1996/10/01 by X. J. Wang, Xijie Wang, X. Qiu +3 · 3 citations
Engineering · #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics #Photocathodes and Microchannel Plates
paper · doi:10.1103/physreve.54.r3121
openalex publication_date 1996/10/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We report the measurement of very short, high-brightness bunches of electrons produced in a photocathode rf gun with no magnetic compression. The electron beam bunch length and the charge distribution along the bunch were measured by passing the energy chirped the electron beam through a momentum selection slit while varying the phase of the rf linac. The bunch compression as a function of rf gun phase and electric field at the cathode were investigated. The shortest measured bunch is 370\ifmmode±\else\textpm\fi100 fs (at 95% of the charge) with 2.5\ifmmode×\else\texttimes\fi108 electrons (170 A peak current); the normalized rms emittance of this beam was measured to be 0.5\ensuremathπ mm mrad and the energy spread is 0.15%.