• D. Gorelov, V. Andreev, S. Chouhan, X. Wu, R.C. York
  NSCL, East Lansing, Michigan

Funding: Work was supported by DOE grant DE-FG02-04ER41324
The proposed Facility for Radioactive Ion Beams (FRIB)* will deliver up to 400 kW of any stable isotope to multi-target experimental complex. Operational efficiency will be best served by a system that can distribute the beam current, variable in a large dynamic range, to several independent targets simultaneously. The proposed FRIB Beam Switchyard (BSY) utilizes an rf kicker with subsequent magnetostatic septum system to split the beam on micro-bunch to micro-bunch basis. The micro-bunches can be differentially loaded at the front-end of the Driver Linac**. The detailed analysis of the beam dynamics performance in the proposed BSY system is presented.

*D.Gorelov, et al, proc of EPAC 2002, Paris, France, 2002.
**M. Doleans, et al, LINAC 2006, Knoxville, TN, USA, 2006.

• Q. Zhao, V. Andreev, J. Brandon, G. Machicoane, F. Marti, J.C. Oliva, J. Ottarson, J.J. Vincent
  NSCL, East Lansing, Michigan

To meet the requirement of a small output longitudinal beam emittance from the reaccelerator, a triple-harmonic buncher operating at the fundamental frequency of 80 MHz upstream the Radio Frequency Quadrupole (RFQ) linac has been designed, manufactured and tested at the National Superconducting Cyclotron Laboratory (NSCL). The buncher consists of two coaxial resonators with a single gridded gap. One cavity provides both the fundamental and the third harmonic simultaneously with l/4 and 3l/4 modes respectively, while the other for the second harmonic with a l/4 mode. This buncher combines the advantages of using high quality factor resonator and only a pair of grids. Details on design considerations, electromagnetic simulations, and test results are presented.