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 

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