Abstract
The long-wavelength radiation emitted along a straight-section axis of an electron storage ring is considered. A bending magnet at the beginning or end of a straight section produces cylindrically-symmetric “edge” radiation with radial polarization, collimated in a cone with opening angle of ∼ 1 γ , where γ is the relativistic mass factor. A small deflection from a steering magnet or misaligned quadrupole results in “kicker” radiation, also collimated with an opening angle of ∼ 1 γ , for which the photon flux is proportional to the square of the deflection angle. Intermediate deflection angles of ∼ 1 γ produce a photon flux comparable to edge radiation. Downstream of a typical straight section which includes entrance and exit bending magnet edges, wiggler or undulator, and miscellaneous steering kicks comparable to 1 γ , the long-wavelength radiation is a superposition from numerous sources, each producing a comparable photon flux with opening angle of ∼ 1 γ .
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