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Montgomery, E. J.

Paper Title Page
TUPMS010 Fabrication and Measurement of Efficient, Robust Cesiated Dispenser Photocathodes 1206
 
  • E. J. Montgomery, D. W. Feldman, N. A. Moody, P. G. O'Shea, Z. Pan
    UMD, College Park, Maryland
  • K. Jensen
    NRL, Washington, DC
 
  Funding: This work is funded by the Office of Naval Research and the Joint Technology Office.

Photocathodes for high power free electron lasers face significant engineering and physics challenges in the quest for efficient, robust, long-lived, prompt laser-switched operation. The most efficient semiconductor photocathodes, notably those responsive to visible wavelengths, suffer from poor lifetime due to surface layer degradation, contamination, and desorption. Using a novel dispenser photocathode design, rejuvenation of cesiated surface layers in situ is investigated for semiconductor coatings building on previous results for cesiated metals. Cesium from a sub-surface reservoir diffuses to the surface through a microscopically porous, sintered tungsten matrix to repair the degraded surface layer. The goal of this research is to engineer and demonstrate efficient, robust, long-lived regenerable photocathodes in support of predictive photocathode modeling efforts and suitable for photoinjection applications.