Bunching phenomena during electron injection into the betatron II. Theory of starting conditions |
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Authors: | M Seidl |
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Institution: | (1) Institute of Vacuum Electronics, Czechosl. Acad. Sci., Prague |
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Abstract: | A theory of the azimuthal bunching of electrons injected into the betatron is presented and compared with the experiments described in 1]. The bunching is treated as a small perturbation of the stationary beam.The stationary injected beam is replaced by the corresponding equilibrium beam of the same perveance so that the angular velocity spread of the injected electrons is proportional to the square root of the injection perveance.Self-consistent wave solutions for the perturbation of the stationary solution are then found. Equations giving the amplification of small density or energy disturbances along the beam are derived. These disturbances are assumed to be introduced by density or velocity modulation of the injected beam. The condition for the spontaneous occurrence of bunching is deduced by assuming that the disturbances do not vanish even when there is no modulation of the injected beam. The resulting expressions for the threshold perveance and the rise-time of the disturbance are in reasonably good agreement with the experiments. Such agreement may be considered as further verification of the statement made in 1] that the amplification of the disturbances is caused by the negative mass instability mechanism.
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![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![yacy](/content/q7136k1t81170682/xxlarge1103.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![vcy](/content/q7136k1t81170682/xxlarge1074.gif) ![rcy](/content/q7136k1t81170682/xxlarge1088.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![mcy](/content/q7136k1t81170682/xxlarge1084.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![rcy](/content/q7136k1t81170682/xxlarge1088.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![scy](/content/q7136k1t81170682/xxlarge1089.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) 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![rcy](/content/q7136k1t81170682/xxlarge1088.gif) ![icy](/content/q7136k1t81170682/xxlarge1080.gif) ![mcy](/content/q7136k1t81170682/xxlarge1084.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) . ![Ecy](/content/q7136k1t81170682/xxlarge1069.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![dcy](/content/q7136k1t81170682/xxlarge1076.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![kcy](/content/q7136k1t81170682/xxlarge1082.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![zcy](/content/q7136k1t81170682/xxlarge1079.gif) ![ycy](/content/q7136k1t81170682/xxlarge1099.gif) ![vcy](/content/q7136k1t81170682/xxlarge1074.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) , ![chcy](/content/q7136k1t81170682/xxlarge1095.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![ucy](/content/q7136k1t81170682/xxlarge1091.gif) ![scy](/content/q7136k1t81170682/xxlarge1089.gif) ![icy](/content/q7136k1t81170682/xxlarge1080.gif) ![lcy](/content/q7136k1t81170682/xxlarge1083.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![icy](/content/q7136k1t81170682/xxlarge1080.gif) ![vcy](/content/q7136k1t81170682/xxlarge1074.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![zcy](/content/q7136k1t81170682/xxlarge1079.gif) ![mcy](/content/q7136k1t81170682/xxlarge1084.gif) ![ucy](/content/q7136k1t81170682/xxlarge1091.gif) ![shchcy](/content/q7136k1t81170682/xxlarge1097.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![icy](/content/q7136k1t81170682/xxlarge1080.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![bcy](/content/q7136k1t81170682/xxlarge1073.gif) 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![softcy](/content/q7136k1t81170682/xxlarge1100.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![ncy](/content/q7136k1t81170682/xxlarge1085.gif) ![iecy](/content/q7136k1t81170682/xxlarge1077.gif) ![ucy](/content/q7136k1t81170682/xxlarge1091.gif) ![scy](/content/q7136k1t81170682/xxlarge1089.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![jcy](/content/q7136k1t81170682/xxlarge1081.gif) ![chcy](/content/q7136k1t81170682/xxlarge1095.gif) ![icy](/content/q7136k1t81170682/xxlarge1080.gif) ![vcy](/content/q7136k1t81170682/xxlarge1074.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![scy](/content/q7136k1t81170682/xxlarge1089.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) ![softcy](/content/q7136k1t81170682/xxlarge1100.gif) ![pcy](/content/q7136k1t81170682/xxlarge1087.gif) ![ucy](/content/q7136k1t81170682/xxlarge1091.gif) ![chcy](/content/q7136k1t81170682/xxlarge1095.gif) ![kcy](/content/q7136k1t81170682/xxlarge1082.gif) , ![kcy](/content/q7136k1t81170682/xxlarge1082.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![ucy](/content/q7136k1t81170682/xxlarge1091.gif) ![kcy](/content/q7136k1t81170682/xxlarge1082.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![zcy](/content/q7136k1t81170682/xxlarge1079.gif) ![ycy](/content/q7136k1t81170682/xxlarge1099.gif) ![vcy](/content/q7136k1t81170682/xxlarge1074.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![lcy](/content/q7136k1t81170682/xxlarge1083.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![scy](/content/q7136k1t81170682/xxlarge1089.gif) ![rcy](/content/q7136k1t81170682/xxlarge1088.gif) ![acy](/content/q7136k1t81170682/xxlarge1072.gif) ![bcy](/content/q7136k1t81170682/xxlarge1073.gif) ![ocy](/content/q7136k1t81170682/xxlarge1086.gif) ![tcy](/content/q7136k1t81170682/xxlarge1090.gif) 1].
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