Topological cathodes: Controlling the space charge limit of electron emission using metamaterials

Dowell, David H.

doi:10.1103/physrevaccelbeams.22.084201

Title: Topological cathodes: Controlling the space charge limit of electron emission using metamaterials

Journal Article · Fri Aug 23 00:00:00 EDT 2019 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/physrevaccelbeams.22.084201· OSTI ID:1562492

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SLAC National Accelerator Lab., Menlo Park, CA (United States)

The space charge limit (SCL) of emission from photocathodes sets an upper limit on the performance of both high- and low-field electron guns. Generally, one is forced to strike a compromise between the space charge limit and the cathode’s intrinsic emittance [I. Bazarov et al., Phys. Rev. Lett. 102, 104801 (2009)]. However, it is possible to nearly eliminate the SCL due to the image charge by engineering the topography of the cathode’s surface. A cathode with a surface plasma frequency below the frequency spectrum of the accelerating electrons will greatly reduce the polarization of the cathode and its image-charge field, thereby mitigating the cathode’s space charge limit for photoelectric, thermionic, and field emission. In the work presented here, a theory for the image-charge field of a disk of charge being accelerated from the cathode surface is developed which includes the frequency-dependent effects of the cathode’s dielectric function. This theory verifies the concept of SCL mitigation with a wire array metamaterial to design a metacathode with greatly reduced image-charge fields. The details of the holistic metacathode design spanning 6 orders of magnitude in scale are described.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1562492

Journal Information:: Physical Review Accelerators and Beams, Vol. 22, Issue 8; ISSN 2469-9888

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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