Erarbeitung analytischer Zusammenhänge zur Beschreibung polarisierter Teilchenstrahlen in Beschleunigern und deren Anwendung auf das Kühlersynchrotron COSY
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Titel:
Erarbeitung analytischer Zusammenhänge zur Beschreibung polarisierter Teilchenstrahlen in Beschleunigern und deren Anwendung auf das Kühlersynchrotron COSY
Erschienen in:Jülich : Forschungszentrum Jülich GmbH Zentralbibliothek Verlag, Berichte des Forschungszentrums Jülich 2754, 120 p. (1993).
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Deutsch
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Beschreibung:
Experimental data from nuclear physics experiments show the need for polarized particle beams. But the conservation of polarization in accelerators is a delicate andextraordinary topic . Only few accelerators in the world can accelerate polarized particle beams. During acceleration spin resonances have to be crossed. This resonance crossing will leed to undesired polarization losses. There have been developped different sceems to avoid these losses. In the Cooler Synchrotron COSY it is intended to accelerate polarized proton beams. Therefore it is quite urgent to find out the best sceems for polarization conservation in COSY. For intrinsic resonances the tunejump method is appropriate for COSY. For imperfection resonances different sceems of closed orbit correction and a partial snake concept using the electron cooler of COSY are discussed. Besides this it is proved that the electron cooler is acting like a type U partial snake. It is found that synchrotron oscillations in COSY will lead to deviations in the asymptotic behaviour of polarization compared to the linear resonance crossing. Linear resonance crossing can be described by the well known Froissart-Stora formula. To take into account spintune and betatrontune modulation due to synchrotron oscillations there is developped an expansion to the Frossart-Stora formula. This expansion allows estimations for polarization losses where synchrotron sidebands have to be taken into account in COSY. For the electron synchrotron ELSA in the University of Bonn it is also intended to accelerate polarized particles. The problems with spin resonance crossing in ELSA are quite similar to those in COSY. Different sceems for polarization conservation are discussed for ELSA. In a theoretical part a new coordinate system especially usefull for accelerators is developped. In this ansatz the magnetic field itself defines the coordinate system. Different solutions for magnetic fields which ap pear usually in accelerators are developped and the application for particle and spin ...