POLARIZED ELECTRONS AT 3 . 5 GeV ELSA ( Bonn )

S. Nakamura,W. v. Drachenfels, D. Durek,F. Frommberger,M. Hoffmann, D. Husmann, B. Kiel,F. Klein,F. J. Klein,D. Menze, T. Michel,T. Nakanishi, J. Naumann,S. Okumi, T. Reichelt, H. Sato,B. Schoch,C. Steier,K. Togawa,T. Toyama, S. Voigt, M. Westermann

semanticscholar（2012）

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Abstract

Polarized electrons was accelerated in the 3.5 GeV electron stretcher accelerator ELSA. The polarization of the electron beam produced by a polarized electron source was measured up to 2.1 GeV by a Møller polarimeter. By optimizing the ramping speed to cross several depolarizing resonances, the polarization of 45% could be preserved up to 1.9 GeV. Strong depolarization occurred at 2.0 GeV (intrinsic resonance), and the construction of fast tune jump quadrupoles are in progress to conserve the high polarization above 2.0 GeV.

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