Normalized Intrinsic Emittance of Cold Emission Cathodes

Miron Voin, Levi Schachter

Research output: Contribution to conferencePaperpeer-review

Abstract

We establish the normalized intrinsic emittance for cold emission
cathodes, associated with the energy and angular spread of the emitted particles directly on the surface of the emitter for a given local field
applied. While in principle we are motivated primarily by carbonnanotube (CNT) cathodes, our approach is applicable to any type of
cold cathode. Its essence relies on the evaluation of the initial momentum as the particles tunnel through the Schottky-Nordheim barrier based on the spectral radiance function. Next, the momentum
distribution is integrated over the geometry, providing, along with well
known Fowler-Nordheim current, an integral expression for the emittance. According to our theoretical results and based on experimental data for CNT emitters available in the literature, we predict that
practical cold emission cathodes may provide a normalized intrinsic
emittance comparable or even superior to that of conventional photoemission cathodes used in state-of-the-art electron sources.
WEPAB147 Simulations of Nanoblade-Enhanced Laser-Induced Cath
Original languageAmerican English
StatePublished - 2021
Event12th International Particle Accelerator Conference -
Duration: 24 May 202128 May 2021
Conference number: 12th
https://www.ipac21.org/index.php#

Conference

Conference12th International Particle Accelerator Conference
Abbreviated titleIPAC2021
Period24/05/2128/05/21
Internet address

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