Study of plasma sheath dynamics by using two magnetic probes in a low energy plasma focus device

Behbahani, R. A.; Mahabadi, T. D.; Ghoranneviss, M.; Aghamir, M F; Namini, Sanaz E.; Ghorbani, Amir; Najafi, Mohammad

doi:10.1088/0741-3335/52/9/095004

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…So, the results show that the CS needs 20 μs to travel a distance 26 cm approximately from the cathode breach end at the bottom as reported in Ref. 39. Also, the diagram shows that a reversed magnetic field is generated in curves of the case of 24 and 26 cm.…”

Section: ( ) /supporting

confidence: 70%

Experimental investigation of a low-energy linear plasma propulsion device

Ahmed¹,

Diab²,

Gaber³

et al. 2020

Jpn. J. Appl. Phys.

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This paper presents preliminary results for a new design of a pulsed linear plasma device that generates electromagnetic plasma propulsion. The current sheath dynamics and the plasma propulsion along an extension tube have been studied. Breakdown of helium gas occurs between coaxial electrodes when applying a high-voltage pulse. This paper presents measurements with a number of probes, as well as camera images of the plasma propagation. A plasma is ejected and fills a 40 cm length extension tube. Additionally, the measurements show that the length of the propelled plasma column and its intensity inside the expansion tube is increased by increasing the charging voltage, while the plasma propulsion current is decreased along the extension tube. It is noted that a lower critical time; 4.7 μs, is needed to ionize the gas and form the plasma current sheath.

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Section: ( ) /supporting

confidence: 70%

Experimental investigation of a low-energy linear plasma propulsion device

Ahmed¹,

Diab²,

Gaber³

et al. 2020

Jpn. J. Appl. Phys.

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“…The schematic arrangement of a low-energy Mather-type PF device, which is used to synthesize thin films of Cr on Si(400) substrates, is shown in figure 1. This 1.6 kJ PF device is powered by a 10 µF, 18 kV single capacitor [26]. The static inductance of the device is about 130 nH and the peak discharge current is about 130 kA.…”

Section: Methodsmentioning

confidence: 99%

Investigation of structural properties of chromium thin films prepared by a plasma focus device

et al. 2012

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We report the synthesis of chromium thin films on Si(400) substrates by utilizing a low-energy (1.6 kJ) plasma focus device. The films of chromium are deposited with different numbers of focus shots (15, 25 and 35) at a distance of 8 cm and at 0° angular position with respect to the anode axis. The films are investigated structurally by x-ray diffraction analysis and morphologically by atomic force microscopy and scanning electron microscopy. The elemental composition is characterized by energy dispersive x-ray analysis. Furthermore, Vicker's micro hardness is used to study the mechanical properties of the deposited films. The degree of crystallinity of chromium films, the size of the particles and the hardness values of the films increase when the number of focus shots is raised from 15 to 25 and then decrease when the substrate is treated with 35 shots. We discuss the dynamic processes involved in the formation of the chromium films.

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“…The focused plasma column has a lifetime of typically 10 ns (for a kJ device) and then it becomes unstable and finally breaks away with emission of xrays, electrons and ions. Behbahani et al (2010) studied the dynamics of the current sheath in a low energy (4.9 kJ) PF device at various conditions of gas pressure, charging voltage and anode shape. Aghamir and Behbahani (2009), the dynamics of the current sheath during the initial break down phase in a Mather type PF device is investigated.…”

Section: Introductionmentioning

confidence: 99%

Study of Magnetic Field Behavior at Lower Pressure of Neon in the Axial Phase of INTI Plasma Focus

Devi¹,

Saw²,

Lee³

2014

RJASET

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The magnetic field distribution substantially affects mechanisms for the generation of radiation in Zpinches. Investigation of the axial component of the magnetic field is one of the important problems in plasma focus studies. The designed magnetic probe is intended to use for the study of current sheet in INTI plasma focus device with energy of about 3.3 kJ. The measurements of the azimuthal component of the magnetic field on the INTI Plasma Focus operated at neon pressures below 1 Torr was carried out using a custom built calibrated magnetic probe. The probe was tested for neon gas under the various lower pressures (i.e., 0.1, 0.3, 0.5 and 0.7, 1, 2, 3, 5 torr etc.). It is observed that the time response of the designed probe is sufficient for the rise time of the magnetic field associated with the current in the axial phase. We also note that the small size of the designed probe is well suited to sense the magnetic field without perturbing the plasma unduly. The probe designed and constructed is also suitable to carryout measurements to obtain axial distributions of trajectory, average axial velocity and magnetic field of the current sheath at a certain radial distances along the axis of the tube.

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Study of plasma sheath dynamics by using two magnetic probes in a low energy plasma focus device

Cited by 6 publications

References 10 publications

Experimental investigation of a low-energy linear plasma propulsion device

Experimental investigation of a low-energy linear plasma propulsion device

Investigation of structural properties of chromium thin films prepared by a plasma focus device

Study of Magnetic Field Behavior at Lower Pressure of Neon in the Axial Phase of INTI Plasma Focus

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