Simulation Study of Three-Dimensional Laser Cooling Method for Fast Stored Ion Beams (NUCLEAR SCIENCE RESEARCH FACILITY?Beams and Fundamental Reaction)

Abstract

Two superconducting RFQs (SRFQ1 and SRFQ2) have been developed in INFN-LNL. The output beam energy is 578.3 keV/nucleon for 28+U238. The SRFQ1 was designed based on the 90o-apart-stem structure and the RF characteristics were measured on the half scale model. The important decision in the design is to split the cavity into two sections because the electrode length of SRFQ1 is too long to perform the electron beam welding with the available machine. The field variation within ±1 % is achieved even after the splitting.