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- J.H. Shao, M.E. Conde, W. Liu, J.G. Power, E.E. Wisniewski
ANL, Argonne, Illinois, USA
- S.V. Baryshev, M.S. Schneider
Michigan State University, East Lansing, Michigan, USA
- G. Chen
IIT, Chicago, Illinois, USA
- K. Kovi
Euclid TechLabs, LLC, Solon, Ohio, USA
- L.K. Spentzouris
Illinois Institute of Technology, Chicago, Illinois, USA
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Planar nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, is a unique and attractive field emission source because of the capability to generate high charge beam, the simplicity of production without shaped emitters, and the ease of handling with moderate vacuum requirement. In the presented study using an L-band normal conducting single-cell rf gun, a (N)UNCD cathode has been conditioned to 42 MV/m with a well-controlled manner and reached a maximum charge of 15 nC and an average emission current of 6~mA during a 2.5 us emission period. The systematic study of emission properties during the rf conditioning process illustrates the tunability of (N)UNCD in a wide range of surface gradients. This research demonstrates the versatility of (N)UNCD cathode which could enable multiple designs of field emission rf injector for industrial and scientific applications.
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