Abstract
Next-generation light sources based on the multibend achromat concept place great reliance on the accuracy of beam dynamics modeling. To ensure the success of such light sources, confirmation of design performance with at least two independent codes is prudent. The APS Upgrade (APS-U) lattice has been designed using the code elegant, which has existing and new features that are needed by the design. Corresponding, independent improvements have recently been made to the accelerator toolbox (at), in order to permit an independent check of nonlinear dynamics predictions. The new developments include the modeling of combined-function bending magnets with straight geometry and improved fringe field effects of quadrupole magnets. Calculations of linear and nonlinear lattice parameters and particle tracking results were compared, showing remarkable agreement was found between the two independently developed codes. This provides significant confirmation of the feasibility of the APS-U design.
Highlights
Accurate lattice modeling is of crucial importance in storage ring lattice designs
Recent work of experimental optimization of storage ring nonlinear dynamics has led to substantial improvement in the dynamic aperture or momentum apertures [4,5,6,7], which may serve as an indication that model-based machine settings need improvement
In order to accurately model the nonlinear beam dynamics performance of next-generation storage ring light sources, new features were introduced into the lattice modeling codes ELEGANT and accelerator toolbox (AT) in two separate, independent efforts
Summary
Accurate lattice modeling is of crucial importance in storage ring lattice designs. The successful operation of a storage ring requires sufficient dynamic acceptance (DA) and local momentum acceptance (LMA) throughout the ring. Recent work of experimental optimization of storage ring nonlinear dynamics has led to substantial improvement in the dynamic aperture or momentum apertures [4,5,6,7], which may serve as an indication that model-based machine settings need improvement The requirement for high accuracy lattice modeling has increased substantially in recent years as many labs began pushing for the generation, multibend-achromat (MBA) based storage ring light sources [8,9,10]. These new rings utilize much stronger quadrupole magnets to pack many more lattice cells over the circumference as compared to a traditional third generation storage ring.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
