Numerical Experiments on Oxygen Soft X-Ray Emissions from Low Energy Plasma Focus Using Lee Model
The X-ray emission properties of oxygen plasmas are numerically investigated using corona plasma equilibrium model. The Lee model is here modified to include oxygen in addition to other gases. It is then applied to characterize the Rico Plasma Focus (1 kJ), finding a oxygen soft X-ray yield (Ys...
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| 主要な著者: | , , , |
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| フォーマット: | 論文 |
| 言語: | English |
| 出版事項: |
Springer US
2010
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| 主題: | |
| オンライン･アクセス: | http://eprints.intimal.edu.my/198/1/5.pdf http://eprints.intimal.edu.my/198/ |
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| 要約: | The X-ray emission properties of oxygen
plasmas are numerically investigated using corona plasma
equilibrium model. The Lee model is here modified to
include oxygen in addition to other gases. It is then applied
to characterize the Rico Plasma Focus (1 kJ), finding a
oxygen soft X-ray yield (Ysxr) of 0.04 mJ in its typical
operation. Keeping the bank parameters and operational
voltage unchanged but systematically changing other
parameters, numerical experiments were performed finding
the optimum combination of pressure = 3 Torr, anode
length = 1.5 cm and anode radius = 1.29 cm. The optimum
Ysxr was 43 mJ. Thus we expect to increase the
oxygen Ysxr of PF-1 kJ thousand-fold from its present
typical operation; without changing the capacitor bank,
merely by changing the electrode configuration and operating
pressure. The modified version of the Lee model code
is also used to run numerical experiments with oxygen gas,
for optimizing the oxygen soft X-ray yield on the new
plasma focus device PF-SY2 (2.8 kJ). The static inductance
L0 of the capacitor bank is progressively reduced to
assess the effect on pinch current Ipinch. The experiments
confirm the Ipinch, limitation effect in plasma focus, where
there is an optimum L0 below which although the peak
total current, Ipeak, continues to increase progressively with
progressively reduced inductance L0, the Ipinch and consequently
the soft X-ray yield, Ysxr, of that plasma focus
would not increase, but instead decreases. The obtained
results indicate that reducing the present L0 of the PF-SY2
device will increase the oxygen soft X-ray yield till the
maximum value after that the Ysxr will decrease with Ipinch
decreasing. |
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