The Faraday cup geometry used in simulations. The secondary electron source is also shown in this figure.
The variation of the escape factor versus the cup aspect ratio.
The secondary electron escape factor versus incoming ion energy for different cup bias voltages resulted from the CST simulations.
The image of the designed and constructed Faraday cup.
Schematic diagram of the Sahand plasma focus device with the Faraday cup on the axis and PIN diode at the right angle of the cathode normal.
Schematic diagram of Faraday cup external circuit used in the experiment.
Typical signals of dI/dt, X-ray, and ion beams (recorded by FC) at the working pressure of 0.25 Torr. The FC is biased to −100 V.
The peak of the ion signal and number flux per solid angle versus the applied bias voltage.
SEE coefficient, γ, as a function of ion energy.
The equilibrium to initial charge state of the argon ions, traveling the distance of 50 cm in the argon, as a function of the ion energy using the semi-empirical formula.
Trajectories of ion transmission through the 5 μm mylar using TRIM code.
(a) Typical signals of PIN diode, current derivative and filtered FC (b) transmission of X-ray through the mylar.
Stopping power effect on the argon ion travelling 50 cm through the 0.25 Torr argon gas. (a) ion final energy and (b) ion range as a function of ion initial energy.
The measured energy spectrum of the argon ions for different working gas pressures, taking into account the corrections related to ion stopping power and charge exchanges.
The measured energy spectrum of the argon ions for different bank voltages taking into account the corrections related to ion stopping power and charge exchanges.
Characteristics of the designed and constructed Faraday cup.
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