  High-power electron beams are sought-after tools in support to a wide array
of societal applications. This paper investigates the production of high-power
electron beams by combining a high-current field-emission electron source to a
superconducting radio-frequency (SRF) cavity. We especially carry out
beam-dynamics simulations that demonstrate the viability of the scheme to form
$\sim$ 300 kW average-power electron beam using a 1+1/2-cell SRF gun.
