Generation of electron bunches at low repetition rates using a beat-frequency technique

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1. C. K. Sinclair, P. A. Adderley, B. M. Dunham, J. C. Hansknecht, P. Hartmann, M. Poelker, J. S. Price, P. M. Rutt, W. J. Schneider, and M. Steigerwald, Phys. Rev. ST Accel. Beams 10, 023501 (2007) [SPIRES].
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7. From Møller polarimeter studies at experimental Hall A and communication with Eugene Chudakov, http://www.jlab.org/∼moller/laser_phase.html.
8. The motivation for operating the photoinjector using a narrow chopper slit is described below. There are three independent drive lasers at CEBAF, one laser for each experimental hall. Each drive laser produces a small amount of DC light, and consequently, a small amount of electron beam for neighboring halls. This is problematic because the light from each drive laser does not necessarily have the same wavelength or polarization. As a result, the DC beam created by one laser can have opposite or greatly reduced beam polarization compared to that created by another drive laser. This leads to dilution of beam polarization at individual halls, a condition most evident at halls receiving low current, for example, during Møller polarimeter measurements. Polarization dilution can be minimized by extracting a large amount of current from the photogun and using the chopper attenuator slit to reduce beam current to a manageable level. In this manner, the portion of the delivered beam from other drive lasers is less than 1%.
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10. L. J. deBever, M. Loppacher, J. Zhao, W. A. Tobias, and B. Zihlmann, in the Proceedings of the 12th International Symposium on High Energy Spin Physics (SPIN96) (Ref. [6]).
11. See, for example, M. E. Christy et al., Phys. Rev. C 70, 015206 (2004) [SPIRES].