The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - UNPB AU - Wong, C.Y. AU - Fukushima, K. AU - Lund, S.M. ED - Schaa, Volker RW ED - Power, Maria ED - Shiltsev, Vladimir ED - White, Marion TI - Dynamics of Beams With Canonical Angular Momentum in Non-Axisymmetric Optical Elements J2 - Proc. of NAPAC2016, Chicago, IL, USA, October 9-14, 2016 C1 - Chicago, IL, USA T2 - North American Particle Accelerator Conference T3 - 3 LA - english AB - Magnetized beams emerging from electron cyclotron resonance (ECR) ion sources have large statistical canonical angular momentum that substantially alters the beam dynamics. This paper examines the single-particle dynamics of such beams in non-axisymmetric lattice elements. The work supports commissioning activities at the FRIB Front End by illustrating how xy projections of the components of a multi-species beam become tilted due to dipoles and quadrupoles, which can complicate charge state selection with slits. The results help guide simulations performed using the PIC code WARP to achieve better optimization of the collimation in the charge selection system (CSS). Beam statistical angular momentum also evolves in the CSS which in turn changes the x- and y-plane emittances. Possible implications of this effect on the final thermalized beam emittances delivered by the Front End are discussed. PB - JACoW CP - Geneva, Switzerland ER -