Preliminary Results of Kansas State University Dense Plasma Focus

Abdou, A.; Ismail, M.; Mohamed, A. E.; Lee, S.; Saw, S. H.; Verma, Rishi

doi:10.1109/tps.2012.2209682

Cited by 19 publications

(15 citation statements)

References 9 publications

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“…X-ray emission is highly gas dependent and has been found to scale as ∼ − E I xray peak 3.2 5.5 [3,36]. Considerable numerical analysis for neutron and x-ray scaling has been conducted by Lee and is evident in the success of his 5 phase model, which shows good agreement with experiments involving low inductance Mather type focus devices with E >1 kJ [37,38]. A motivation for building lower energy devices-those with small anode radii-is so that rapidly firing radiation sources may be investigated.…”

Section: Introductionmentioning

confidence: 73%

Dynamics of two microscale DPF devices

Pollard

Duggleby²,

Staack

2015

J. Phys. D: Appl. Phys.

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Dense plasma focus (DPF) devices are coaxial transient discharge devices capable of generating plasma densities greater than 10 16 cm −3 with ion temperatures in excess of 1 keV by compression resulting from strong magnetic fields created by high pulsed current. They are predominately used for high energy particle generation, but they are also convenient for investigating pinch dynamics due to their relatively fast repetition rates. These devices have been extensively studied at length scales on the order of cm, and this work helps to bridge understanding of larger low pressure pinches and more recent moderate energy density sources with novel applications like portable sources for high energy particles. In this research, the dynamics of two significantly smaller DPF devices operating in 50-190 torr He at <5 J/pulse with anode radii of 550 μm and 100 μm have been investigated using a 50 ns gated ICCD to image discharges throughout their lifetimes. Typical discharge stages of breakdown, rundown, pinch and expansion are observed for the microscale DPF. Images during the breakdown process are compared with respect to their symmetry, the velocity of their features, and their relative pinch intensities. Applicable scaling parameters are also compared to those of other DPF devices. In addition, the applicability of Knudsen scaling to DPF operation is introduced. The images show that as the anode radius decreases, breakdown and rundown features tend towards symmetry at higher pressure and near the Paschen minimum.

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Section: Introductionmentioning

confidence: 73%

Dynamics of two microscale DPF devices

Pollard

Duggleby²,

Staack

2015

J. Phys. D: Appl. Phys.

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“…2010, El-Aragi 2010, Abdou et al. 2012, Bures, Krishnan & James 2012, Caballero Bendixsen et al. 2016).…”

Section: A Candidate Tsr Systemmentioning

confidence: 99%

Toward laboratory torsional spine magnetic reconnection

Chesny¹,

Orange²,

Oluseyi

et al. 2017

J. Plasma Phys.

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Magnetic reconnection is a fundamental energy conversion mechanism in nature. Major attempts to study this process in controlled settings on Earth have largely been limited to reproducing approximately two-dimensional (2-D) reconnection dynamics. Other experiments describing reconnection near three-dimensional null points are non-driven, and do not induce any of the 3-D modes of spine fan, torsional fan or torsional spine reconnection. In order to study these important 3-D modes observed in astrophysical plasmas (e.g. the solar atmosphere), laboratory set-ups must be designed to induce driven reconnection about an isolated magnetic null point. As such, we consider the limited range of fundamental resistive magnetohydrodynamic (MHD) and kinetic parameters of dynamic laboratory plasmas that are necessary to induce the torsional spine reconnection (TSR) mode characterized by a driven rotational slippage of field lines – a feature that has yet to be achieved in operational laboratory magnetic reconnection experiments. Leveraging existing reconnection models, we show that within a ${\lesssim}1~\text{m}^{3}$ apparatus, TSR can be achieved in dense plasma regimes (${\sim}10^{24}~\text{m}^{-3}$) in magnetic fields of ${\sim}10^{-1}~\text{T}$. We find that MHD and kinetic parameters predict reconnection in thin ${\lesssim}20~\unicode[STIX]{x03BC}\text{m}$ current sheets on time scales of ${\lesssim}10~\text{ns}$. While these plasma regimes may not explicitly replicate the plasma parameters of observed astrophysical phenomena, studying the dynamics of the TSR mode within achievable set-ups signifies an important step in understanding the fundamentals of driven 3-D magnetic reconnection and the self-organization of current sheets. Explicit control of this reconnection mode may have implications for understanding particle acceleration in astrophysical environments, and may even have practical applications to fields such as spacecraft propulsion.

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“…This code was used as a complement to the study of UNU / ICTP PFF [6], NX1 [7], NX2 [8] and DENA [9], a modified model of the Filippov model. The program has also been used to improve many lowenergy devices such as FNII [10], UBA [11] and KSU PF [12].…”

Section: Lee's Codementioning

confidence: 99%

Ions Beam Properties Produced by NX2 Plasma Focus Device with Helium and Nitrogen Gas

Sahyouni¹

2019

AJMP

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Numerical experiments carried out using the Lee code to study some properties of ions beam (flux, fluence and ion beam energy) produced by the NX2 dense plasma device when using light gas (helium) and heavy gas (nitrogen) when gas pressure changes. The results showed that in the case of light gas (helium), the flux and fluence of the beam were higher while the ion beam energy was higher in the case of heavy gas (nitrogen) because the effective charge of nitrogen's ion is greater and also the voltage generated by the collapse of pinch was higher.

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Preliminary Results of Kansas State University Dense Plasma Focus

Cited by 19 publications

References 9 publications

Dynamics of two microscale DPF devices

Dynamics of two microscale DPF devices

Toward laboratory torsional spine magnetic reconnection

Ions Beam Properties Produced by NX2 Plasma Focus Device with Helium and Nitrogen Gas

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