Energy loss of charged projectiles in dusty plasmas

Nasim, M. H.; Mirza, Arshad M.; Qaisar, M S; Murtaza, G.; Shukła, P. K.

doi:10.1063/1.873077

Cited by 25 publications

(15 citation statements)

References 29 publications

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“…We have numerically solved (17) for the ES potential (f) by inserting the dielectric response function from (15) for Krook type collisions and from (16) for BGK type collisions. We then plot f against the normalized axial position x z À V t t for di¡erent values of the test charge velocities with a ¢xed value of the normalized collision frequency n d0 0:2 o pd in Fig.…”

Section: E¡ect Of the Dust-neutral Collision Frequencymentioning

confidence: 99%

“…Sten£o et al [15] calculated the e¡ect of electron-neutral collisions on the potential of a slowly moving (as compared to the electron thermal motion) test charge by using the BGK collisional model. Later, Nasim et al [16] presented analytical and numerical studies describing the slowing down of heavy charged projectiles in a multi-component dusty plasma but without taking into account dust charge £uctuations. Later they also found that the dust charge £uctuation enhances the energy loss of a test charge in a dusty plasma when the charge relaxation rate is very high and vice versa [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Energy Loss of a Test Charge in Collisional Dusty Plasmas

Nasim¹,

Mirza²,

Murtaza³

et al. 2000

Phys. Scr.

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The energy loss of a test charge in an unmagnetized dusty plasma is estimated for different dust parameters (such as dust charge state, dust number density, dust charge fluctuations and dust-neutral collisions) using Krook and BGK-type collisional models. We find that the higher the dust-charge-state the more pronounced is the wake-fleld (which extends up to several Debye lengths). The variation of the dust number density shows a similar behavior. For large dust-neutral collisions a weakly damped large amplitude wake-field is observed which jumps ahead of the test charge position for higher collision frequencies. The dust neutral collisions are also found to enhance the energy loss for test charge velocities greater than the dust acoustic speeds in contrast with the dust charge fluctuations which enhances the energy loss only for test charge velocities smaller than the dust acoustic speeds.

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Section: E¡ect Of the Dust-neutral Collision Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Loss of a Test Charge in Collisional Dusty Plasmas

Nasim¹,

Mirza²,

Murtaza³

et al. 2000

Phys. Scr.

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“…Nasim et al 10,11 considered a pair of projectiles and calculated the electrostatic potential and energy loss. They pointed out that the loss or gain of energy of the second projectile depends upon its position relative to the leading projectile.…”

Section: Introductionmentioning

confidence: 99%

Effects of dust-charge fluctuations on the potential of an array of projectiles in a partially ionized dusty plasma

2003

Self Cite

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The expressions for the Debye and the wake potential are derived by incorporating dust-charge fluctuations of a single projectile, as well as of an array of dust grain projectiles, propagating through a partially ionized dusty plasma with a constant velocity. Numerically, the effects of the dust-charge fluctuations and the dust–neutral collisions on the electrostatic potential for a single, three, six and ten projectiles are examined. The dust-charge relaxation rate modifies the shape of the Debye as well as the wake potential. For smaller values of the relaxation rates a potential well is formed instead of Debye potential.

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“…An important consequence of the potential excited by a moving charge is the energy loss and braking of the velocity due to the resultant electric field at the moving charge. 19,20 The maximum energy exchange occurs for particles at the sonic speed. 21 In the case of multiple test charges, correlation effects distort the potential profile.…”

Section: Introductionmentioning

confidence: 99%

Shielding of a slowly moving test charge in a dusty plasma with dynamical grain charging

Raadu

Shafiq

2003

Physics of Plasmas

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The dynamical charging of grains in a dusty plasma enhances the shielding of test charges. Time scales for charging are determined by the ambient plasma parameters and the grain dimensions. They can be very short, approaching the ion plasma period for grain sizes of the order of an electron Debye length. For a slowly moving test charge the response potential is found as a power series in the test charge velocity. Collisional effects are included. Analytical expressions for the response potential, valid for all radial distances, are found up to second order in the test charge velocity. The first-order dynamical charging term is shown to be the consequence of the delay in the shielding due to the dynamics of the charging process. The remaining first-order terms are given by analytical expressions that yield the well known asymptotic power law forms for large distances.

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Energy loss of charged projectiles in dusty plasmas

Cited by 25 publications

References 29 publications

Energy Loss of a Test Charge in Collisional Dusty Plasmas

Energy Loss of a Test Charge in Collisional Dusty Plasmas

Effects of dust-charge fluctuations on the potential of an array of projectiles in a partially ionized dusty plasma

Shielding of a slowly moving test charge in a dusty plasma with dynamical grain charging

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