Plasma dynamics in pulsed strong magnetic fields

Doron, R.; Arad, R.; Tsigutkin, K.; Osin, D.; Weingarten, A.; Starobinets, A.; Bernshtam, V.; Stambulchik, E.; Ralchenko, Yuri; Maron, Y.; Fruchtman, A.; Fisher, A.; Huba, J. D.; Roth, Markus

doi:10.1063/1.1651491

Cited by 20 publications

(17 citation statements)

References 40 publications

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“…Previous investigations of the POS operation, in which a novel method was implemented for producing plasmas of controllable purity, have been reported on. 47,48 Currently, better control of the plasma composition is pursued 49,50 in the present configuration in order to study the dependence of the phenomena observed here on this parameter. Also, improved doping capabilities should allow for further studying the mechanisms responsible for the ion velocities in the normal directions.…”

Section: Discussionmentioning

confidence: 96%

Investigation of the ion dynamics in a multispecies plasma under pulsed magnetic fields

et al. 2004

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The interaction between a moving magnetic-field front and a low-collisionality plasma consisting of different ion species is investigated using spatially and temporally resolved spectroscopic techniques. The experiment is carried out in a plasma-opening-switch configuration, in which a current rising to 150 kA in 400 ns is conducted through a plasma that prefills the region between two planar electrodes. Ion-species separation is found to occur, similarly to the results reported for a 80 ns duration plasma-opening-switch experiment of cylindrical geometry, which was not necessarily expected since in the present experiment plasma pushing is more substantial. The separation, in which the light-ion plasma (protons) is reflected while the heavy-ion plasma (carbon) is penetrated by the propagating magnetic-field, is investigated by determining the electron density from the temporal evolution of spectral lines, the nonprotonic ion velocities from line-emission Doppler shifts, and the proton velocity distribution from Doppler shifts of line emissions from hydrogen atoms produced by proton charge exchange. The ion dynamics is shown to be consistent with the acceleration expected from the one-dimensional Hall electric field, based on the previously published magnetic-field and electron density evolutions. Significant acceleration of the nonprotonic ions behind the magnetic-field front is observed. It is found that a significant fraction of the protons acquire a velocity that is more than twice the velocity of the magnetic piston. This phenomenon is shown to result from the time dependence of the accelerating electric field and the broad acceleration region. The lateral motion of the nonprotonic ions is also discussed.

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Section: Discussionmentioning

confidence: 96%

Investigation of the ion dynamics in a multispecies plasma under pulsed magnetic fields

et al. 2004

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“…6,7 Although these plasmas have been developed for different materials processing applications-etching, deposition, implantation-the fundamental motivation behind using magnetic fields is controlling the spatial and energy distributions of electrons, ions, and neutrals. [8][9][10][11][12][13][14][15][16][17][18][19][20][21] Electron kinetics are often described as being local or nonlocal. Local electron kinetics is typically observed in high pressure systems where the electron energy relaxation length k e is smaller than the characteristic skin depth of the electromagnetic field, d, or chamber size L. 22 In non-local kinetics, k e is sufficiently large that the electron energy distribution (EED) based on total energy (kinetic energy plus potential energy) is essentially uniform across the chamber.…”

Section: Introductionmentioning

confidence: 99%

Electron energy distributions in a magnetized inductively coupled plasma

et al. 2014

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International audienceOptimizing and controlling electron energy distributions (EEDs) is a continuing goal in plasma materials processing as EEDs determine the rate coefficients for electron impact processes. There are many strategies to customize EEDs in low pressure inductively coupled plasmas (ICPs), for example, pulsing and choice of frequency, to produce the desired plasma properties. Recent experiments have shown that EEDs in low pressure ICPs can be manipulated through the use of static magnetic fields of sufficient magnitudes to magnetize the electrons and confine them to the electromagnetic skin depth. The EED is then a function of the local magnetic field as opposed to having non-local properties in the absence of the magnetic field. In this paper, EEDs in a magnetized inductively coupled plasma (mICP) sustained in Ar are discussed with results from a two-dimensional plasma hydrodynamics model. Results are compared with experimental measurements. We found that the character of the EED transitions from non-local to local with application of the static magnetic field. The reduction in cross-field mobility increases local electron heating in the skin depth and decreases the transport of these hot electrons to larger radii. The tail of the EED is therefore enhanced in the skin depth and depressed at large radii. Plasmas densities are non-monotonic with increasing pressure with the external magnetic field due to transitions between local and non-local kinetics

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“…In addition, the current-channel width according to EMG theory is two orders of magnitude smaller than that observed in experiments [8]. In recent papers, it is also pointed out that magnetic-field evolution cannot be explained in the EMG framework [9], and after finite time, plasma pushing is dominant [10].…”

Section: Introductionmentioning

confidence: 93%

Plasma and Magnetic-Field Dynamics in Conduction Phase of Opening Switch

Loginov

2009

IEEE Trans. Plasma Sci.

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Self-consistent plasma and magnetic-field dynamics in the plasma-opening-switch conduction phase is considered within the framework of 1-D single-fluid magnetohydrodynamics. The profiles of plasma-flow parameters and magnetic field in the switch current channel, depending on plasma conductivity, are obtained. An analytical solution for the magnetic-field profile in the current channel is presented. The energy partition in the current channel is calculated. The issue of plasma conductivity during the magnetic-field pulse is discussed.Index Terms-Current channel, energy partitioning, magneticfield distribution, plasma opening switch, shock wave.

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Plasma dynamics in pulsed strong magnetic fields

Cited by 20 publications

References 40 publications

Investigation of the ion dynamics in a multispecies plasma under pulsed magnetic fields

Investigation of the ion dynamics in a multispecies plasma under pulsed magnetic fields

Electron energy distributions in a magnetized inductively coupled plasma

Plasma and Magnetic-Field Dynamics in Conduction Phase of Opening Switch

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