Speaker
Description
The Taiwan Photon Source (TPS) is a 3 GeV third-generation synchrotron light source equipped with several in-vacuum undulators (IVUs) and an elliptically polarized undulator (EPU) installed in straight sections. These insertion devices (IDs) are designed to operate in straights where the horizontal dispersion is small but non-zero. In this regime, IDs contribute not only to the principal radiation integrals ๐ผ2 and ๐ผ3, but also to ๐ผ1, ๐ผ4 and to the dispersive part of ๐ผ5, thereby modifying the damping partition numbers and the equilibrium emittance at a subtle yet measurable level.
In this paper we present a comprehensive beam-dynamics study of the impact of these undulators on the TPS storage ring. The analysis is based on a detailed pyAT model of the bare TPS lattice and two complementary models of the IDs: (i) ideal planar wigglers, and (ii) realistic Radia kickmaps which include the three-dimensional field geometry. For each model we compute synchrotron-radiation integrals, natural emittance, relative energy spread, radiation energy loss per turn, synchronous phase, synchrotron tune, betatron tunes, chromaticities, and ฮฒ-beat for individual IDs and for the configuration with all IDs closed.
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