A new multi-line cusp magnetic field plasma device (MPD) with variable magnetic field

Patel, A. D.; Sharma, M.; Ramasubramanian, N.; Ganesh, R.; Chattopadhyay, P. K.

doi:10.1063/1.5007142

Cited by 10 publications

(12 citation statements)

References 36 publications

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“…Figure 8 is genetrated from the code and its show the procedure of analysis of electron temperature. A detailed analysis of electron temperature (T e ) has been reported in an earlier publication by the same authors [23].The trace-1 is V-I characteristic at the mid plane ((r, θ) plane, which is z = 65 cm apart from the filament) of the device and R= 0 cm. Similarly the trace-2 is V-I characteristic at R=14cm along the non-cusp region and same plane.…”

Section: Resultsmentioning

confidence: 89%

“…The primary electrons emitted from the filaments travel in the electrical field directions towards chamber wall anode, while they are confined by the cusp magnetic field lines. All experimental measurements as well as the radial profile of plasma parameters are measured along the non-cusp region (the region in between two consecutive magnets) are carried out at mid (r, θ) plane of the device which is z=65 cm away from the filaments at 2×10 −4 mbar until and unless specified [22].…”

Section: Methodsmentioning

confidence: 99%

“…A detailed analysis of electron temperature (T e ) has been reported in our earlier publication [23].…”

Section: A Analysis Of Electron Temperature (T E ) and Plasma Densitymentioning

confidence: 99%

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Characterization of argon plasma in a variable multi-pole line cusp magnetic field configuration

Patel¹,

Sharma²,

Ramasubramanian³

et al. 2020

Phys. Scr.

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This paper demonstrates a detailed characterization of argon plasma in a variable multi-pole line cusp magnetic field (VMMF). The VMMF has been produced by placing six electromagnets (with embedded profiled vacoflux-50 core) over a large cylindrical volume (1 m axial length and 40 cm diameter). The magnetic field have been measured by hall probe method and compared with simulated magnetic field by performing simulation using FEMM tools. Results from magnetic field simulation indicate that the rate of change of pole magnetic field (maximum magnetic field) with respect to magnet current for vacoflux-50 core is high (7.53 G/A) as compared to the simple air core electromagnet (2.15 G/A). The area of the nearly field free region (null region) in the chamber volume can be controlled without changing a number of pole magnets. From the experimental results, it has been observed that in this field configuration the confinement of the primary electrons increases and leak width of plasma decreases with increasing the magnetic field. Thus the mean density, particle confinement time and the stability of the plasma increase with increasing magnetic field. In addition to this, it has been found that the radial uniformity of the plasma density explicitly depends on the VMMF. It is also shown that the VMMF controls the scavenging of confined primary electrons and confinement of primary electron increased with magnetic field which helps to boost up the plasma density.

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Section: Resultsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

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Characterization of argon plasma in a variable multi-pole line cusp magnetic field configuration

Patel¹,

Sharma²,

Ramasubramanian³

et al. 2020

Phys. Scr.

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show abstract

“…The ion-acoustic wave propagation study is performed in a cylindrical Multi-pole line cusp Plasma Device (MPD) [38]. This device has facility to operate with or without magnetic field and for present experiments the MPD is used as an unmagnetized linear plasma device.…”

Section: IImentioning

confidence: 99%

Evidence for neutrals carrying ion-acoustic wave momentum in a partially ionized plasma

et al. 2020

Self Cite

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An experimental study of Ion Acoustic (IA) wave propagation is performed to investigate the effect of neutral density for argon plasma in an unmagnetized linear plasma device. The neutral density is varied by changing the neutral pressure, which in turn allows the change in ion-neutral, and electron-neutral collision mean free path. The collisions of plasma species with neutrals are found to modify the IA wave characteristics such as the wave amplitude, velocity, and propagation length. Unlike the earlier reported work where neutrals tend to heavily damp IA wave in the frequency regime (where is ion-acoustic mode frequency and is ion-neutral collision frequency), the experimental study of IA wave presented in this paper suggests that the collisions support the wave to propagate for longer distances as the neutral pressure increases. A simple analytical model is shown to qualitatively support the experimental findings.

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“…Examples include the multipurpose device called the Big Red Ball, 22,23 high efficiency multistage plasma thrusters for space propulsion, 24 ion sources for charged particle beams, 25 plasma chambers for processing materials, 26,27 and other plasma confinement and control systems for studies of plasma phenomena. [28][29][30][31] Such devices may benefit from enhanced plasma confinement, which may be possible by incorporating plasmaimmersed magnetic coils.…”

Section: Introductionmentioning

confidence: 99%

Magnetic confinement of effectively unmagnetized plasma particles

Ordonez

2020

Physics of Plasmas

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A purely magnetic applied field may provide plasma confinement under conditions where the bulk of the plasma is effectively free of the applied magnetic field. The applied magnetic field surrounds the bulk of the plasma, and plasma particles that are incident on the applied magnetic field can be reflected back into the effectively unmagnetized region of plasma. The concept belongs to a class of magnetic plasma confinement approaches studied long ago, for which some experimental results indicated that classical (collision-based) cross-magnetic-field transport may occur. However, multiple magnetic coils are required to be immersed within the confined plasma, and rapid plasma loss may occur if material structures are present, which pass through the plasma (e.g., to hold the immersed coils in place). In the work reported, the concept is studied in combination with magnetic plasma expulsion [R. E. Phillips and C. A. Ordonez, Phys. Plasmas 25, 012508 ( 2018)], which would be employed to keep plasma away from material structures that pass through the plasma. A planar model is used for the study. A classical trajectory Monte Carlo simulation is carried out on particles that are independently incident on the applied magnetic field. With monoenergetic incident particles, the results indicate that the applied magnetic field can reflect all independently incident particles in certain regions of parameter space. Prospects for achieving three-dimensional magnetic confinement of an effectively unmagnetized plasma with a Maxwellian velocity distribution are discussed.

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A new multi-line cusp magnetic field plasma device (MPD) with variable magnetic field

Cited by 10 publications

References 36 publications

Characterization of argon plasma in a variable multi-pole line cusp magnetic field configuration

Characterization of argon plasma in a variable multi-pole line cusp magnetic field configuration

Evidence for neutrals carrying ion-acoustic wave momentum in a partially ionized plasma

Magnetic confinement of effectively unmagnetized plasma particles

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