Collision frequency of charged particles in a weekly ionized gas in a strong magnetic field

Imazu, Shingo

doi:10.1103/physreva.23.2644

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…The gyroradius of the ions () is greater than the electron gyroradius (), consequently the curvature of the ion's trajectory is smaller than the electron's trajectory, which should not affect the ion–ion collisions either. On the contrary, the presence of the magnetic field will reduce the ion–neutral collision frequency (Imazu 1981), which in turn reduces the damping of IAWs. Due to the inhomogeneity of the magnetic field, there is a drift of electrons and ions from the plasma that are participating in the propagation of the wave.…”

Section: Resultsmentioning

confidence: 99%

“…It also depicts that the damping increases on moving the magnet away from the grid–detector axis. Imazu (1981) has shown that for magnetic field strength, in the range of 1.5 kG to 0.1 kG, the ion–neutral collision frequency increases almost linearly. The effective field strength for this study varies from 1.43 kG to 0.24 kG, which lies within the range discussed above, consequently the ion–neutral collision increases followed by the damping.…”

Section: Resultsmentioning

confidence: 99%

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Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Deka,

Paul,

Sharma

et al. 2023

J. Plasma Phys.

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An experimental study to investigate the effect of an external magnetic field on the propagation of ion-acoustic waves (IAWs) has been carried out in hydrogen plasma containing two-temperature electrons and dust grains. It is a first step in understanding the propagation properties of IAWs in such an environment. A low-pressure hot cathode discharge method is chosen for plasma production. The desired two-electron groups with distinct temperatures are achieved by inserting two magnetic cages with a cusp-shaped magnetic field of different surface field strengths in the same chamber. The dust grains are dropped into the plasma with the help of a dust dropper, which gain negative charges by interacting with the plasma. The IAWs are excited with the help of a mesh grid inserted into the plasma. A planar Langmuir probe is used as a detector to detect the IAWs. The time-of-flight technique has been applied to measure the phase velocity of the IAWs. The results suggest that in the presence of a magnetic field, the phase velocity of IAWs increases, whereas introducing the dust particles leads to the lower phase velocity. The magnetic field is believed to have a significant effect on the wave damping. This study will aid in utilising IAWs as a diagnostic tool to estimate plasma parameters in the presence of an external magnetic field.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Deka,

Paul,

Sharma

et al. 2023

J. Plasma Phys.

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“…The gyro-radius of the ions (r Li ) is greater than the electron gyro-radius (r Le ), consequently the curvature of the ion's trajectory is smaller than the electron's trajectory, which should not affect the ion-ion collisions too. On the contrary, the presence of the magnetic field will reduce the ion-neutral collision frequency [45], which in turn reduces the damping of IAWs. The dampening of the wave rises when dust particles are introduced while the magnetic field is still present in the system.…”

Section: B Damping Study Of Iawsmentioning

confidence: 99%

“…It also depicts that the damping increases on moving the magnet away from the grid-probe axis. Imazu [45] has shown that for magnetic field strength, in the range of 1.5 kG to 0.1 kG, the ion-neutral collision frequency increases almost linearly. The effective field strength for this study varies from 1.43 kG to 0.24 kG, which lies within the range discussed above, consequently the ionneutral collision increases followed by the damping.…”

Section: B Damping Study Of Iawsmentioning

confidence: 99%

Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Deka¹,

Paul²,

Sharma³

et al. 2022

Preprint

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An experimental study to investigate the effect of an external magnetic field on the propagation of ion-acoustic waves (IAWs) has been carried out in hydrogen plasma containing two-temperature electrons and dust grains. A low-pressure hot cathode discharge method is opted for plasma production. The desired two electron groups with distinct temperatures are achieved by inserting two magnetic cages with a cusp-shaped magnetic field of different surface field strengths in the same chamber. The dust grains are dropped into the plasma with the help of a dust dropper, which gain negative charges by interacting with the plasma. The IAWs are excited with the help of a mesh-grid inserted into the plasma. A planar Langmuir probe is used as a detector to detect the IAWs. The time of flight technique has been applied to measure the phase velocity of the IAWs. The results suggest that in the presence of a magnetic field, the phase velocity of IAWs increases, whereas introducing the dust particles leads to the lower phase velocity. The magnetic field is believed to have a significant effect on the wave damping. This study will aid in utilising IAWs as a diagnostic tool to estimate plasma parameters in the presence of an external magnetic field. Moreover, the study might be useful for estimating the relative ion concentrations in a two positive ion species plasma, as well as the relative concentration of the negative ions in the presence of an external magnetic field.

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Near threshold anomalous transport in the standard map

White

Benkadda

Kassibrakis

et al. 1998

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Anomalous transport is investigated near threshold in the standard map. Very long time flights, and a large anomaly in the transport, are shown to be associated with a new form of multi-island structures causing orbit sticking. The phase space structure of these traps, and the exponents of the characteristic long time tails associated with them are determined. In general these structures are very complex, but some cases, consisting of layers of islands, allow simple modeling. (c) 1998 American Institute of Physics.

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Collision frequency of charged particles in a weekly ionized gas in a strong magnetic field

Cited by 13 publications

References 2 publications

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Effect of external magnetic field and dust grains on the properties of ion-acoustic waves

Effect of external magnetic field and dust grains on the properties of Ion Acoustic Waves

Near threshold anomalous transport in the standard map

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