Numerical Experiments on Oxygen Plasma Focus: Scaling Laws of Soft X-Ray Yields

2013 ◽  
Vol 32 (4) ◽  
pp. 464-470 ◽  
Author(s):  
M. Akel
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Oxygen Plasma ◽  
Scaling Laws ◽  
X Ray

Numerical experiments on the PF1000 plasma focus device operated with nitrogen and oxygen gases

2017 ◽  
Vol 31 (16) ◽  
pp. 1750167 ◽  
Author(s):  
M. Akel ◽  
Sh. Ismael ◽  
S. Lee ◽  
S. H. Saw ◽  
H. J. Kunze
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Oxygen Plasma ◽  
Stored Energy ◽  
X Ray ◽  
Water Window ◽  
Energy Formula ◽  
Window Region ◽  
Cooling Effects ◽  
Radiative Collapse

The indicative values of reduced Pease–Braginskii (P–B) currents are estimated for a nitrogen and oxygen plasma focus. The values of depletion times indicate that in N2 and O2 with estimated 3–4% of pinch energy radiating away over the duration of the pinch, we may expect some cooling effects leading to small reductions in radius ratio. In other gases with higher atomic number, the pinch duration is much more than the depletion time, so radiative contraction may be anticipated. The Lee model was employed to study the soft X-ray from PF1000 operated with nitrogen and oxygen. We found nitrogen soft X-ray yield in the water window region of 3.13 kJ, with the corresponding efficiency of 0.9% of the stored energy [Formula: see text], while for the oxygen it was found to be [Formula: see text] = 4.9 kJ, with the efficiency of 1.4% [Formula: see text]. The very modest enhancement of compression (radius ratios around 0.1) in the pinches of these two gases gives rise to rather modest pinch energy densities (PEDs) under 109 Jm[Formula: see text]. This is in contrast to Kr or Xe where it had been shown that the radiative collapse leads to radius ratios of 0.007 and 0.003, respectively, with PEDs going to large values considerably exceeding 10[Formula: see text] Jm[Formula: see text].

Numerical Experiments to Optimize Argon Soft X-Ray Yield in a Low-Energy Plasma Focus

2019 ◽  
Vol 47 (6) ◽  
pp. 2790-2800
Author(s):  
Kamal M. Ahmed ◽  
Tarek M. Allam ◽  
Hanaa A. El-Sayed ◽  
Fathy B. Diab ◽  
Hanaa M. Soliman
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
Low Energy ◽  
X Ray

Numerical experiments on plasma focus neon soft x-ray scaling

2009 ◽  
Vol 51 (10) ◽  
pp. 105013 ◽  
Author(s):  
S Lee ◽  
S H Saw ◽  
P Lee ◽  
R S Rawat
Keyword(s):  
Plasma Focus ◽  
Numerical Experiments ◽  
X Ray

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.

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