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Title: Planar ultrananocrystalline diamond field emitter in accelerator radio frequency electron injector: Performance metrics

A case performance study of a planar field emission cathode (FEC) based on nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, was carried out in an RF 1.3 GHz electron gun. The FEC was a 100 nm (N)UNCD film grown on a 20 mm diameter stainless steel disk with a Mo buffer layer. At surface gradients 45–65 MV/m, peak currents of 1–80 mA (equivalent to 0.3–25 mA/cm{sup 2}) were achieved. Imaging with two YAG screens confirmed emission from the (N)UNCD surface with (1) the beam emittance of 1.5 mm × mrad/mm-rms and (2) longitudinal FWHM and rms widths of non-Gaussian energy spread of 0.7% and 11% at an electron energy of 2 MeV. Current stability was tested over the course of 36 × 10{sup 3} RF pulses (equivalent to 288 × 10{sup 6 }GHz oscillations)
Authors:
; ; ;  [1] ;  [2] ; ; ;  [3] ; ;  [4] ;  [1]
  1. Euclid TechLabs, 365 Remington Blvd., Bolingbrook, Illinois 60440 (United States)
  2. (United States)
  3. High Energy Physics Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States)
  4. Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22392040
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIAMONDS; ELECTRON GUNS; FIELD EMISSION; FILMS; GHZ RANGE 01-100; LAYERS; MEV RANGE 01-10; NANOSTRUCTURES; NEODYMIUM LASERS; NITROGEN; PERFORMANCE; STAINLESS STEELS