Design of a New Faraday Cup to Measure the Beam Current of an Ion Source with Residual Gas

Different parameters affecting the faraday cup (FC) performance are investigated. It is shown that the FC design depends on the incident particle beam parameters. If FC is used to measure the beam current of a dense plasma focus device or if FC is used to measure the beam current of an ion source where there is residual gas, it should allow the secondary electrons to escape from the cup. Then the effect of the escaped electrons must be estimated somehow. Otherwise, to ease the calculations, FC should be designed to recapture the secondary electrons. Here, we propose a novel FC to measure the particle beam current of an ion source where residual gas or electromagnetic noise exists. To obtain precise beam current measurement, FC performance is simulated by CST Studio soft ware. In addition, a method is proposed for the analysis of the FC signals.