Self-amplifacation of channeling radiation of ultrarelativistic electrons due to loss of transverse energy |
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| Institution: | 1. Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi’an Jiaotong University, Xi’an 710049, China;2. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg 69117, Germany;3. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, Dresden 01328, Germany;4. Department of Physics, Shanghai Normal University, Shanghai 200234, China |
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| Abstract: | When an axially channeled electron emits one photon, its transverse kinetic energy decreases by roughly the same ratio as the longitudinal energy. If this ratio is not small compared to 1, the electron after emission spends a significantly larger fraction of its time in the strong field region than before emission, and the probability of emitting new phonons increases accordingly. This makes the cascade of emissions self-accelerating, and can explain the anomalously large energy radiated by 150 GeV electrons channeled in germanium in a recent experiment. Multiple scattering is important in moderating this mechanism. |
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