The Transit Time Effect of a Modulated Electron Beam |
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Authors: | Wenyuan Yang and Wu Ding |
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Institution: | (1) Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing, 100088, People's Republic of China |
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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/0> for maximum energy extraction is shortened to 0.475 T (T=2/, 0> is the average velocity of the electrons) when the modulation frequency m is matched to the rf field frequency . Enhancement of the extraction efficiency o is dependent on the modulation coefficient h1 and h2. For a uniform beam with V=500 kV, o is less than 2%. o 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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Keywords: | transit time effect modulate extraction efficiency |
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