Preliminary Results of the 115 kJ Dense Plasma Focus Device IR-MPF-100

Abstract

This work summarizes the design and construction of the first Iranian 115 kJ Mather type plasma focus (PF) machine (IR-MPF-100). This machine consists of a 6.25 cm radius and 22 cm height brass made anode with a 50 mm height insulator which separates the anode and cathode electrodes. Twelve copper made 22 cm height rods play the role of cathode with 10.2 cm radius. Twenty four 6 lF capacitors were used with the maximum charging voltage of 40 kV (maximum energy of 115 kJ) as the capacitor bank and maximum theoretical current around 1.224 MA. The total inductance of the system is 120 nH. By using NE-102 plastic Scintillator, Rogowski coil, current and voltage probes, hard X-ray, current derivative, current and voltage signals of IR-MPF-100 were measured. The primary result of neutron detection by neutron activation counter represents approximately 10 9 neutrons per shot at 65 kJ discharge energy while using deuterium filling gas. Also IR-MPF-100 PF has been tested successfully at 90 kJ by using the argon gas.

MCNP Dose Analysis for the Iranian Plasma Focus Neutron Source

“…The IR-MPF-100, which in the present study is considered as the neutron source has been designed and constructed recently [5]. This machine consists of a 6.25 cm radius and 22 cm height brass made anode which has a tapered configuration.…”

“…In order to measure the neutron emission a Geiger-Muller activation counter detector covered by Ag foil and placed at 130 cm vertically from top of the anode has been utilized. The primary result of neutron detection by neutron activation counter represents approximately 10 12 neutrons of 2.45 MeV per shot at 115 kJ maximum discharge energy while using deuterium filling gas of operating pressure 7.7 torr [5]. If we consider the neutron production just as a result of fusion reactions, one should expect an isotropic emission of neutrons, whereas many experimental results proved that the emission of neutrons is higher at axial direction than at the radial direction and cannot be considered as an isotropic emission [6].…”

Fabrication of three-dimensional micro-Rogowski coil based on femtosecond laser micromachining

“…The microwire could meet the growing requirements of highly integrated microcircuit, which would improve the integration level of the microdevices and reduces the size of the microsystems effectively. The microcoil sensors are usually used as inductors to enhance radio-frequency (RF) response signals and created magnetic fields to improve imaging capability in magnetic resonance imaging (MRI) systems and various types of advanced electromagnetic microsensors and microactuators [4][5][6].…”

“…Rogowski coil is a special kind of helical coil sensor, which can measure the current with high values and even the transient current of pulses as short as several nanoseconds [6][7][8]. Micro-Rogowski coil is a key device with typically complex three-dimensional (3D) metal microstructures in developing miniaturized current measurement system [9,10].…”

Numerical experiments on neutron yield and soft x-ray study of a ∼100 kJ plasma focus using the current profile fitting technique

“…The scaling was found to be Y SXR ∼ I 4.1 pinch for high-inductance plasma focus (270 nH) and Y SXR ∼ I 4.9 pinch for low-inductance plasma focus (10 nH). Recently, the preliminary results of a newly built 115 kJ IR-MPF-100 plasma focus device were presented by Salehizadeh et al [14]. The device consisted of a brass anode 22 cm in length with a radius of 6.25 cm.…”