scholarly journals Optimization of neon soft X-ray yield in a low-energy dense plasma focus device

2019 ◽  
Vol 33 (07) ◽  
pp. 1950077 ◽  
Author(s):  
M. A. Malek ◽  
M. K. Islam ◽  
M. Akel ◽  
M. Salahuddin ◽  
S. H. Saw ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Dense Plasma ◽  
Optimum Combination ◽  
Theoretical Physics ◽  
Lee Model Code ◽  
X Ray ◽  
Model Code ◽  
Yield Formula ◽  
Optimum Formula

The modified version of Lee model code is used in numerical experiments for characterizing and optimizing neon soft X-ray yield ([Formula: see text]) of the United Nations University/International Center for Theoretical Physics Plasma Focus Facility (UNU/ICTP PFF) device operated at 14 kV and 30 [Formula: see text]. In our present work, the neon yield [Formula: see text] is improved with an optimized UNU/ICTP PFF device by computing the optimum combination of static inductance ([Formula: see text]), anode length ([Formula: see text]), anode radius ([Formula: see text]) and cathode radius ([Formula: see text]), keeping fixed their ratio ([Formula: see text]) at 3.368, through a lot of numerical experiments at six operating pressures ([Formula: see text]). At lower [Formula: see text] (e.g. 2.0, 2.5 and 3.3 Torr), the optimum [Formula: see text] value, together with the corresponding optimum combination of [Formula: see text], [Formula: see text] and [Formula: see text], is found to be 15 nH, whereas at higher [Formula: see text] (e.g. 4.0, 5.0 and 6.0 Torr), it is obtained as 10 nH. Though the computed maximum neon yield [Formula: see text] (57.2 J with the corresponding efficiency of 1.94%) is found at [Formula: see text], assuming an achievable range of incorporating low-inductance technology, the best optimum combination of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] is found to be at [Formula: see text], resulting in the computed optimum neon yield [Formula: see text] of 54.60 J with a corresponding efficiency of 1.9%. This computed neon yield [Formula: see text] is about 11 times higher than the measured value [Formula: see text] at optimum [Formula: see text] of UNU/ICTP PFF. It is also observed that our computed neon yield [Formula: see text] is improved by around six times from the previously computed value, which was 9.5 J at the optimum [Formula: see text] Torr for optimum anode configuration of this machine. In addition, neon yield [Formula: see text] is obtained with our optimized combination of [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] at 11.5 kV and compared with the measured neon yield [Formula: see text] of the NX2 machine.

scholarly journals Correlation of measured neon soft X-ray pulses of the INTI plasma focus with the reflected shock phase at 12KV

2014 ◽  
Vol 32 ◽  
pp. 1460327
Author(s):  
Federico A. Roy ◽  
Perk Lin Chong ◽  
Sor Heoh Saw
Keyword(s):  
Plasma Focus ◽  
Energy Window ◽  
Current Waveform ◽  
Lee Model Code ◽  
X Ray ◽  
Model Code ◽  
Reflected Shock ◽  
Shock Phase ◽  
Time Histories ◽  
Pinch Phase

The six-phase Lee Model Code is used to fit the computed current waveform to the measured waveform of the INTI Plasma Focus (PF;2.2 kJ at 12 kV), a T2 PF device, operated as a source of Neon soft X-ray (SXR) with optimum yield around 2.5 - 3 Torr of neon. The characteristic He-like and H-like neon line SXR pulse is measured using a pair of SXR detectors with selected filters that, by subtraction, have a photon energy window of 900 to 1550 eV covering the region of the characteristic neon SXR lines. The aim of this paper is to investigate the correlation between the time histories of the measured Neon soft X-ray pulse and the reflected shock phase of the computed current waveform which has been fitted to the measured current waveform. Results shows that the characteristic neon SXR measured at 3.17 J with a pulse duration of 249 ns starts typically after the radial inward shock phase and increases in magnitude few ns before the pinch phase. It tails unto the first anomalous resistance, and decays at the second anomalous resistance.

scholarly journals Comparison of Plasma Dynamics in Plasma Focus Devices PF1000 and PF400

2016 ◽  
Vol 3 (1) ◽  
pp. 55 ◽  
Author(s):  
Amir Shakya ◽  
Prakash Gautam ◽  
Raju Khanal
Keyword(s):  
Experimental Data ◽  
Plasma Focus ◽  
Numerical Experiments ◽  
Atomic Energy Commission ◽  
Total Current ◽  
Current Waveform ◽  
Lee Model Code ◽  
Plasma Dynamics ◽  
Model Code ◽  
Pinch Current

