Since 2000, an inverted source for polarized electrons is in operation at the electron stretcher accelerator ELSA of Bonn university. Within several years of operation for the GDH experiment, the gun provided a pulsed beam with high polarization and intensity using a single strained‐layer superlattice photocathode. The generation of rectangularly shaped pulses with 100 nC charge is achieved by optical pumping with a flashlamp‐pumped titanium sapphire laser and space charge limited emission at 50 keV. Continuous degradation of the photocathode due to oxygen deposition on the surface which could not be removed completely by heat cleaning at moderate temperatures had been observed. In order to enhance the reliability and uptime of the source, a new load‐lock system with crystal storage and atomic hydrogen cleaning will be installed in the near future.
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13 June 2007
Proceedings of the 17th International Spin Physics Symposium
2-7 October 2006
Kyoto, Japan
Research Article|
June 13 2007
The 50 keV Source of Polarized Electrons at ELSA: Past and Future
Maren Eberhardt;
Maren Eberhardt
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
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Jürgen Wittschen;
Jürgen Wittschen
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
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Michael Gowin;
Michael Gowin
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
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Wolfgang Hillert;
Wolfgang Hillert
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
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Bernhard Neff
Bernhard Neff
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
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Maren Eberhardt
Jürgen Wittschen
Michael Gowin
Wolfgang Hillert
Bernhard Neff
University of Bonn, Physics Institute, Nussallee 12, 53115 Bonn, Germany
AIP Conf. Proc. 915, 1031–1036 (2007)
Citation
Maren Eberhardt, Jürgen Wittschen, Michael Gowin, Wolfgang Hillert, Bernhard Neff; The 50 keV Source of Polarized Electrons at ELSA: Past and Future. AIP Conf. Proc. 13 June 2007; 915 (1): 1031–1036. https://doi.org/10.1063/1.2750948
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