CERN Accelerating science

Article
Title	RF-Kicker System for Secondary Beams at NSCL/MSU
Author(s)	Gorelov, Dmitry ; Andreev, Vladimir ; Bazin, Daniel ; Doleans, Marc ; Grimm, Terry L ; Marti, Felix ; Vincent, John ; Wu, Xiaoyu
Affiliation	(NSCL, East Lansing, Michigan)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3880
Subject category	Accelerators and Storage Rings
Abstract	The design and construction of a radio frequency (RF) kicker system at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University (MSU) has been proposed. This RF kicker system will be used to purify secondary beams of rare isotopes after the existing A1900 Fragment Separator and will open a wide range of possibilities for new experiments at the forefront of nuclear science. The proposed system is studied as an efficient alternative to the traditional approach using Wien Filter. Rare neutron deficient secondary beams are challenging to purify because of the presence of intense contaminants that cannot be removed by the traditional energy loss method. However, velocity differences resulting in time-of-flight differences can be used for the effective separation of the beams transversely using the time-varying electromagnetic fields of the RF kicker. Its technical design will be presented together with the beam dynamics analysis of a secondary beam in realistic 3D electromagnetic fields. The expected purification improvement of the exotic beams for the foreseen nuclear physics experiments will be shown in details.