Approach to the Highest HXR Yield in Plasma Focus Device Using Adaptive Neurofuzzy Inference System to Optimize Anode Configuration

Mahtab, M.; Taghipour, Mostafa; Roshani, Gholam Hossein; Habibi, M.

doi:10.1155/2014/307403

“…In this regard, the typical current oscillograms and I-V characteristic of the CPA, obtained for the two types of working gas, shown in figures 2(a) and (b). These discharge current oscillograms are in well agreement with the oscillograms presented in other studies [19,20] and represent a rapidly damping waveform. This indicates a low inductance of the system and demonstrates the fact of effective transfer of the energy stored in the capacitors.…”

Section: Resultssupporting

confidence: 90%

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Tazhen¹,

Dosbolayev²,

Рамазанов³

2022

Plasma Sci. Technol.

1

0

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Due to the growing interest in studying the compression and disruption of the plasma filament in magnetic fusion devices and Z-pinches, this work may be important for new developments in the field of controlled thermonuclear fusion. Recently, on a coaxial plasma accelerator (CPA), we managed to obtain the relatively long-lived (~300 µs) plasma filaments with its self-magnetic field. This was achieved after modification of the experimental setup by using high-capacitive and low-inductive energy storage capacitor banks, as well as electrical cables with low reactive impedance. Furthermore, we were able to avoid the reverse reflection of the plasma flux from the end of the plasma accelerator by installing a special plasma-absorbing target. Thus, these constructive changes of the experimental setup allowed us to investigate the physical properties of the plasma filament by using the comprehensive diagnostics including Rogowski coil, magnetic probes, and Faraday cup (FC). As a result, such important plasma parameters as density of ions and temperature of electrons in plasma flux, time dependent plasma filament's azimuthal magnetic field were measured in discharge gap and at a distance of 23.5 cm from the tip of the cathode. In addition, the current oscillograms and I-V characteristics of the plasma accelerator were obtained. In the experiments, we also observed the charge separation during the acceleration of plasma flow via oscillograms of electron and ion beam currents.

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“…The optimization of plasma focus devices for these applications are necessary in terms of neutron yield or x-ray productions. Therefore, neutron optimization studies [25][26][27] and x-ray optimization studies [28][29][30][31] are conducted experimentally and theoretically with different gases.…”

Section: Introductionmentioning

confidence: 99%

“…It is found that decreasing cylindrical anode length improves soft x-ray yield but using tapered anode did not improve soft x-ray yield in the device [30]. Static inductance, anode length, anode radius, and gas pressure are also investigated for neon soft x-ray yield optimization in plasma focus [31][32][33][34]. These studies show that there is an optimum gas pressure as well as an optimum static inductance when the optimum anode length and anode radius are used to increase soft x-ray yield in plasma focus.…”

Section: Introductionmentioning

confidence: 99%

Neon soft x-ray yield optimization in spherical plasma focus device

Ay

¹

2021

Plasma Phys. Control. Fusion

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A spherical plasma focus (SPF) (KPU200 (Maslov 2014 Instrum. Exp. Tech. 57 131-4)) operated with neon is used for soft x-ray optimization in this work. This device with 135 kJ stored energy has 432 µF capacitor bank, 8 cm inner and 14.5 cm outer electrode radii. Inductance and charging voltage of this device are 36 nH and 25 kV. Optimization study is conducted with a spherical magnetohydrodynamics model. Soft x-ray optimization is done in four steps. In the first step, gas pressure is varied from 0.1 Torr until 10 Torr with small increments, and optimum gas pressure is found as 1.15 Torr with fixed anode and cathode radii (8 and 14.5 cm). Soft x-ray yield with optimum gas pressure alone is found to be 3046 J (2.26% of 135 kJ bank energy). Then anode and cathode radii are optimized separately and they are found as 8.458 and 11.1 cm, respectively. Soft x-ray yield with separately found optimum pressure, anode radius, and cathode radius (1.15 Torr, 8.458 cm, and 11.1 cm) is increased to 3543 J (2.63% of 135 kJ bank energy). In the second step, anode and cathode radii are optimized with respect to two fixed cathode-to-anode ratios (14.5/8 = 1.8125 and 11.1/8.458 = 1.3124) for various pressures ranging from 0.5 Torr until 4 Torr with 0.25 Torr increments. Soft x-ray yield of 4500 J (3.33% of 135 kJ bank energy) is calculated in this step at 0.5 Torr with cathode-to-anode ratio of 1.3124. In the third step, optimization of external inductance (ranging from 10 to 100 nH) is done for optimum soft x-ray yield. Soft x-ray yield in SPF reaches 4684 J (3.47% of 135 kJ bank energy) after optimizing external inductance (54 nH). In the last step, the effect of charging voltage on soft x-ray yield is investigated. Charging voltage is varied from 20 kV until 35 kV with 1 kV increments. After optimizing charging voltage (31 kV) in addition to the other optimum parameters, soft x-ray yield reaches 6348 J (3.07% of 207 kJ bank energy). Even though soft x-ray yield is increased with increasing charging voltage, soft x-ray yield as % of bank energy is decreased. The device also achieves maximum current of 1852 kA (4 Torr, 30 kV). Overall, soft x-ray yield is increased from 3046 J (with optimum pressure alone) to 6348 J after optimizing gas pressure, anode radius, cathode radius, external inductance, and charging voltage in SPF.

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“…The soft X-ray emission from dense plasma focus is according to two mechanisms: linear radiation and continuum radiation (recombination and Bremsstrahlung radiation) [18][19][20]. The hard X-rays are also produced by the collisions of electron beams resulting from the collapse of the plasma pinch with the anode [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Atomic Number on Plasma Pinch Properties and Radiative Emissions

Sahyouni

¹

,

Nassif

²

2021

Advances in High Energy Physics

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The aim of the research is to examine the dependence of plasma pinch properties and radiation emissions on the atomic number of the operating gas within the dense plasma focus device (NX2) when using hydrogen and argon gases. Simulation was performed with Lee’s code on an NX2 dense plasma focus at a constant gas pressure value ( P 0 = 0.5 torr ). The results showed that the minimum radius of the plasma focus in the case of the hydrogen plasma pinch was 0.30 cm and in the case of the argon plasma pinch 0.17 cm, and this affected the value of the radiation emission as it was 7.8 × 10 − 6 J and 11 J for the hydrogen and argon pinch, respectively. The energy of the ion beam released by the breakdown of the plasma pinch was found as E n = 23.8 J in the state of hydrogen and E n = 105 J in the state of argon.

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Approach to the Highest HXR Yield in Plasma Focus Device Using Adaptive Neurofuzzy Inference System to Optimize Anode Configuration

Cited by 5 publications

References 32 publications

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Neon soft x-ray yield optimization in spherical plasma focus device

Effect of Atomic Number on Plasma Pinch Properties and Radiative Emissions

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