Theory of optical-transition radiation and its application to pulsed electron beam diagnoses on linear induction electron accelerator
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摘要:
匀速运动的带电粒子在穿过具有不同介电常数的两种媒质界面时要产生所谓光学渡越辐射。该辐射在粒子的入射平面上呈偏振行为；从辐射强度的角分布可以确定入射粒子的能量。在入射到双膜系统的情况下，由于干涉的发生，在第二膜前表面的强度角分布有振荡行为。利用这些现象，可对脉冲电子束包络半径、束电流密度的横向分布，束能量以及横向散角进行测量，依照这原理在各LIA加速器上进行的脉冲电子束参数测量，获得的有效数据极大地提高了加速器的调试效率。
Abstract:It is can be bring optical-transition radiation(OTR) when the charged partical constant speed passed through interface of two dissimilarity intermedium. The radiation showed polarization behavior while the charged partical arrive at incidence plane, it is can be confirm energy of incidence partical corresponding OTR angle distribution patterns. The OTR angle distribution had polarization behavior at secondarily foil’s surface due to interference happened while electron beam entered the double foil system. It is can be measure parameter of pulse electron beam by used these phenomenon, The parameter includes electron beam envelope radius, landscape orientation distribution of electron beam current density, and electron beam energy, electron beam landscape orientation divergence angle distribution. using this theory to measure parameter of pulse electron beam basing on a series of Dragon LIAs and obtains valid time-resolved results. This measurement ability has improved greatly the debugging efficiency of a series of Dragon LIAs.
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图 1 光学渡越辐射（OTR）与切伦科夫的角分布花样草图
Figure 1. Optical-transition radiation patterns, single foil
图 2 OTR强度角分布
Figure 2. A schematic representation of the OTR angular-distribution pattern dependence one-beam parameters
图 3 电子束参数OTR法测量示意图
Figure 3. A schematic representation of the focus-at-the-object（beam spot）and focus-at-infinity （angular distribution）techniques
图 4 典型的LIA加速器时间分辨的束参数测量实验
Figure 4. Time-resolved beam parameter measurement system for a series of Dragon LIAs
图 5 20 MeV LIA出口处束参数时间分辨测量系统现场布局图
Figure 5. Fildwork layout of Time-resolved beam parameter measurement system for DragonⅡ LIA
图 6 20 MeV LIA出口处电子束电子束脉冲发散典型测量结果
Figure 6. Beam divergence image in sequence captured by the system
图 7 20 MeV LIA注入器内电子束包络汇聚与发散过程的分布图测量结果
Figure 7. Typical measurement series results of electron beam envelope from congregating to divergence in the injector
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