Heavy Ion Beam Drive Final Drift, Compression, and Focusing Design

The final drift, compression, and focusing segment of a heavy ion beam (HIB) driven inertial confinement fusion (ICF) reactor delivers the accelerated bunch of ions to the target with the required pulse length and beam spot size, in essence matching the accelerator output parameters to the desired beam parameters at the target. In this paper, we summarize the final drift, compression, and focusing design for the W.J. Shafer Associates (WJSA) Reactor Design Team's OSIRIS^1,2 HIB-driven ICF reactor. Our design rearranges the bundle of beams emerging from the linac into two vertical columns, transports each column to a beam compressor, rearranges the columns into large-diameter rings, then focuses each of the beams in the target. Rationale of the design features and description of the beamline elements are given.