skip to main content


Title: Delayed photo-emission model for beam optics codes

Future advanced light sources and x-ray Free Electron Lasers require fast response from the photocathode to enable short electron pulse durations as well as pulse shaping, and so the ability to model delays in emission is needed for beam optics codes. The development of a time-dependent emission model accounting for delayed photoemission due to transport and scattering is given, and its inclusion in the Particle-in-Cell code MICHELLE results in changes to the pulse shape that are described. Furthermore, the model is applied to pulse elongation of a bunch traversing an rf injector, and to the smoothing of laser jitter on a short pulse.
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. Naval Research Lab., Washington, D.C. (United States)
  2. Leidos Corp., Billerica, MA (United States)
  3. Gnosys, Inc., Providence, RI (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
Published Article
Journal Name:
Journal of Vacuum Science and Technology. B, Nanotechnology and Microelectronics
Additional Journal Information:
Journal Volume: 35; Journal Issue: 2; Conference: International Vacuum Nanoelectronics Conference 2016; Journal ID: ISSN 2166-2746
American Vacuum Society/AIP
Research Org:
Gnosys Systems, Inc., Providence, RI (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; free electron lasers; photocathodes; delayed emission modeling; particle-in-cell code; MICHELLE; 47 OTHER INSTRUMENTATION
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1333238; OSTI ID: 1345312; OSTI ID: 1436565