Abstract
In NSRRC narrow-bandwidth IR FEL proposal, an electron beam with high bunch charge will be injected into an energy recovered Superconducting linac system. In such situation, an intense space charge force acting on individual electrons within bunches; final beam quality will be dominated by such space charge field especially at lower energy injection. The TESLA 9-cell superconducting cavity will be used as the main linac. In this study, we will use SUPERFISH and PARMELA to study the motion of space charge dominated beams in such linac and examine the feasibility of preliminary beam parameters for the FEL. In addition to the study of the influence of space charge effect, we also examine the conditions for linac injection. The characteristic of transport system during acceleration are also studies systematically. A solenoid will be used as an element to match beam motion in the linac, with appropriate solenoid strength setting, beam matching condition can be achieved and emittance growth due to mismatching can be avoided. These results in comparison with theoretical calculation will be shown.