Three-dipole kicker injection scheme for the Advanced Light Source upgrade accumulator ring

The Advanced Light Source Upgrade will implement on axis single-train swap-out injection employing an accumulator between the booster and storage rings. ring (AR) design is a twelve period triple-bend achromat that be installed along inner circumference of storage-ring tunnel. A nonconventional scheme utilized for top-off off from into AR meant to accommodate large $\ensuremath{\sim}300\text{ }\text{ }\mathrm{nm}$ emittance beam vacuum-chamber with limiting horizontal aperture radius as small 8 mm. incorporates three dipole kickers distributed over sectors, two perturbing stored third affecting both injected trajectories. This paper describes this ``3DK'' how it fits AR's particular requirements. We describe optimization process, we evaluated its fitness solution booster-to-accumulator injection.