Improved multichannel neutron polarizers on basis of CoFeV/TiZr supermirrors with TiZrGd underlayer

Abstract Measurements of the polarizing efficiency and transmittance of a new high-efficiency multichannel neutron polarizer are presented. The procedure of the measurements is given. The parameters of new Fe 30 Co 68 V 2 /Ti 75 Zr 25 supermirrors and a polarizer made of them are compared with old Fe 34 Co 64 V 2 /Ti 60 Zr 40 supermirrors and an old polarizer. We discuss how the polarizing efficiency of the coating was improved.