A Large Acceptance Pion Channel for Cancer Therapy,

摘要

The design of a large acceptance superconducting toroidal pion channel with solid angle greater than 1sr and momentum acceptance of several percent is presented. Measurements of characteristics of negative pion production with an electron beam including thick target cross sections,electron and muon beam contaminants,and neutron and gamma ray backgrounds are described. These parameters are used to define a pion channel configuration with desirable properties for use in the radiation therapy of cancer. The method of computer design of the magnetic fields and calculation of pion trajectories is discussed along with a description of momentum and spatial resolution effects. Further discussion is included with respect to the specific engineering design problems of the winding configuration,cryogenic system,radiation damage,and the multiple momentum defining slit system.