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In this paper we present a critical re-examination of Transition Undulator radiation, that has been first investigated a decade ago. We study a realistic undulator setup, which includes an undulator, two straight sections and two bends, before and after the undulator. This allows us to underline an important physical fact: it does not make sense to study the intensity distribution of transition radiation from an undulator without a detailed knowledge of the complete setup. The present paper also helps to point out several misconceptions present in literature regarding Coherent Transition Undulator Radiation.
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