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On the feasibility of using an extracted polarized antiproton beam of the HESR with a solid polarized target (continue) Presenters Yu. A. Plis, A.V. Smirnov PSTP2015, Bohum, Germany Urban model of beam energy loss n3 I E n1 I1 n2 I 2 i 1 1 g i Emax g Emax I n1, n2 – number of excitation events to different atomic energy levels n3 – number of ionization events – uniform random number N P/P0 Eloss P/P WASA@COSY experiment (momentum on time – no barriers) Burrier buckets reflect particles and keep inside barriers while momentum spread less than barrier height Example of moving barrier buckets TRE V0 V t TGAP p/p TR F s-s0 Burrier buckets compensate the effect of beam energy loss N no barriers: P/P0 P/P1 fast negative energy loss P/P Eloss N P/P1 P/P0 P/P barrier buckets momentum spread growths due to scattering process which is much slower than energy loss Simulation of particle interaction with pellets using BEATCOOL code http://betacool.jinr.ru Pellet flux For each particle s Find number of interaction events: 1) Integration over betatron oscillation 2) Integration over pellet flux 3) Number of turns per integration step A few interactions of each particle per integration step (about 0.1 - 1 sec) with realistic interaction models (Urban + plural scattering) x Ion beam profile Particle probability distribution over betatron oscillation Designed parameters for PANDA (high-luminosity mode) Momentum, GeV/c RMS momentum spread Transverse emittance (RMS normalized) 9 1·10-4 0,4 Average luminosity, cm-2 s-1 2·1032 Detector limit, cm-2 s-1 3·1032 Effective target density, cm-2 4·1015 Pellet velocity, m/s Pellet flux radius, mm 60 1,25 Pellet size (diameter), µm 28 Distance between pellets, mm 5 6 Effective luminosity simulation for different variants of detector limit Average luminosity Detector limit Detector can not count more than limit y Microstructure of luminosity on time Average luminosity Full overload of detector y Effective luminosity x 7 Luminosity on time Conclusion • BETACOOL simulations show that the pellet size should be much less than 28 µm which was accepted by PANDA community • Algorithms in BETACOOL code were especially elaborated for PANDA experiment and can be effectively used for the optimization of the beam extraction with the scattering on the different types of internal targets