Experimental studies of transverse metastable ion velocity distribution functions in the presheath of a weakly collisional argon plasma

Dongsoo Lee; Hershkowitz, Noah; Severn, Greg
August 2008
Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p083503
Academic Journal
Laser-induced fluorescence measurements of the transverse metastable ion velocity distribution function near a negatively biased plate in a low temperature (Te<1 eV), low pressure (p0<1 mTorr) dc multi-dipole argon discharge plasma have been made with a diode laser. The metastable argon ions in the 3s23p4(3P)3d4F7/2 state are found to be characterized by a Maxwellian temperature transverse to the direction normal to the plate. For a neutral pressure of 0.3 mTorr, the transverse temperature increases along the presheath from 0.026 eV in the bulk plasma to 0.058 eV at the presheath sheath boundary.


Related Articles

  • Dust acoustic waves in a magnetized anodic plasma. Trottenberg, Thomas; Block, Dietmar; Piel, Alexander // AIP Conference Proceedings;2005, Vol. 799 Issue 1, p510 

    Dust acoustic waves (DAW) in a particle cloud trapped in an anodic argon plasma are investigated. At certain parameters self-excited waves are observed. In stable or weakly unstable regimes DAWs can be excited externally. The experimental data is critically compared with fluid and kinetic...

  • Drag coefficient of the weakly ionized plasma in the high Knudsen number regime. Hong-Yu Chu; Man-Chon Si; Shang-Bin Lin // Physics of Plasmas;Jun2009, Vol. 16 Issue 6, p063704 

    The drag force acting on a micron-sized polystyrene particle in the high Knudsen number regime is investigated. Analysis of the particle trajectories in stationary neutral argon gas environment suggests the damping time constant τ∝p-1.20±0.04 and Epstein drag force coefficient...

  • The effect of gas flow on argon plasma discharge generated with a single-electrode configuration at atmospheric pressure. Shou-Zhe Li; Wen-Tong Huang; Dezhen Wang // Physics of Plasmas;Sep2009, Vol. 16 Issue 9, p093501 

    A long atmospheric-pressure plasma column confined in a dielectric tube is generated in argon with use of a single-electrode configuration driven with a sinusoidal power supply operating at 45 kHz. The electrical characteristics are investigated by means of measuring voltage-current and...

  • Ion beam formation in a low-pressure geometrically expanding argon plasma. Corr, C. S.; Zanger, J.; Boswell, R. W.; Charles, C. // Applied Physics Letters;12/10/2007, Vol. 91 Issue 24, p241501 

    Supersonic ion beam formation has been observed in a geometrically expanding low-pressure inductively coupled argon plasma. It is found that the ion beam is only observed below 3 mTorr and only when the discharge is operated in inductive mode. The geometrical expansion of the plasma induces...

  • Modeling positive ion current to a planar probe in low-pressure electronegative discharges. Chung, T. H. // Physics of Plasmas;Jun2009, Vol. 16 Issue 6, p063503 

    A fluid model is utilized to describe the plasma-sheath boundary for a negatively biased planar probe immersed in electronegative plasmas. The model equations are solved on the scale of the electron Debye length and calculate the spatial distributions of electric potential, velocity, and density...

  • Calculation of resistive magnetohydrodynamics and two-fluid tearing modes by example of reversed-field-pinch-like plasma. Svidzinski, V. A.; Li, H. // Physics of Plasmas;May2008, Vol. 15 Issue 5, p052106 

    An algorithm suitable for numerical solution of linear eigenmode problems in resistive magnetohydrodynamics (MHD) and two-fluid MHD models without prior approximations is presented. For these plasma models, sets of equations suitable for numerical solution are derived and the details of the...

  • Design of the new magnetic sensors for Joint European Torus. Coccorese, V.; Albanese, R.; Altmann, H.; Cramp, S.; Edlington, T.; Fullard, K.; Gerasimov, S.; Huntley, S.; Lam, N.; Loving, A.; Riccardo, V.; Sartori, F.; Marren, C.; McCarron, E.; Sowden, C.; Tidmarsh, J.; Basso, F.; Cenedese, A.; Chitarin, G.; DegliAgostini, F. // Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p4311 

    A new magnetic diagnostics system has been designed for the 2005 Joint European Torus (JET) experimental campaigns onward. The new system, which adds to the existing sensors, aims to improve the JET safety, reliability, and performance, with respect to: (i) equilibrium reconstruction; (ii)...

  • Gyrokinetic verification of the persistence of kinetic ballooning modes in the magnetohydrodynamic second stability regime. Joiner, N.; Hirose, A. // Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p082107 

    The kinetic ballooning mode (KBM) has been shown in previous work to be unstable within the magnetohydrodynamic (MHD) region (in s⁁-α space) of second stability [Hirose et al., Phys. Rev. Lett. 72, 3993 (2004)]. In this work we verify this result using the gyrokinetic code GS2...

  • Critical Δ′ for stability of viscoresistive tearing modes. Grasso, D.; Hastie, R. J.; Porcelli, F.; Tebaldi, C. // Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072113 

    An analytic expression for the stability threshold of linear tearing modes is derived. The magnetized plasma is described in terms of a standard viscoresistive magnetohydrodynamic model. The analytic derivation requires an extension of the standard layer equation that represents an approximation...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics