Speaker
Description
Most advanced electron beam applications, including particle colliders, X-ray free-electron lasers, and ultrafast electron diffraction and microscopy experiments, require beams with exceptionally high brightness. Electron sources must also exhibit long operational lifetime and robustness under the high electric fields and laser fluences characteristic of photoinjector environments. In the search for high-performance photoemissive electron sources, recent studies have identified epitaxially grown single-crystal cesium antimonides as highly promising candidates to provide low mean transverse energy (MTE) and high quantum efficiency (QE).
In this work, we present the experimental setup developed for the growth of alkali antimonide photocathodes by molecular beam epitaxy on lattice-matched substrates. Extensive testing and characterization of photocathodes will be carried out in the L-band RF gun of the Argonne Cathode Test-stand (ACT). To enable reliable transfer of photocathodes under ultra-high vacuum (UHV) conditions, a compatible cathode plug, load-lock system, and vacuum suitcase have been developed. RF and beam dynamics simulations of the newly designed plug have also been performed and will be discussed in this work.
| Working group | WG5 |
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