Fermilab FERMILAB - TM - 2138 January 2001 Double Alpha MEBT For H - Beam

This note describes simulation studies of the H beam matching condition between a 750keV rod radio-frequency quadrupole (RFQ) and the existing Fermilab drift tube linac (DTL). The RFQ design used in this study is that of an existing RFQ designed and built by A. Schempp from IAPGoethe University. It is assumed that the medium-energy beam transport (MEBT) line uses hardware built for a positron emission tomography (PET) project. The MEBT is made out of two Alpha magnets and seven quadrupoles and was designed by D. Larson. The beam from the exit of the RFQ is matched to the entrance in the DTL in all three dimensions. The study shows that up to 65mA of Hbeam can be transported and cleanly injected into the present linac. Introduction For the PET project[1] a special type of the MEBT[2] was designed and built, Figure 1. This system was used to match 1MeV single charged He beam coming from a 200MHz