Near atomically smooth alkali antimonide photocathode thin films
Accelerator Physics (physics.acc-ph)
FOS: Physical sciences
02 engineering and technology
01 natural sciences
Mathematical Sciences
Engineering
Physical Sciences
0103 physical sciences
Physics - Accelerator Physics
0210 nano-technology
physics.acc-ph
Applied Physics
DOI:
10.1063/1.4974363
Publication Date:
2017-01-24T16:13:53Z
AUTHORS (6)
ABSTRACT
Nano-roughness is one of the major factors degrading the emittance of electron beams that can be generated by high efficiency photocathodes, such as the thermally reacted alkali antimonide thin films. In this paper, we demonstrate a co-deposition based method for producing alkali antimonide cathodes that produce near atomic smoothness with high reproducibility. We calculate the effect of the surface roughness on the emittance and show that such smooth cathode surfaces are essential for operation of alkali antimonide cathodes in high field, low emittance radio frequency electron guns and to obtain ultracold electrons for ultrafast electron diffraction applications.
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