Abstract
We have measured the extractable charge during one lifetime (Charge lifetime, Qτ) of a NEA-GaAs-photocathode for two beam diameters. A limitation of Qτ to 1100 Coulomb due to ion-back-bombardment was observed for a 1.5 mm diameter emission site. When increasing the laser diameter from .3 to 1.5 mm we observe an increase of Qτ by a factor ≈ 5, which is in disagreement with the assumed proportionality of the charge lifetime with emission area. Possible reasons for this discrepancy are analyzed.
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CITATION STYLE
Aulenbacher, K., Alexander, I., Riehn, E., & Tioukine, V. (2011). High average photocurrent research at MAMI. In Journal of Physics: Conference Series (Vol. 298). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/298/1/012019
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