[Triumf-seminars] TRIUMF Accelerator Seminar today at 14:00

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Date/Time: Wed 2010-12-15 at 14:00

Location:  ISAC II Conf        

Speaker:   Charles Sinclair (Cornell University (retired))

Title:     Negative Electron Affinity Photocathodes for High Brightness Beams

Abstract: The capital cost of an electron accelerator to deliver a high brightness beam for x-ray production, such as an FEL or an ERL light source, is very strongly related to the smallest emittance than can be generated in the injector.  A detailed computational optimization of a real photoemission injector design has demonstrated that it is possible very largely to preserve the thermal emittance of the photocathode through the injector.  Thus, photoemission cathodes providing the smallest thermal emittances are of considerable practical interest.  At the present time, negative electron affinity photocathodes provide the smallest thermal emittances of any photocathode.  Though these cathodes have been used on accelerators for nearly 35 years, there are still many details that are not well understood.  We will review the current state of the art with these cathodes, and indicate some directions for future work.



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