Abstract
The concept of using a single nonlinear kicker (NLK) to inject electron beams into a storage ring has been proposed and tested in several synchrotron radiation light source facilities. Different from pulsed dipole kicker magnets used in a conventional local-bump injection, the single nonlinear kicker provides a nonlinear distribution of magnetic fields which has a maximum value off axis where the injected beam arrives and a zero or near-zero value at the center where the stored beam passes by. Therefore, the injected beam will receive a kick from the NLK and lose its transverse momentum, and will be eventually captured by the storage ring. In the meantime the stored beam at the center will receive no kick or less kick, which significantly reduces the injection perturbations on the stored beam. In addition, the NLK injection requires less space for the kicker and removes the complications of synchronizing four pulsed kicker magnets. Because of these advantages, several light source facilities are either proposing or already using this NLK injection as a replacement of the conventional local-bump injection scheme. In this paper, we will discuss the working principal of this NLK injection, and use both Advanced Light Source and Advanced Light source Upgrade as examples to optimize the NLK injections. By optimizing the NLK design and injection conditions, we could achieve maximum injection efficiencies for both facilities with a large injected beam from the existing ALS booster.
Highlights
For most existing or future synchrotron radiation light source facilities, the top-off operation is a standard mode of operation for a storage ring to provide a constant electron beam current to users without injection interruption [1]
An injected beam is kicked by the pulsed multipole magnet (PMM) off-axis and captured into the ring acceptance by damping while the stored beam passes through the center of the PMM where the magnetic field is almost zero
III and IV, we present the nonlinear kicker (NLK) injection optimizations for both Advanced Light Source (ALS) and Advanced Light Source Upgrade (ALS-U) to achieve maximum injection efficiencies
Summary
For most existing or future synchrotron radiation light source facilities, the top-off operation is a standard mode of operation for a storage ring to provide a constant electron beam current to users without injection interruption [1]. In Japan [2,3] In this method, an injected beam is kicked by the PMM off-axis and captured into the ring acceptance by damping while the stored beam passes through the center of the PMM where the magnetic field is almost zero. An injected beam is kicked by the PMM off-axis and captured into the ring acceptance by damping while the stored beam passes through the center of the PMM where the magnetic field is almost zero This method allows us to inject an electron beam into a storage ring without a large perturbation on the stored beam during the top-up operation. The injected beam receives a maximum kick from the NLK and the stored beam will receive much less perturbations This nonlinear magnetic field distribution can be created by eight conductors symmetrically located in four quadrants of a transverse space.
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