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- Pinched plasma (3)
- Anisotropy factor (2)
- Confinement time (2)
- Dusty plasma (2)
- Plasma focus (2)
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- Activity measurements (1)
- Boiler moving model (1)
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- Current and current derivative (1)
- Current and current derivative profiles (1)
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- Dense plasma focus (1)
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- Filippov-type plasma focus (1)
- Fringe shift density (1)
- Graphite target (1)
- High energy protons (1)
- IR-MPF-100 Int (1)
- Impurity ions (1)
- Laser interferometry (1)
- Lattice pitch (1)
- Mather type plasma focus device (1)
- Moderator-to-fuel ratio (1)
- Moving boiler model (1)
- Multiplication factor (1)
- N-13 production (1)
- Neutron production mechanisms (1)
- Non-thermal mechanism (1)
- PET (1)
- Paul ion trap (1)
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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Paul Ion Trap As A Diagnostic For Plasma Focus, S.M. Kiai, .. ., Ahmad Talaei, Et Al.
Paul Ion Trap As A Diagnostic For Plasma Focus, S.M. Kiai, .. ., Ahmad Talaei, Et Al.
Ahmad Talaei
The plasma discharge contamination by high and low Z Impurities affect the rate of nuclear fusion reaction products, specially when light particles have to be confined. These impurities should be analyzed and can be fairly controlled. This paper reports on the development of a Paul ion trap with ion sources by impact electron ionization as a diagnostic for the 10 kJ Iranian sunshine plasma focus device. Preliminary results of the residual gas are analyzed and presented.
Preliminary Results Of Is Plasma Focus As A Breeder Of Short-Lived Radioisotopes 12c(D,N)13n, S.M. Kiai, . ., Ahmad Talaei, Et Al.
Preliminary Results Of Is Plasma Focus As A Breeder Of Short-Lived Radioisotopes 12c(D,N)13n, S.M. Kiai, . ., Ahmad Talaei, Et Al.
Ahmad Talaei
Modified IS (Iranian Sun) plasma focus (10 kJ,15 kV, 94 μF, 0.1 Hz) has been used to produce the short-lived radioisotope 13N (half-life of 9.97 min) through 12C(d,n)13N nuclear reaction. The filling gas was 1.5–3 torr of hydrogen (60%) deuterium (40%) mixture. The target was solid nuclear grade graphite with 5 mm thick, 9 cm width and 13 in length. The activations of the exogenous target on average of 20 shots (only one-third acceptable) through 10–13 kV produced the 511 keV gamma rays. Another peak found at the 570 keV gamma of which both was measured by a NaI portable …
Plasma Focus Device As A Breeder Of 14.66 Mev Protons To Produce Short-Lived Radioisotopes, A. Zaeem, S.M. Kaia, M. Sedaghatizadeh, Ahmad Talaei
Plasma Focus Device As A Breeder Of 14.66 Mev Protons To Produce Short-Lived Radioisotopes, A. Zaeem, S.M. Kaia, M. Sedaghatizadeh, Ahmad Talaei
Ahmad Talaei
In plasma focus devices filled deuterium gas with low pressure admixture gas, 3He, the deuterium creates high energy protons of 14.66 MeV through the 3He(d, p) 4He(Q = 18.35 MeV) fusion reaction. This reaction takes place due to the thermal and non-thermal (beam-target) mechanisms. The proton yield production for deuterium filling gas is determined by using the beam-target character of the pinched plasma and moving boiler model. If we use a low pressure admixture gas like 11B, these high energy protons in turn, could generate short-lived radioisotopes like 11C (used in positron emission tomography) via the …
Influence Of Admixture Gas On The Enhancement Of Neutron Production In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia
Influence Of Admixture Gas On The Enhancement Of Neutron Production In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia
Ahmad Talaei
In this article, considering the most important interactions between the ionized admixture particles and the working plasma ones, we have analyzed the effect of added gas on the current and confinement time of the pinched plasma in plasma focus devices. Moreover, we demonstrate how heating and cooling the pinched plasma can be controlled by the increase and decrease on the percentage of the added particles and by this way the rise in the rate of D–D nuclear reactions is calculated.
Theoretical Study Of The Endogenous Production Of N-13 In 115 Kj Plasma Focus Device Using Methane Gas, Saeedeh Haghani, A. Sadighzadeh, Ahmad Talaei, A. Zeem, S.M. Kiai, A. Heydarnia, V. Damideh
Theoretical Study Of The Endogenous Production Of N-13 In 115 Kj Plasma Focus Device Using Methane Gas, Saeedeh Haghani, A. Sadighzadeh, Ahmad Talaei, A. Zeem, S.M. Kiai, A. Heydarnia, V. Damideh
Ahmad Talaei
Mather type plasma focus device with the bank energy of 115 kJ (40 kV, 144μF) was studied for induced activity of N-13; a short-lived radioisotope β+ emitter with 511 keV of gamma rays and has a half-life of t1/2 = 9.93 min through 12C (d, n)13N nuclear reaction. N-13 radioisotope is used in Positron Emission Tomography (PET) for imaging and treatment. In this paper endogenous production of 13N is considered. It is shown by adding 3–4 % CH4 to the chamber, the induced activity of N-13 has increased about 4 %. Our study is representative of producing 106 − 109 …
Study The Output Characteristics Of A 90 Kj Filippove-Type Plasma Focus, S.M. Kiai, Ahmad Talaei, Et Al.
