Author: Sannibale, F.
Paper Title Page
MOAL3 Diagnostic for a High Repetition Rate Electron Photo-Gun and First Measurements 4
  • D. Filippetto, S. De Santis, L.R. Doolittle, G. Huang, W.E. Norum, G.J. Portmann, H.J. Qian, F. Sannibale, R.P. Wells
    LBNL, Berkeley, California, USA
  Funding: DOE grants No. DE-AC02-05CH11231
The APEX electron source at LBNL combines the high-repetition-rate with the high beam brigthness typical of photo-guns, 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 full 6D characterization of the beam 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 are currently being commissioned. The recently installed double slit system will allow the measurements of beam emittance at full current (mA). Also a deflecting cavity and a high precision spectrometer are foreseen at low energy, allowing the exploration of the longitudinal 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.
slides icon Slides MOAL3 [10.786 MB]  
MOPC24 Design Of The Stripline BPM For The Advanced Photoinjector Experiment 108
  • S. De Santis, M.J. Chin, D. Filippetto, W.E. Norum, Z. Paret, G.J. Portmann, F. Sannibale, R.P. Wells
    LBNL, Berkeley, California, USA
  Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
We describe the design, bench testing, and initial commissioning of the shorted striplines beam position monitors used in the Advanced Photoinjector Experiment (APEX) at Lawrence Berkeley National Laboratory. Our BPM's are characterized by extreme compactness, being designed to fit in the vacuum chamber of the quadrupole magnets, with only a short portion including the RF feedthroughs occupying additional beam pipe length. In this paper we illustrate the design process, which included extensive 3D computer simulations, the bench testing of prototype and final components, and the first measurements with beam. The readout electronics is also described.