program on synthesis of a number of new isotopes of the superheavy elements. The Tritium beam with the energy of 19 MeV/nucleon and intensity of 10⁹ pps was accelerated on the cyclotrons U-400. The beams of ⁶He (28 MeV/nucleon) and ⁸He (25 MeV/nucleon) 10⁴ pps respectively were received in flight ×10⁵ pps and 3× with intensity 3 method using a thin Beryllium production target in the separation channel. The realization of the project DRIBs (Dubna Radioactive Ion Beams) based on ISOL scheme is completed at the Laboratory. It will allow increasing the intensity of the⁶He and ⁸He beams up to 10¹⁰ pps and 10⁸ pps respectively. The first physical experiment is being planned to carry out by the end of this year. Last years the modernization of IC-100 cyclotron was carried out. The task of modernization is acceleration of an intensive beam of Kr with energy about 1.2 MeV/nucleon that will be used for irradiation of deferent polymer materials. FLNR works on creation of the cyclotron DC-72 for Slovak cyclotron center in Bratislava are being conducted. The accelerator is developed for acceleration of protons with energy up to 72 MeV and heavy ions with energy from 3.5 up to 18 MeV/nucl. The first beam is being planned to obtain in 2005. Flerov Laboratory of Nuclear Reactions in collaboration with Nuclear physics Institute (Almaty) the cyclotron DC-60 for applied researches has been developed for the Research Center at L.N. Gumilev Euroasia State University in Astana (Kazakhstan). The cyclotron is capable to accelerate ions from Carbon to Xenon with energies 0.35÷1.67 MeV/nucl.

ª – corresponding author

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