DOI: 10.36347/sjet

Pages: 360-366

A design of 2.2 kJ plasma focus (PF) device has been constructed using a set of four capacitors which are connected in parallel and has capacity of (30.84μf) and charged with voltage (12kV). This device was operated in various gases; Helium, Argon and Nitrogen in the range of pressure from 0.2 to 3.6 torr. Exchanging the Teflon flat insulator with the Pyrex glass tubular insulator between the two coaxial electrodes surrounding the inner electrode IE with a thickness 3mm and 3cm in length (effective length 25 mm from the surface of outer electrode (OE) back plate) for beam dense. Another modification was made to the discharge circuit connections to minimize the inductance of the circuit across the length of the coaxial cables has length of 2 meter and a number 0f 20 cables which are connected in parallel compared to the previous set up of the device. The optimum operating pressures have been established for each gas type under consideration in this work. We get a good focusing from this device with best spike voltage of 4.5 kV for nitrogen gas at the time of the first peak of current (TImax) with pressure of 0.35 torr, 2 kV for argon at time (TImax) with pressure of 0.3 torr and 1kV for helium at time (TImax) with pressure ranged between (o.3 torr). The discharge current has a maximum value of 180 kA at pressure of 1.2 torr, 170 kA at pressure of 0.5 torr and 120 kA at pressure of 0.2 torr for helium, argon and nitrogen gas respectively.