[en] The results obtained during the first stage of an experimental program on the study of plasma focus neutron emission are presented. The measurements were performed on two plasma focus devices having maximum stored energies of 4 kJoule and 20 kJoule, respectively. By carrying out correlated measurements on the neutron emission (using scintillator-photomultiplier and Geiger-Muller counters), on the hard X-ray emission and on the discharge current, some conclusions regarding the possible mechanism responsible for the neutron emission in these devices have been drawn. Neutron energies in the range 1.5-3 MeV have been determined; typical neutron yields are 10⁶ neutrons/pulse (at 3.2 kJoule) and 10⁸ neutrons/pulse (at 10 kJ) for the two devices operating in deuterium. (author)

[en] The uses of plasma focus device as one source for ion irradiation. Several samples have been tested for ion irradiation. As the various types of materials and sample forms, a sample holder system have been designed to suit the need. (author)

[en] Experimental results on the energetic characteristics of the plasma focus ionic component, produced in the IPF 2/20 device are presented. For energies greater than approximate 50 keV the energy distributions of the ions emitted forward are well fitted by the exponential function exp(-E/B), where the medium value of B is 48 keV. Most of the distributions have a maximum in the energy range 25-47 keV. (authors)

[en] The plasma focus device functions as a multi-radiation source by accelerating and compressing the plasma produced. Irradiation of bacteria with Malaysian Nuclear Agency-Plasma Focus has never been conducted. Thus, various operation parameters are unknown. This study aims to determine the feasibility of using certain types of tube and number of shots to conduct irradiation of bacteria. Two types of tubes were irradiated: microcentrifuge tubes (Axygen) 1.5 mL with snap cap and conical-bottom and microcentrifuge tubes (SSL) 2.0 mL with screw cap and skirted-bottom. Voltages of 11.5 kV was applied. Also, comparisons were made between tubes given 1 shot and 2 shots during the same irradiation session. All changes to colour and material of tubes were observed. Microcentrifuge tubes 1.5 mL with snap cap and conical-bottom were damaged more than microcentrifuge tubes 2.0 mL with screw cap and skirted-bottom. Durability of tubes will decrease with increasing number of plasma shots given. In conclusion, it was determined using microcentrifuge tubes 2.0 mL with screw cap and skirted-bottom and only 1 shot of plasma to be feasible for bacteria culture irradiation. Further studies will be conducted to support this preliminary study. (author)

[en] This paper is devoted to study the characteristic of plasma pinch in Malaysian Nuclear Agency Plasma Focus plasma focus device (MNA-PF) correlated with the various charging voltage with 2 mbar argon gas pressure given. The capacitor charging voltage range varies from 11.5 kV up to 13 kV. Along this range there will be the most optimum operating capacitor voltage for the MNA-PF device. At this optimum range the highest intensity of x-ray will be produced. (author)

No abstract available

[en] Results are presented from experimental studies of the plasma flows generated in the KPF-4 Phoenix Mather-type plasma focus device (Sukhum Physical Technical Institute). In order to study how the formation and dynamics of the plasma flow depend on the initial distribution of the working gas, a system of pulsed gas puffing into the discharge volume was developed. The system allows one to create profiled gas distributions, including those with a reduced gas density in the region of plasma flow propagation. Results of measurements of the magnetic field, flow profile, and flow deceleration dynamics at different initial distributions of the gas pressure are presented.

[en] A plasma focus device has been constructed and tested for producing a high dense plasma. The system was feeded by maximum 3.3 kJ., capacitor bank, which delivers 200KA. With average period 11 μS. The results show that the time at which the first focus starts increases with raising the gas pressure while it was decreased with increasing the charging voltage. The verification of snow-plow model was acheived only at a charging voltage of 14 kV. up wards. (author)

[en] A preliminary measurement of neutron emission by a repetitive Plasma focus is presented. The device (1200 nF, 40nH, 30 kV, T/4 ? 400 ns) works with Deuterium at a pressure of 9.2 mbar with a repetition rate from 3 to 6Hz. Neutron radial emission of (1.32 ± 0.21) x107 and an axial emission of (2.08 ± 0.34) x107, for each burst of 5 seconds of duration, i.e. 15 to 30 shots per burst

[en] The purpose of the present talk is to give the most important results concerning plasma focus research at the Centre d'Etudes de Limeil. At first we will describe the structure of the current sheath during the axial propagation. Then we will speak about the singularity phase and the associate turbulent resistivity which comes before the beam phase. And we will see that plasma focus can be considered as the most powerful ion beam generator