Abstract
We report the high-gradient acceleration of electrons driven by a subnanosecond pulse of Ka-band Cherenkov superradiance (SR). The experiments are carried out in a combined ``generator-accelerator'' scheme, powered by two electron beams from a coaxial explosive-emission graphite cathode. The outer tubular beam ($\ensuremath{\approx}300\text{ }\text{ }\mathrm{keV}$; $\ensuremath{\approx}2.3\text{ }\text{ }\mathrm{kA}$) propagates along the periodic slow-wave structure (SWS) and generates a backward moving gigawatt-level SR pulse, which pumps a low-Q ``pill-box'' resonator located at the SWS input. The inner paraxial test beam ($\ensuremath{\approx}250\text{ }\text{ }\mathrm{keV}$; $\ensuremath{\approx}150\text{ }\text{ }\mathrm{A}$) passes through a hole in the resonator wall and is accelerated in extreme SR fields exceeding $500\text{ }\text{ }\mathrm{MV}/\mathrm{m}$. The energy of accelerated electrons is estimated by measuring the test beam current after it passes through aluminum filters (foils) that absorb low-energy electrons. It is shown that the test beam contains fractions with a maximum energy of 1.25 MeV, which, taking into account the pill-box length of 4 mm, corresponds to the extremely high averaged accelerating gradient of $250\text{ }\text{ }\mathrm{MV}/\mathrm{m}$.
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