Abstract
Energy change of an electron beam is studied numerically when it transits a rf field gap of width L. For a premodulated beam, the transit time L/ for maximum energy extraction is shortened to 0.475 T (T=2π/ω, is the average velocity of the electrons) when the modulation frequency ωm is matched to the rf field frequency ω. Enhancement of the extraction efficiency ηo is dependent on the modulation coefficient h1 and h2. For a uniform beam with V=500 kV, ηo is less than 2%. ηo reaches 11% for a prebunched beam with h1=0.7 and h2=0.1 and will surpass 20% for an ideally modulated beam.
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