Deuteron Beam Source Based on Mather Type Plasma Focus

Lim, L. K.; Yap, S. L.; Wong, C. S.; Zakaullah, M.

doi:10.1007/s10894-012-9566-9

Cited by 11 publications

(8 citation statements)

References 29 publications

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“…As a result of the Lorentz force this is accelerated along the electrodes until at the open end formation occurs of a short-lived pinched-plasma column that is of high density, at > 10 25 particles/m 3 , and very high temperature ~ (1–3) × 10 7 o C [ 1 ]. The transient hot and dense plasma is of particular interest due to the multitude of physical phenomena, typically magnetohydrodynamic instabilities, producing an intense burst of energetic and multi-radiation emissions, including x-rays, ions and electrons [ 2 – 4 ]. Previous University of Malaya research on this plasma tended to concentrate on the plasma focus as a neutron source [ 5 ], also in studies of the neutron production mechanism [ 6 – 10 ], related in particular to the investigation of the thermonuclear origin.…”

Section: Introductionmentioning

confidence: 99%

Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

2018

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The plasma focus device discussed herein is a Z-pinch pulsed-plasma arrangement. In this, the plasma is heated and compressed into a cylindrical column, producing a typical density of > 1025 particles/m3 and a temperature of (1–3) × 107 oC. The plasma focus has been widely investigated as a radiation source, including as ion-beams, electron-beams and as a source of x-ray and neutron production, providing considerable scope for use in a variety of technological situations. Thus said, the nature of the radiation emission depends on the dynamics of the plasma pinch. In this study of the characteristics of deuteron-beam emission, in terms of energy, fluence and angular distribution were analyzed. The 2.7 kJ plasma focus discharge has been made to operate at a pressure of less than 1 mbar rather than at its more conventional operating pressure of a few mbar. Faraday cup were used to determine deuteron-beam energy and deuteron-beam fluence per shot while CR-39 solid-state nuclear track detectors were employed in studying the angular distribution of deuteron emission. Beam energy and deuteron-beam fluence per shot have been found to be pressure dependent. The largest value of average deuteron energy measured for present conditions was found to be (52 ± 7) keV, while the deuteron-beam fluence per shot was of the order of 1015 ions/m2 when operated at a pressure of 0.2 mbar. The deuteron-beam emission is in the forward direction and is observed to be highly anisotropic.

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Section: Introductionmentioning

confidence: 99%

Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

2018

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“…Both the Faraday cup and biased ion collectors were placed inside a drift tube which is installed along the direction from the anode. The experimental setup of the plasma focus and its diagnostic has been reported elsewhere [3]. The pressure inside the drift tube is kept below 10 -4 mbar and separated from plasma focus chamber by a 2 mm diameter pinhole.…”

Section: Plasma Focus Device and Diagnosticsmentioning

confidence: 99%

“…The plasma produced is of very high temperature (1-3 keV) and high density (>10 19 Particles/cm 3 ) [1]. The device is particularly interesting due to its special characteristic as intense pulsed sources of X-rays, ions, electrons and neutrons (deuterium filling) [2][3][4][5]. The early research was concentrated on the neutron emission [6,7] and yet in recent years, there is abrupt growth of researcher's interest in utilized plasma focus for its application in surface modification [8], ion implantation [9] and thin film deposition [10].…”

Section: Introductionmentioning

confidence: 99%

Diagnostics of ion beam generated from a Mather type plasma focus device

Lim¹,

Ngoi²,

Wong³

et al. 2014

AIP Conference Proceedings

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Diagnostics of ion beam emission from a 3 kJ Mather-type plasma focus device have been performed for deuterium discharge at low pressure regime. Deuterium plasma focus was found to be optimum at pressure of 0.2 mbar. The energy spectrum and total number of ions per shot from the pulsed ion beam are determined by using biased ion collectors, Faraday cup, and solid state nuclear track detector CR-39. Average energy of the ion beam obtained is about 60 keV. Total number of the ions has been determined to be in the order of 10 11 per shot. Solid state nuclear track detectors (SSNTD) CR39 are employed to measure the particles at all angular direction from end on (0˚) to side on (90˚). Particle tracks are registered by SSNTD at 30˚ to 90˚, except the one at the end-on 0 ˚.

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“…Due to the simplicity in design and operation, plasma focus device has attained considerable interest mainly for its high neutron yield in the application of intense pulse neutron sources when operated in deuterium filling [2,3]. Moreover, it is also a rich plasma-based source of radiations, including ion, electron beams, soft and hard X-rays which are emitted from the resultant effect of extreme conditions upon plasma pinching [4][5][6]. The mechanism related to neutron production in the plasma focus is rather complex and still not fully understood.…”

Section: Introductionmentioning

confidence: 99%

“…Maximum axial speeds of 1.5 9 10 5 m/s (15 cm/ls) was achieved and the neutron emission was found to be dependent on sheath velocity. They proposed a neutron scaling law of Y th a (IV) 4 where Y th is the thermonuclear neutrons, I is the peak discharge current and V is the peak axial speed.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimisation of Plasma Focus Devices for Neutron Production

et al. 2015

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A large number of experimental investigations have been carried out on plasma focus devices especially at low energy level of several kJ or over 100 kJ. There are few machines operating in the middle energy range of 10-50 kJ, where the neutron yield typically in the order of 10 8 -10 9 per shot. This paper reviews the optimisation process of two different plasma focus devices (12 kJ) by applying the Lee model code. The neutron yield (Y n ) versus pressure (P) curve for several configurations of the two plasma focus provided insight of geometrical optimisation. Measured discharge current is fitted as the first step of modelling to correctly simulate the plasma dynamics. Subsequently the code is used to simulate the neutron yield of the two plasma focus devices based on beam target mechanism. Good agreement between the computed results of neutron yield versus pressure and the measured yield versus pressure is found up to the pressure where highest neutron yield is obtained. Computed highest neutron yield for most of the configuration typically differ by a factor\2.

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Deuteron Beam Source Based on Mather Type Plasma Focus

Cited by 11 publications

References 29 publications

Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

Diagnostics of ion beam generated from a Mather type plasma focus device

Parametric Optimisation of Plasma Focus Devices for Neutron Production

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