English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

High brightness, high repetition rate electron beams are key components foroptimizing the performance of next generation scientific instruments, such asMHz-class X-ray Free Electron Laser (XFEL) and Ultra-fast ElectronDiffraction/Microscopy (UED/UEM). In the Advanced Photo-injector EXperiment(APEX) at Berkeley Lab, a photoelectron gun based on a 185.7 MHz normalconducting re-entrant RF cavity, has been proven to be a feasible solution toprovide high brightness, high repetition rate electron beam for both XFEL andUED/UEM. Based on the success of APEX, a new electron gun system, named APEX2,has been under development to further improve the electron beam brightness. ForAPEX2, we have designed a new 162.5 MHz two-cell photoelectron gun and achieveda significant increase on the cathode launching field and the beam exit energy.For a fixed charge per bunch, these improvements will allow for the emittancereduction and hence an increased beam brightness. The design of APEX2 guncavity is a complex problem with multiple design goals and restrictions, someeven competing each other. For a systematic and comprehensive search for theoptimized cavity geometry, we have developed and implemented a noveloptimization method based on the Multi-Objective Genetic Algorithm (MOGA).

RF design of APEX2 two-cell continuous-wave normal conducting photoelectron gun cavity based on multi-objective genetic algorithm