Procedure of measuring the longitudinal emittance of electron beam

2nd Conference on Plasma & Laser Research and Technologies

Yu Vladimirov, I.Y.^1

Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow

119991, Russia^1

关键词: Beam spot;    Electron motion;    Horizontal bending;    Longitudinal emittance;    Measuring systems;    Phase portrait;    RF cavities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012084/pdf
DOI  :  10.1088/1742-6596/747/1/012084

来源: IOP

【 摘 要 】

The procedure of measuring the longitudinal emittance of electron beam generated by RF gun and reconstruction of its longitudinal phase portrait is proposed. Measuring system consists of vertical deflecting RF cavity, horizontal bending dipole and screen. The beam spot on the screen is used to reconstruct the longitudinal phase portrait. In the proposed procedure an electromagnetic field of the vertical deflecting RF cavity can be approximated by the TM110mode of pillbox cavity. This approximation allows analytically solve the motion equations of the electron motion in the vertical deflecting RF cavity. The report contains description of the vertical deflecting RF cavity and the dipole, the formulae underlying the procedure and the results of numerical simulation.