ICAP 2002 Abstracts and Posters
The Computer Simulation of a Resonance Behavior of Particles in Synchrotron at a Slow Extraction Process.
Abstract
Technique and results of the computer simulation of process of electron beam extraction from the Synchrotron "Pakhra" are presented. Electrons can be extracted from the synchrotron at energy in the range 200 - 850 MeV. The extraction procedure is based on the excitation of the horizontal betatron oscillations on a fourth order nonlinear resonance. Required resonant conditions are fulfilled by two pole face windings. The gradient winding brings the index of the magnetic field from the working value 0.51 to resonant one 0.63. The necessary third azimuthal harmonic of the cubic nonlinearity of the magnetic field is forming by the octupole winding. The extraction system of the synchrotron "Pakhra" contains two pulsed septum magnets. They are located inside the synchrotron vacuum chamber. Analysis of electrons trajectories was perfomed in phase space at septum magnets azimuths. Dependences of the betatron amplitudes resonance growth were obtained. The method of the optimal tuning of the slow extraction system was developed. The proper position and alignment of septum magnets were found.
Yu. A. Bashmakov, V.A. Karpov
P.N. Lebedev Physical Institute, Leninsky Prospect 53, Moscow 117924, Russia
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