Abstract
Emittance is an important factor to judge the property of the electron storage ring. The emittance of a storage ring is an equilibrium balance of quantum fluctuations and radiation damping; it is relative to the electron beam size and beam divergence, how to improve the emittance to satisfy the user’s requirement and to solve the unstable of the electron storage ring is the heart issue in the accelerator physics. Therefore, there are two main parts in this thesis. (1) We design a gradient damping wiggler to change the horizontal damping partition number in a storage ring and (2) we design Robinson wiggler to change the damping partition number in a third generation light source storage ring. The first one is the ALPHA storage ring at the Center for Exploration of Energy and Matter (CEEM) in Indiana University. The ALPHA storage ring is made of four dipole magnets with 12 degree edge angle. The horizontal damping partition number is negative for all storage ring without quadruples. We develop and manufacture the gradient damping wiggler (GDW) which can be used to change the damping partition number effectively, and to vary the momentum compaction factor from 0.5 to -0.5. The second part is to reduce the horizontal emittance of Low-emittance mode in Taiwan Photon Source (TPS) by using the Robinson wigglers. The horizontal emittance of TPS is about 1.6 nm rad. In order to decrease the emittance below 1 nm rad and provide high brilliance light source for user, we develop Robinson wigglers to be installed in the short straight sections. After beam dynamics analysis, we modified the traditional (one period) Robinson wiggler to multi-period Robinson wiggler (MRW), the emittance is reduced to less 1 nm rad, but it raises the energy spread of TPS. With 2 sets of MRWs, the photon brilliance from IU22 increases by 14.8% to 34.7%. The beam dynamics effect and the design concept of special gradient insertion device will be discussed in this thesis.