Study The Output Characteristics Of A 90 Kj Filippove-Type Plasma Focus, S.M. Kiai, Ahmad Talaei, Et Al.
Ahmad Talaei
The output characteristics of a Filippove-Type plasma focus “Dena” (288 μF, 25 kV, 90 kJ) is numerically investigated by considering the voltage, current, current derivative, and maximum current as a function of capacitor bank energy in the constant Argon gas pressure and compared to the experiment. It is shown that increase on the bank energy leads to the increment on the maximum current and decrement on the pinch time.
Effects Of Admixture Gas On The Production Of 18f Radioisotope In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia, A. Zeem
Effects Of Admixture Gas On The Production Of 18f Radioisotope In Plasma Focus Devices, Ahmad Talaei, S.M. Kaia, A. Zeem
Ahmad Talaei
In this article, the effect of admixture gas on the heating and cooling of pinched plasma directly related to the enhancement or reduction of 18F production through the 16O(3He, p)18F is considered in the plasma focus devices. It is shown that by controlling the velocity of added Oxygen particles mixed with the working helium gas into the plasma focus chamber, one can increase the current and decrease the confinement time (plasma heating) or vice verse (plasma cooling). The highest level of nuclear activities of 18F was found around 16% of the Oxygen admixture …
Study The Influence Of The Bank Energy On The Dynamical Pinch In Plasma Focus, Ahmad Talaei, S.M. Kaia
Study The Influence Of The Bank Energy On The Dynamical Pinch In Plasma Focus, Ahmad Talaei, S.M. Kaia
Ahmad Talaei
The plasma focus discharge can generate, accelerate and pinch the plasma up to high density and temperature in a pulsed mode manner. Applications aspects of discharge require high efficiency of the fusion products. This situation acquires optimized operational parameters for the proper discharge. In this article, we have studied the plasma parameters and neutron performance dependency on bank energy. First, analytical expressions are derived from the equation of motion for the plasma particles in the radial phase. Then, the related fusion neutrons, both thermal and non-thermal, together with the discharge anisotropy in the low pressure regimes for the ‘Dena’ plasma …
Pinched Plasma Study In A Filippov-Type Plasma Focus “Dena”, Ahmad Talaei, S. Kaia, S. Adlparvar
Pinched Plasma Study In A Filippov-Type Plasma Focus “Dena”, Ahmad Talaei, S. Kaia, S. Adlparvar
Ahmad Talaei
A characteristic feature of physical processes occurring in pinched plasma is their tendency to generate thermal and nonthermal emissions. In this case, the roles played by plasma compression dynamics such as pinch formation, pinch disruption, expansion, etc., are predominant. In this paper, first, we present some of the experimental results concerning the thermal and nonthermal neutron emissions. Then, a new approach based on some theoretical assumptions and the experimental data for which the pinched plasma density evolution was studied are introduced. In the new approach, the compression dynamics are divided into two phases: plasma compression (thermal) and plasma expansion (nonthermal). …
Development Of Practical Method Using A Monte Carlo Code For Evaluation Of Optimum Fuel Pitch In A Typical Vver-1000 Core, Navid Taheranpoura, Ahmad Talaei
Development Of Practical Method Using A Monte Carlo Code For Evaluation Of Optimum Fuel Pitch In A Typical Vver-1000 Core, Navid Taheranpoura, Ahmad Talaei
Ahmad Talaei
In this work, we developed a practical method to evaluate the optimum moderator-to-fuel ratio of a typical VVER reactor using a Monte Carlo code. To reach this aim, by analyzing the curves of the infinite multiplication factor (k∞) versus moderator-to-fuel ratio, the optimum fuel pitch is determined for different fuel diameters of the proposed fuel elements using the MCNPX code. Optimum moderator-to-fuel ratio and fuel pitch were determined from the curves where the value of k∞ is maximum for cold conditions and is located in an under-moderated region for hot conditions. Also, the void reactivity coefficient …
Investigation Of The High Pressure Regimes Effects On The Neutron Production In Plasma Focus, Ahmad Talaei, S.M. Kaia
Investigation Of The High Pressure Regimes Effects On The Neutron Production In Plasma Focus, Ahmad Talaei, S.M. Kaia
Ahmad Talaei
Effects of high pressure regimes on the thermal mechanism of neutron yield and anisotropy factor with respect to the capacitor bank energy are presented by using moving boiler model. It is found that at high pressures, the thermal fusion reactions have a considerable effect on the neutron yield and anisotropy factor. We have compared the manner of the anisotropy in two low and high pressure discharges to investigate different behavior of the anisotropy factor as a function of bank energy in the difference working regimes of pressure for Dena PF.
Viscous And Induced Current Heating In Plasma Focus Plasmoids, Ahmad Talaei, Eric Lerner
Viscous And Induced Current Heating In Plasma Focus Plasmoids, Ahmad Talaei, Eric Lerner
Ahmad Talaei
Recently, Abolhasani et al, proposed that the high ion energies observed in plasmoids formed in the plasma focus could be explained by viscous heating. We here elaborate this proposal, demonstrating that during plasmoid formation, ion motion along magnetic field lines can be rapidly converted, at least in part, to thermal energy through viscous diffusion. This effect is strongly enhanced by higher-z ions. We compare the theoretical predictions with the recent observation by Lerner et al, of trapped ion energies of 160 keV. In addition, we propose a second source of heating. The mildly relativistic electron beam emitted by the plasmoid, …