Energy and Angular Distributions of High-Energy Nitrogen Ion of Plasma Focus Device SBUMTPF1 by Aluminum Filters Coated on Polycarbonate Nuclear Track Detector

Abstract

The main objective of this study is to determine energy distribution and angular distribution of nitrogen ions produced in plasma focus device SBUMTPF1 measured with polycarbonate nuclear track detector. To achieve this goal, the detectors were covered by different thicknesses of aluminum filters, using physical vapor deposition method and by coated films the anisotropic distribution of nitrogen ions was investigated. For determination of nitrogen ion energy distribution, the detectors were settled in the distance of 21.5 cm and in 0° angle to the end of anode and for determination of angular distribution of ions, 1,200 nm aluminum coated detectors in 10 cm distance and at angles of 0°, 15°, 30°, 45° and 60° with respect to the anode were used. For better ion detection, a pinhole of 200 μ was used for energy distribution measurement and a pinhole of 500 μ was used for angular distribution measurement. In all experiments electrical discharges were done in the voltage of 23 ± 0.5 kV and nitrogen with the pressure of 0.5 mbar was used as working gas. By using SRIM code, the ranges of nitrogen ions were measured in aluminum. SBUMTPF1 angular distribution curve show a peak at a 30° angle against the anode axis. Besides, the suitable thickness range of aluminum filter for data registration was from 1,240 to 2,620 nm.