CERN Accelerating science

Article
Title	Heavy-Ion Beam Dynamics in the RIA Post-Accelerator
Author(s)	Ostroumov, Peter ; Aseev, Vladislav N ; Kolomiets, Andrej
Affiliation	(ANL, Argonne, Illinois) ; (ITEP, Moscow)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3301
Subject category	Accelerators and Storage Rings
Abstract	The RIB linac includes two strippers for the heaviest ions and three main sections: a room temperature injector up to an energy of  100 keV/u, a superconducting (SC) linac for ions with charge-to-mass ratio 1/66 or more up to an energy of  1 MeV and a higher energy SC linac to produce 10 MeV/u beams up to the mass of uranium. The RIA post-accelerator is a complex system designed for acceleration singly-charged ions before the stripper and includes many different accelerating and focusing structures operating both at room and cryogenic temperatures. Extensive accelerator design studies and end-to-end beam dynamics simulations have been performed to minimize the cost of the linac while providing high-quality and high-intensity radioactive beams. Specifically, we have found that cost-effective acceleration can be provided by several hybrid RFQs in the front end. The hybrid RFQs have been proposed and developed for acceleration of low-velocity heavy ions.* For the beam focusing in the second section it is appropriate to use electrostatic lenses and SC quadrupoles inside common cryostats with the resonators. The electrostatic lenses are most effective in the first cryostat of the SC linac.