Non-Linear Beam Transport for the Lens 7 MeV Proton Beam

A beam transport system has been designed to carry a high-intensity low-emittance proton beam from the exit of the RFQ-DTL acceleration system to the neutron production target of the Indiana University Low Energy Neutron Source (LENS). [1] The goal of the design was to provide a beam of uniform density over a 6cm by 6cm area at the target. Two octupole magnets [2] are employed in the beam line to provide the necessary beam phase space manipulations to achieve this goal. First order calculations have been performed using TRANSPORT [3] and second order calculations have been performed using TURTLE. [4] Second Order calculations have been done using both a Gaussian beam distribution and a particle set generated by calculations of beam transport through the RFQ-DTL using PARMILA. [5] Preliminary performance results for the beam transport system will be discussed.