Applications of an MPI Enhanced Simulated Annealing Algorithm on nuSTORM and 6D Muon Cooling

Abstract

The nuSTORM decay ring is a compact racetrack storage ring with a circumference ~480 m using large aperture ($$\phi$$ = 60 cm) magnets. The design goal of the ring is to achieve a momentum acceptance of 3.8 $$\pm$$10% GeV/c and a phase space acceptance of 2000 $$\mu$$m·rad. The design has many challenges because the acceptance will be affected by many nonlinearity terms with large particle emittance and/or large momentum offset. In this paper, we present the application of a meta-heuristic optimization algorithm to the sextupole correction in the ring. The algorithm is capable of finding a balanced compromise among corrections of the nonlinearity terms, and finding the largest acceptance. This technique can be applied to the design of similar storage rings that store beams with wide transverse phase space and momentum spectra. We also present the recent study on the application of this algorithm to a part of the 6D muon cooling channel. The technique and the cooling concept will be applied to design a cooling channel for the extracted muon beam at nuSTORM in the future study.