An improved design of Faraday cup detector to reduce the escape of secondary electrons in plasma focus device by COMSOL

Faraday cup (FC) is a beamline diagnostic which is used to measure the total charge of pulsed beams. The reliable operation of an FC depends on its ability to recapture the ejected electrons when energetic particles strike with interior cup(IC) of an FC. In this paper COMSOL multi-physics software is used to investigate the performance of two new proposed FCs. The FC with A = 40 mm and B = 98 mm had better efficiency in contrast with traditional FC geometries.

► COMSOL multi-physics software is used to study the trajectory of secondary electrons on the axis of different FCs.
► Four types of IC with different geometries are proposed and these structures are compared with the best beveled FC.
► The FC with A = 40 mm and B = 98 mm had better efficiency in contrast with traditional FC geometries.