Details

Autor(en) / Beteiligte

• Ginzburg, N. S.
• Fedotov, A. E.
• Kuzikov, S. V.
• Sharypov, K. A.
• Shpak, V. G.
• Shunailov, S. A.
• Vikharev, A. A.
• Yalandin, M. I.
• Zotova, I. V.

Titel

Demonstration of high-gradient electron acceleration driven by subnanosecond pulses of Ka-band superradiance

Ist Teil von

• Physical review. Accelerators and beams, 2023-06, Vol.26 (6), p.060401, Article 060401

Ort / Verlag

American Physical Society

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (≈300  keV; ≈2.3  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 (≈250  keV; ≈150  A) passes through a hole in the resonator wall and is accelerated in extreme SR fields exceeding 500  MV/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  MV/m.