Diagnostic for a high-repetition rate electron photo-gun and first measurements

D. Filippetto; L. Doolittle; G. Huang; E. Norum; G. Portmann; H. Qian; F. Sannibale

doi:10.1117/12.2182470

12 May 2015 Diagnostic for a high-repetition rate electron photo-gun and first measurements

D. Filippetto, L. Doolittle, G. Huang, E. Norum, G. Portmann, H. Qian, F. Sannibale

Proceedings Volume 9512, Advances in X-ray Free-Electron Lasers Instrumentation III; 95120F (2015) https://doi.org/10.1117/12.2182470
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

The APEX electron source at LBNL combines the high-repetition-rate with the high beam brightness typical of photoguns, delivering low emittance electron pulses at MHz frequency. Proving the high beam quality of the beam is an essential step for the success of the experiment, opening the doors of the high average power to brightness-hungry applications as X-Ray FELs, MHz ultrafast electron diffraction etc.. As first step, a complete characterization of the beam parameters is foreseen at the Gun beam energy of 750 keV. Diagnostics for low and high current measurements have been installed and tested, and measurements of cathode lifetime and thermal emittance in a RF environment with mA current performed. The recent installation of a double slit system, a deflecting cavity and a high precision spectrometer, allow the exploration of the full 6D phase space. Here we discuss the present layout of the machine and future upgrades, showing the latest results at low and high repetition rate, together with the tools and techniques used.

Citation Download Citation

D. Filippetto, L. Doolittle, G. Huang, E. Norum, G. Portmann, H. Qian, and F. Sannibale "Diagnostic for a high-repetition rate electron photo-gun and first measurements", Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 95120F (12 May 2015); https://doi.org/10.1117/12.2182470

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