Abstract
Accelerator is an instrument that accelerates charged particle to a desired energy. In general a circular accelerator has three main parts: booster, storage ring and transfer line. A booster is a synchrotron. Which accelerates the electron beam to a desired energy and then extract these electrons to the storage ring through a transfer line. Synchrotron light source is a circular accelerator, which stores electron beam and creates photons by the centrifugal acceleration of electrons at the bending magnets. The goal of a synchrotron light source is to provide high brilliance photon beam for scientific research. High brilliance photon beam can only be generated by electron beam of small emittance. Beam emittance is the area occupied by particles in the phase space. Thus, making the beam emittance of the storage ring as small as possible is very important in designing a storage ring. To provide small emittance beam in the storage ring, the booster also needs to be designed with a small beam emittance. I try to design a small booster with circumference about 150m. The electron beam would be accelerated from 150MeV to 3GeV. Combined function FODO lattice is used for the booster to reduce the circumference. Nature chromaticity and eddy current effect are corrected by the sextupole field in combined function magnets. For beam stability the higher order magnetic fields should be keep small and the working tune should stay away from the resonance line. I scan the working tune and track the electron dynamics in phase space and find a solution with good dynamic aperture. The closed orbit distortion due to engineering imperfection could be corrected to make the particle trajectory stable. After ramping to the desired energy, the electron beams will be extracted and delivered to the storage ring. There are a fast kicker, four bumpers and two septum magnets in the design to extract electron beams from the booster. The extracted beam traverses through a transfer line, which connects the booster and the storage ring. The closed orbit distortion in the transfer line is corrected by correction magnets. Then, the electron beams are injected to the storage ring. The design of a booster and a transverse line which meet the design requirement of storage ring has been achieved.