TITLE

Poloidal velocity of impurity ions in neoclassical theory

AUTHOR(S)
Wong, S. K.; Chan, V. S.; Solomon, W. M.
PUB. DATE
August 2008
SOURCE
Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p082503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A formula for the poloidal velocity of impurity ions in a two-species plasma is derived from neoclassical theory in the banana regime, with corrections from the boundary layer separating the trapped and transiting ions. The formula is applicable to plasmas with toroidal rotations that can approach the thermal speeds of the ions. Using the formula to determine the poloidal velocity of C+6 ions in a recently reported experiment [W. M. Solomon et al., Phys. Plasmas 13, 056116 (2006)] leads to agreement in the direction of the central region when it is otherwise from theories without strong toroidal rotations. Comparisons among these theories are made, demonstrating the degree of uncertainty of theoretical predictions.
ACCESSION #
34169242

 

Related Articles

  • Internal kink mode stabilization and the properties of auxiliary heated ions. Graves, Jonathan P. // Physics of Plasmas;Sep2005, Vol. 12 Issue 9, p090908 

    The stability of the internal kink mode is analyzed in terms of the essential properties of auxiliary heated ions. A fundamental difference between fusion born alpha particles and auxiliary heated ions is that the latter are typically anisotropically distributed. The effect of anisotropy, which...

  • Effects of the radial electric field on the confinement of trapped fast ions in the Wendelstein 7-X and Helias reactor. Kolesnichenko, Ya. I.; Lutsenko, V. V.; Tykhyy, A. V.; Weller, A.; Werner, A.; Wobig, H.; Geiger, J. // Physics of Plasmas;Jul2006, Vol. 13 Issue 7, p072504 

    Confinement of trapped fast ions in the Wendelstein-line stellarators in the presence of the radial electric field, Er, is studied. It is shown that negative electric field improves the confinement; in particular, a radially localized field can play the role of a transport barrier for the ions...

  • Trapping of hydrogen in argon-implanted crystalline silicon. Ma, Y.; Job, R.; Düngen, W.; Huang, Y. L.; Fahrner, W. R.; Beaufort, M. F.; Rousselet, S.; Horstmann, J. T. // Applied Physics Letters;6/20/2005, Vol. 86 Issue 25, p252109 

    Crystalline silicon wafers are implanted with argon ions and subsequently hydrogenated by H-plasma treatments (Sample A). The control silicon samples are solely treated by the H-plasma under identical conditions (Sample B). Depth-resolved μ-Raman spectroscopy and cross-sectional transmission...

  • 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...

  • 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...

  • 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...

  • Experimental studies of transverse metastable ion velocity distribution functions in the presheath of a weakly collisional argon plasma. Dongsoo Lee; Hershkowitz, Noah; Severn, Greg // Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p083503 

    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...

  • 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...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics