Effect of the Gap Size between the Cathode and the Wehnelt Cylinder Bore on the Emittance of the Thermionic Electron Gun. Iraqi Journal of Science [Internet]. 2022 Aug. 31 [cited 2024 May 4];63(8):3382-9. Available from: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/4981