<p>In this work we have simulated two different sizes of plasma focus devices: PF400, a small sub-kJ plasma focus device in operation at the Atomic Energy Commission in Chile and PF1000, a 1 MJ device at the International Centre for Dense Magnetised Plasmas (ICDMP) in Warsaw, Poland. Our aim is to compare the plasma dynamics observed in two different sizes of the devices. We compare the experimentally obtained data with the data predicted from our numerical experiments using the Lee model code. It has been observed that the peak current of the total current waveform, pinch current calculated from total current, and neutron yield agree reasonably well with published experimental data, however, slight differences are found in other parameters.</p><p>Journal of Nepal Physical Society Vol.3(1) 2015: 55-59</p>

scholarly journals Application of Lee Model Curve on Fitting of Discharge Current Curve of Plasma Focus Device

2021 ◽  
Vol 1 (1) ◽  
pp. 47-56
Author(s):  
Prakash Gautam
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Electrical Circuit ◽  
Model Parameters ◽  
Lee Model Code ◽  
Lee Model ◽  
Model Code ◽  
Current Curve ◽  
Computer Based ◽  
Current Trace

A dense plasma focus is a table top machine producing a short-lived extremely popular plasma and cause fusion. Lee Model Code is a computer-based visual basic simulation package, which was successfully utilized in the plasma focus devices. The dynamics of plasma focus discharge is quite complicated, so to review and simplify the complication Lee Model couples electrical circuit with the plasma focus dynamics, radiation and therefore the thermodynamics. This enables us to simulate all of the gross focus properties. In this paper the numerical experiments are carried out to compute the current trace as a function of time for plasma focus (PF) device NX2. Results obtained by the numerical experiments are compared with the published laboratory measured data. This current fitting is completed to get the model parameters.

scholarly journals A 160 kJ dual plasma focus (DuPF) for fusion-relevant materials testing and nano-materials fabrication

2014 ◽  
Vol 32 ◽  
pp. 1460322 ◽  
Author(s):  
S. H. Saw ◽  
V. Damideh ◽  
P. L. Chong ◽  
P. Lee ◽  
R. S. Rawat ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Ion Beam ◽  
Reactor Wall ◽  
Materials Testing ◽  
Nano Materials ◽  
Large Area ◽  
Lee Model Code ◽  
3D Design ◽  
Model Code

This paper summarizes PF-160 Dual Plasma Focus (DuPF) numerical experiments using the Lee Model code and preliminary 3D design drawings using SolidWorks software. This DuPF consists of two interchangeable electrodes enabling it to be optimized for both Slow Pinch Mode (SFM) and Fast Pinch Mode (FFM); the latter using a speed factor (SF) of 90 kA cm-1 Torr-0.5 for FFM in deuterium [S Lee et al, IEEE Trans Plasma Science 24, 1101-1105 (1996)]; and the former with SF of less than half that value for SFM. Starting with available 6 × 450 µF capacitors rated at 11kV (10% reversal), numerical experiments indicate safe operation at 9 kV, 6 Torr deuterium with FFM anode of 5 cm radius; producing intense ion beam and streaming plasma pulses which would be useful for studies of potential fusion reactor wall materials. On the other hand operating at 5 kV, 10 Torr deuterium with SFM anode of 10 cm radius leads to long-duration, uniform large-area flow which could be more suitable for synthesis of nano-materials. The dual plasma focus design is illustrated here with two figures showing FFM and SFM electrodes.

scholarly journals Introduction to Numerical Experiment on Plasma Focus using Lee Model Code

2015 ◽  
Vol 5 ◽  
pp. 137-141
Author(s):  
P. Gautam ◽  
R. Khanal
Keyword(s):  
Computer Simulation ◽  
Plasma Focus ◽  
Dense Plasma ◽  
Electrical Circuit ◽  
Dense Plasma Focus ◽  
Lee Model Code ◽  
Lee Model ◽  
Model Code ◽  
Hot Plasma ◽  
Simulation Package

A dense plasma focus is table top machine producing short-lived very hot plasma and can cause nuclear fusion. Lee Model Code is a computer simulation package, which was successfully used in Mather and Fillipov type plasma focus. Lee Model couples the electrical circuit with the plasma focus dynamics, radiation and thermodynamics to simplify the complicated dynamics of plasma focus. This package enables us to simulate and analyze all of the gross properties. In this paper we present the importance of current fitting and the relation of it with other plasma focus parameter and overview of Lee Model Code together with physical basis, scope and the results obtained from the Lee Model Code. The Himalayan Physics Year 5, Vol. 5, Kartik 2071 (Nov 2014)Page: 137-141

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