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Scoby, C.M.

Paper Title Page
MO6RFP097 Longitudinal Beam Dynamics of the Photoinjector Blowout Regime 596
 
  • J.T. Moody, M.S. Gutierrez, P. Musumeci, C.M. Scoby
    UCLA, Los Angeles, California
  
 

Funding: Office of Naval Research (US) Grant No. N000140711174


Longitudinal beam dynamics of the photoinjector "blowout" regime are investigated. A two beamlet macroparticle approach is first used to investigate the effects of S-Band RF photogun fields on a picosecond time scale. The beams' longitudinal phase spaces (LPS) are measured via an X-band RF deflecting cavity and dipole spectrometer. Lastly, the LPS of a single subpicosecond beam is investigated as a function of initial charge density at the cathode and compared to simulation.

  
MO6RFP098 Time Resolved Relativistic Electron Diffraction 599
 
  • P. Musumeci, M.S. Gutierrez, J.T. Moody, C.M. Scoby
    UCLA, Los Angeles, California
  
 

We report on the use of a ultrashort high brigthness relativistic beam from the UCLA Pegasus laboratory RF photoinjector source for probing matter transformation at the atomic scale with sub-100 fs time resolution. The high accelerating gradient and the relativistic electron energy allow to pack more than 107 electrons in less than 100 fs bunch length, enabling the study of irreversible ultrafast phenomena by single-shot diffraction patterns. The experimental setup, and the initial results from the first ever relativistic electron diffraction time-resolved study will be discussed.

  
TH6REP102 Electro-Optic Sampling of Low Charge Low Energy Relativistic Electron Bunches at Pegasus Laboratory 4192
 
  • C.M. Scoby, M.S. Gutierrez, J.T. Moody, P. Musumeci
    UCLA, Los Angeles, California
  
 

Funding: Office of Naval Research (US) Grant No. N000140711174


Electro-optic sampling (EOS) has been developed as a timing monitor at Pegasus photoinjector laboratory for 100-fs electron bunches. A geometrically simple 2-dimensional spatially encoding scheme is used to measure time-of-arrival (TOA) of these ultrashort electron bunches in a 20 ps window down to < 50 fs resolution. The setup described here has successfully observed EOS signals for low energy (~4 MeV) and low charge (< 10 pC) bunches, both parameters being lower than electro-optic TOA monitors currently used in other labs. Experimental 2-d EOS images are compared to particle-in-cell plasma simulations (OOPIC) of electron bunch transient electric fields in ZnTe and to theoretical field propagation in dielectric crystals.