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Abstract: Tabrizi et al. physics-0701342 discuss the feasibility of an electron-basedcrystal undulator e-CU by planar channeling of 50 GeV electrons through aperiodically bent crystal. We show that their scheme is not feasible. First,their undulator parameter is K >> 1 always, which destroys photon interference.Second, they overestimate the electron dechanneling length in e-CU by an orderof magnitude, which shortens the number N of e-CU periods from 5-15 as theyhope to just 1-2. This kills their e-CU concept again. We made firstsimulation of electron channeling in undulated crystal and conclude that anelectron-based crystal wiggler is feasible with wiggler strength K=10 andnumber of periods N=2.



Author: V.M. Biryukov

Source: https://arxiv.org/







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