Variants of optics schemes and accelerator configurations for the Athens microtron: preliminary considerations

The IASA Continuous Wave Race Track Microtron will be built from the components of 185 MeV/550 /spl mu/A NIST/LANL research RTM project. The original NIST CW RTM was designed as 15 linac passages accelerator with increase in orbit circumference per turn v=2, 12 MeV synchronous energy gain per turn and quadrupole doublets on each return path. Being outstanding in a number of projected parameters this well-developed design differs by complexity of accelerator tuning connected with chose injection scheme and beam optics. Nuclear physics experiments planned for IASA RTM requires an increase of output beam energy to about 250 MeV, which cannot be achieved with the original design. By this report, we present the results of comparative study of the original design with other possible variants that can be realized with NIST RTM equipment and which differ in accelerator configuration and beam optics.