TITLE

The polarized electron beam at ELSA

AUTHOR(S)
Hoffmann, M.; Drachenfels, W. v.; Frommberger, F.; Gowin, M.; Helbing, K.; Hillert, W.; Husmann, D.; Keil, J.; Michel, T.; Naumann, J.; Speckner, T.; Zeitler, G.
PUB. DATE
June 2001
SOURCE
AIP Conference Proceedings;2001, Vol. 570 Issue 1, p756
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The future medium energy physics program at the electron stretcher accelerator ELSA of Bonn University mainly relies on experiments using polarized electrons in the energy range from 1 to 3.2 GeV. To provide a polarized beam with high polarization and sufficient intensity a dedicated source has been developed and set into operation. To prevent depolarization during acceleration in the circular accelerators several depolarizing resonances have to be corrected for. Intrinsic resonances are compensated using two pulsed betatron tune jump quadrupoles. The influence of imperfection resonances is successfully reduced applying a dynamic closed orbit correction in combination with an empirical harmonic correction on the energy ramp. In order to minimize beam depolarization, both types of resonances and the correction techniques have been studied in detail. It turned out that the polarization in ELSA can be conserved up to 2.5 GeV and partially up to 3.2 GeV which is demonstrated by measurements using a Moiler polarimeter installed in the external GDH&supl;-beamline.
ACCESSION #
6310180

 

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