Maximum achievable beam brightness from photoinjectors.

@article{Bazarov2009MaximumAB,
  title={Maximum achievable beam brightness from photoinjectors.},
  author={Ivan V. Bazarov and Bruce M. Dunham and C. K. Sinclair},
  journal={Physical review letters},
  year={2009},
  volume={102 10},
  pages={
          104801
        }
}
Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy of the electrons leaving the photocathode and the accelerating field at the cathode. Two specific examples--direct measurement of the… 

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