title: Generation of Cherenkov superradiance pulses with a peak power exceeding the power of the driving short electron beam.
abstract: Theoretical investigation of a short electron beam (extended bunch) interaction with a backward wave propagating in a slow wave structure demonstrates the possibility of producing ultrashort superradiance pulses with a peak power which exceeds the power of the driving beam (conversion factor K>1). It is shown that a nonuniform slow wave structure with optimized profile is beneficial in order to increase the conversion factor. The results of theoretical analysis are confirmed by the experiments. At X band using the SINUS-150 accelerator (4 ns, 330 kV, 2.6 kA) 0.6-0.8 ns superradiance pulses with a peak power of 1.2 GW and a conversion factor of 1.5 were obtained. Similar experiments at Ka-band based on the RADAN-303 accelerator (1 ns, 290 kV, 2.5 kA) demonstrated production of the superradiance (SR) pulse with duration 200 ps and peak power about 1 GW (conversion factor of 1.4).
authors.affiliation: Institute of High Current Electronics, Russian Academy of Sciences, Tomsk, Russia.
authors.forename: S D
authors.initials: SD
authors.lastname: Korovin
authors.forename: A A
authors.initials: AA
authors.lastname: Eltchaninov
authors.forename: V V
authors.initials: VV
authors.lastname: Rostov
authors.forename: V G
authors.initials: VG
authors.lastname: Shpak
authors.forename: M I
authors.initials: MI
authors.lastname: Yalandin
authors.forename: N S
authors.initials: NS
authors.lastname: Ginzburg
authors.forename: A S
authors.initials: AS
authors.lastname: Sergeev
authors.forename: I V
authors.initials: IV
authors.lastname: Zotova