High-precision pepper-pot technique for a low-emittance electron beam

Abstract An emittance measurement system employing a high-precision pepper-pot technique has been developed for an electron beam with low emittance, less than π mm mrad. Since luminous spots on a scintillator are very small, each one was magnified and observed individually with high spatial resolution by scanning an optical system mounted on a precise movable platform. The beam from a high-brightness electron gun was evaluated using this system.