A quasi-optical transmission line for the ECR ion source

A compact, efficient, 45GHz/20KW quasi-optical transmission line consisting five quasi-optical mirrors for the ECR ion source, which constructed by the Institute of Modern Physics (IMP), Chinese Academy of Science has been proposed. A computer code for vector analysis of the electromagnetic fields in mirror systems has been developed in terms of the vector diffraction theory. Based on Stratton-Chu formula and mirror optimization program, the structure of the five quasi-optical mirrors has been obtained. The simulation results show that the power transmission efficiency from the output of the Matching Optical Unit (MOU) to the vacuum widow which connected with superconducting ECR ion source is 93.53%. The experimental results indicate that a good agreement between measurement and theoretical prediction is obtained.