Speaker
Description
Low Mean Transverse Energy (MTE) photocathodes play a crucial role in enhancing the performance and capabilities of Free Electron Lasers (FELs) and other advanced electron accelerator applications, enabling groundbreaking scientific research across diverse fields. Due to the requirements for the high charge density, disordered nature of photocathode materials, surface roughness and work function variations, the MTE of electrons emitted from conventional photocathodes is limited to several 100s of meV, which is nearly an order of magnitude larger than the theoretically predicted MTE limit. Moreover, most electron sources used for high-brightness applications degrade under high applied electric fields or large incident laser fluences. Therefore, robust photocathodes capable of emitting bright electron beams with significantly reduced MTE can enable higher-quality FEL output with better beam characteristics. In this talk, we will review different techniques for advanced photocathode modeling, growth, fabrication, and characterization which are used at the Center for Bright Beams (CBB, https://cbb.cornell.edu) towards brighter electron beam production.
Funding Agency
The author thanks the Center for Bright Beams, NSF award PHY-1549132.
