Production of intense positron beams at the VEPP-5 injection complex

Abstract

A source of positrons allowing 5 × 10 8 positrons accelerated to the energy of 70 MeV to be produced per pulse has been developed. The process of electron-positron pair production in an electromagnetic shower is used for production of positrons. The electromagnetic shower is generated in a tantalum target by a beam of 2 × 10 10 electrons with energy 270 MeV. A high efficiency of positron collection (positron yield Y ≈ 0.1 GeV −1 ) is ensured by a unique design of the matching device.