A Monte Carlo method is described to model the mobility and diffusion of ions drifting in response to an electric field in a neutral gas. The model uses a collision frequency that is dependent upon the ion velocity and neutral gas thermal velocity. When implemented with a constant collision cross section for momentum transfer, the model gives a mobility that is constant for small electric field...

Abstract A novel scheme has been developed to show that the observed phase behavior associated with subpulse drifting from two pulsars, J1034−3224 and J1720−2933, can be used obtain magnetic field configuration in partially screened gap (PSG). The outflowing plasma along open line region of pulsars is generated as a result spark discharges an inner acceleration (IAR) above polar cap. IAR modele...

Systematic measurements on the rate capability of thin MWPCs operated in Xenon, Argon and Neon mixtures using CO 2 as UV-quencher are presented. A good agreement between data and existing models has been found, allowing us to present the rate capability of MWPCs in a comprehensive way and ultimately connect it with the mobilities of the drifting ions.

The ion drag force acting on dust grains was measured experimentally in a low-pressure Ar plasma in the regime of strong ion-grain coupling. Argon ions were drifting in the axial ambipolar electric field naturally present in a hot-filament dc discharge plasma. Following the method of Hirt et al. Phys. Plasmas 11, 569

Recent work by Rankin & Deshpande strongly suggests that there exist strong " micro-storms " rotating around the magnetic axis of the 1.1s pulsar PSR 0943+10. Such a feature hints that most probably the large-voltage vacuum gap proposed by Ruderman & Sutherland (RS) does exist in the pulsar polar cap. However, there are severe arguments against the formation of the RS-type gap in pulsars, since...

We use the High Current Experiment (HCX) to study three mitigation measures: a rough surface to reduce electron emission and gas desorption from ions striking walls near grazing incidence, a suppressor electrode after the magnets to block beam-induced electrons off the end structures from drifting upstream, and clearing electrodes to remove electrons from drift regions between magnets. We find ...

The dispersion properties and excitation mechanisms of ‘dipole oscillons’ in a dusty plasma containing charged elongated rod-like dust grains are investigated in the presence of streaming plasma particles for cases without and with an external static magnetic field. In a magnetized dusty plasma, a new ‘oscillon-ion lower-hybrid’ mode is found, which can be excited by the equilibrium energy of c...

The problem of formation of the inner vacuum gap in neutron stars with Ω · B < 0 is considered. It is argued by means of the condition Ti/Ts > 1, where Ti is the melting temperature of surface 56 26Fe ions and Ts is the actual temperature of the polar cap surface, that the inner vacuum gap can form, provided that the actual surface magnetic field is extremaly strong (Bs> ∼ 10 13 G) and curved (...

A one-dimensional model of a small plasma ion source 10 cm long is studied. A hybrid simulation where ions are treated as particles and electrons as a fluid obeying the Boltzmann relation is used to investigate ion heating in the plasma presheath. At low pressure below a few mTorr , the ion velocity distribution is Maxwellian in the bulk and becomes a drifting Maxwellian distribution while tran...