Magnetic Probe Measurements in INTI Plasma Focus to Determine Dependence of Axial Speed with Pressure in Neon

Saw, S. H.; Akel, M.; Lee, P. C. K.; Ong, S. T.; Mohamad, Saiful Najmee; Ismail, Fadillah; Nawi, Nina Diana; Devi, K. K. A.; Sabri, R. M.; Baijan, A. H.; Ali, Jalil; Lee, S.

doi:10.1007/s10894-011-9487-z

Cited by 24 publications

(11 citation statements)

References 13 publications

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“…The filter pair, for Ch1 and Ch2, is designed to give a difference window in the spectral region of the characteristic He-like and H-like SXR emission from neon 900-1550 eV. 16 Subtracting the signal of Ch2 from that of Ch1 thus allows the amount of characteristic neon SXR falling on the detectors to be computed. For example, if, for a shot, the difference signal between the two channel is zero, this means that no emission in the 900-1550 eV is detected.…”

Section: Experimental Set Up and Methodologymentioning

confidence: 99%

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

Roy

Chong

Saw

2014

Int. J. Mod. Phys. Conf. Ser.

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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.

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Section: Experimental Set Up and Methodologymentioning

confidence: 99%

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

Roy

Chong

Saw

2014

Int. J. Mod. Phys. Conf. Ser.

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“…In general, the Lee code [15] simulates the development process of the current sheath in three main phases: the breakdown, the axial and the radial phase [6]. According to Lee [7], when the computed current profile is reasonably fitted to the measured current profile, then all gross physical properties in the plasma focus can be simulated in a realistic manner.…”

Section: Current Fitting Technique Using the Lee Model Codementioning

confidence: 99%

“…Gates [13] suggested the scaling rule of x-rays yield to be Y x ∼ I 4 peak /(r p ) 2 , where r p is the pinch radius. The I peak may be calculated for a given capacitor bank, but the quantification of the pinch radius is difficult as the radius keeps changing during the pinching [6]. Akel and Lee [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical experiments on neutron yield and soft x-ray study of a ∼100 kJ plasma focus using the current profile fitting technique

Ong

Chaudhary

Ali

et al. 2014

Plasma Phys. Control. Fusion

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Numerical experiments using the Lee model were performed to study the neutron yield and soft x-ray emission from the IR-MPF-100 plasma focus using the current fitting technique. The mass sweeping factor and the current factor for the axial and radial phase were used to represent the imperfections encountered in experiments. All gross properties including the yields were realistically simulated once the computed and measured current profiles were well fitted. The computed neutron yield Y n was in agreement with the experimentally measured Y n at 20 kV (E 0 ∼ 30 kJ) charging voltage. The optimum computed neutron yield of Y n = 1.238 × 10 9 neutrons per shot was obtained at optimum physics parameters of the plasma focus operated with deuterium gas. It was also observed that no soft x-rays were emitted from the IR-MPF-100 plasma focus operated with argon gas due to the absence of helium-like and hydrogen-like ions at a low plasma temperature (∼0.094 keV) and axial speed (8.12 cm µs −1). However, the soft x-ray yield can be achieved by increasing the charging voltage, using a higher ratio of outer anode radius to inner anode radius c or shorter anode length z 0 , or using neon as the operating gas.

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“…26 It has also been used in other machines for design and interpretation including sub-kJ PF machines, 27 FNII, 28 and the UBA hard x-ray source. 29 Information computed includes axial and radial dynamics, 17,18,21,23,30 SXR emission characteristics and yield, 11-15,22,23,25,31 design of machines, 16,17,[21][22][23] optimization of machines, 2,11,17,24 and adaptation to Filippov-type DENA. 26 Speed-enhanced PF 21 was facilitated.…”

Section: The Lee Model Codementioning

confidence: 99%

Plasma focus ion beam fluence and flux—For various gases

Lee

Saw

2013

Physics of Plasmas

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A recent paper derived benchmarks for deuteron beam fluence and flux in a plasma focus (PF) [S. Lee and S. H. Saw, Phys. Plasmas 19, 112703 (2012)]. In the present work we start from first principles, derive the flux equation of the ion beam of any gas; link to the Lee Model code and hence compute the ion beam properties of the PF. The results show that, for a given PF, the fluence, flux, ion number and ion current decrease from the lightest to the heaviest gas except for trend-breaking higher values for Ar fluence and flux. The energy fluence, energy flux, power flow, and damage factors are relatively constant from H2 to N2 but increase for Ne, Ar, Kr and Xe due to radiative cooling and collapse effects. This paper provides much needed benchmark reference values and scaling trends for ion beams of a PF operated in any gas.

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Magnetic Probe Measurements in INTI Plasma Focus to Determine Dependence of Axial Speed with Pressure in Neon

Cited by 24 publications

References 13 publications

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

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

Numerical experiments on neutron yield and soft x-ray study of a ∼100 kJ plasma focus using the current profile fitting technique

Plasma focus ion beam fluence and flux—For various gases

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