Focusing of a Relativistic Electron Beam With a Microfabricated Quadrupole Magnet

Abstract

We show in this work the first reported results of relativistic electron beam focusing using a microfabricated device. The application of microfabrication to beam physics responds to a need in the particle accelerator community for miniature, economical components that can be used in a range of diverse applications ranging from nanofabrication to electron beam therapy. Quadrupole magnets, like the device described in this paper, are essential parts of any accelerator. We demonstrate beam focusing of a relativistic (3.2 MeV) electron beam, and further show that vertical steering errors can be corrected by modifying the current in the device instead of re-alignment. We also present magnetic field data that show better than 3% agreement with simulation.