Comparison of Measured Soft X-Ray Yield Versus Pressure for NX1 and NX2 Plasma Focus Devices Against Computed Values Using Lee Model Code

2015 ◽  
Vol 34 (3) ◽  
pp. 686-693 ◽  
Author(s):  
P. Gautam ◽  
R. Khanal ◽  
S. H. Saw ◽  
S. Lee
Keyword(s):  
Plasma Focus ◽  
Lee Model Code ◽  
Lee Model ◽  
X Ray ◽  
Model Code

Characteristics of Fast ion beam in Neon and Argon filled plasma focus correlated with Lee Model Code

Vacuum ◽  
2019 ◽  
Vol 169 ◽  
pp. 108916
Author(s):  
V. Damideh ◽  
O.H. Chin ◽  
S.H. Saw ◽  
P.C.K. Lee ◽  
R.S. Rawat ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Ion Beam ◽  
Lee Model Code ◽  
Lee Model ◽  
Model Code ◽  
Fast Ion

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.

Comparison of Measured Neutron Yield Versus Pressure Curves for FMPF-3, NX2 and NX3 Plasma Focus Machines Against Computed Results Using the Lee Model Code

2014 ◽  
Vol 34 (3) ◽  
pp. 474-479 ◽  
Author(s):  
S. H. Saw ◽  
P. Lee ◽  
R. S. Rawat ◽  
R. Verma ◽  
D. Subedi ◽  
...  
Keyword(s):  
Plasma Focus ◽  
Neutron Yield ◽  
Lee Model Code ◽  
Lee Model ◽  
Model Code

scholarly journals Comparison of measured pinch parameters versus pressure for SABALAN1 plasma focus facility against computed values using Lee model code

AIP Advances ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 075209 ◽  
Author(s):  
F. S. Karimi ◽  
S. Saviz ◽  
M. Ghoranneviss ◽  
M. K. Salem ◽  
F. M. Aghamir
Keyword(s):  
Plasma Focus ◽  
Lee Model Code ◽  
Lee Model ◽  
Model Code

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 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 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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