Parametric Optimisation of Plasma Focus Devices for Neutron Production

Lim, L. K.; Yap, S. L.; Lim, Lee-Ling; Neoh, Yuen Sim; Khan, Muhammad Zubair; Ngoi, S. K.; Yap, Seong Shan; Lee, S.

doi:10.1007/s10894-015-0014-5

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…To appreciate the value of the ability of the code to study ion beam characteristics and neutron yield in plasma focus devices, it is useful to note that a summary has been made of what has been achieved in similar simulation work (Lim et al, 2016), and another particularly on the use of computations to add to the database of plasma focus in respect to thermonuclear and beam-target fusion (Saw et al, 2015). Those summaries reviewed the work starting from Potter's (Potter, 1971) ground-breaking magnetohydrodynamics (MHD) studies demonstrating qualitative agreement with experimentally measured deuterium-deuterium (D-D) neutron yield although his thermonuclear mechanism was at odds with the "neutron yield anisotropy measured in plasma focus discharges".…”

Section: Introductionmentioning

confidence: 99%

Understanding Plasma Dynamics of Argentina Nano Focus Machine Using the Lee Code

Singh¹,

Lee²,

Oun³

et al. 2022

ASMScJ

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Argentina Nano Focus Machine is a small plasma focus machine used as an intense neutron source. To understand the working of its plasma dynamics, the Lee model code is used. The results obtained from the Lee code agree reasonably well with the experimental data in terms of the peak current, radial start time and the pinch duration. Additionally, this code also produces information such as the optimum neutron yield (6.2x104), maximum ion beam energy (1.2 J) and the dependence of these yields and various speeds on operating pressure. The resultant data is reliable and all the input that is required is just one experimental current waveform together with the actual machine and operating parameters.

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Section: Introductionmentioning

confidence: 99%

Understanding Plasma Dynamics of Argentina Nano Focus Machine Using the Lee Code

Singh¹,

Lee²,

Oun³

et al. 2022

ASMScJ

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“…The short-lived pinched plasma is inevitable due to plasma instabilities; including Rayleigh-Taylor, Sausage and Kink instabilities [10][11][12]. The transient phenomenon leading to the disruption of the pinch have been correlated to the plasma emission such as soft and hard x-ray, energetic ions, electrons and neutrons [13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of ion beam emission in a low pressure plasma focus device

Lim¹,

Yap²,

Nee³

et al. 2021

Plasma Phys. Control. Fusion

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The plasma that accelerates and compresses in the formation of the pinch in dense plasma focus devices has been found to be an abundant source of multiple radiations like ion beams and x-rays. In this work, the ion beam and x-ray emissions from a 2.7 kJ (13.5 kV, 30 µF) plasma focus device operated at pressure below 1 mbar were investigated. The time profile of the ion beam emission was analysed from the simultaneously measured ion beam, soft and hard x-ray signals using biased ion collectors, BPX 65 silicon PIN diode and a scintillator-photomultiplier tube assembly. Time resolved analysis of the emissions revealed that the emission of the ion beam corresponded to several different pinching instances. Two components of the ion beam were identified. An ion beam of lower energy but higher intensity was emitted followed by an ion beam of higher energy but lower intensity in the first plasma pinch. The ion beam emitted from the first plasma pinch also has higher energy than subsequent plasma pinches. The emission was found to be associated with the amplitude of voltage spike. The results from ion beam and electron beams suggest that they were emitted by the same localized electric field induced in the pinched plasma. The strongest plasma focus discharge indicated by sharp voltage spike of high amplitude and highest ion beam energy were both observed at 0.2 mbar. The average energy of the ion beam obtained is (53 ± 13) keV. At this optimum condition, the ions beam with the highest energy also led to the highest hard x-ray emission.

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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%

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

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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Parametric Optimisation of Plasma Focus Devices for Neutron Production

Cited by 10 publications

References 38 publications

Understanding Plasma Dynamics of Argentina Nano Focus Machine Using the Lee Code

Understanding Plasma Dynamics of Argentina Nano Focus Machine Using the Lee Code

Dynamics of ion beam emission in a low pressure plasma focus device

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

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