TITLE

Anomalous impurity ion heating from Alfvénic cascade in the reversed field pinch

AUTHOR(S)
Tangri, Varun; Terry, P. W.; Fiksel, Gennady
PUB. DATE
November 2008
SOURCE
Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p112501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Anomalous ion and impurity heating in reversed field pinch plasmas is addressed. Previous work [N. Mattor et al., Comments Plasma Phys. Controlled Fusion 15, 65 (1992)], which calculated the heating of bulk ions by gyro and Landau resonances with turbulent fluctuations cascading from unstable tearing modes, is extended to impurity species measured in Madison symmetric torus (MST). The heavier mass of impurities allows gyro-resonant heating at lower frequencies where more energy is present in the fluctuations. A 0D transport model is used to examine heating rates under various time-dependent, experimental heating scenarios, such as a sawtooth crash. Impurity heating rates calculated for impurities found in MST are comparable to observed rates inferred in the impurity temperature rise during sawtooth events.
ACCESSION #
35541252

 

Related Articles

  • Heating of ions by low-frequency Alfven waves. Quanming Lu; Xing Li // Physics of Plasmas;Apr2007, Vol. 14 Issue 4, p042303 

    This paper reports a new physical mechanism that enables the heating of ions by a low-frequency parallel propagating Alfven wave of finite amplitude in a low beta plasma. The heating does not rely on ion cyclotron resonance. The process has two stages: First, ions, whose initial average velocity...

  • Electron temperature and fluctuation correlation measurements using dual analyzers with a heavy ion beam probe. Michael, J. D.; Saravia, E.; Hickok, R. L.; Jennings, W. C. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p1828 

    A heavy ion beam probe has been operated with two separate electrostatic energy analyzers to allow simultaneous detection of 2[sup +] and 3[sup +] secondary ions coming from a singly charged probing beam. This configuration provides rapid, spatially resolved measurements of the electron...

  • Microwave scattering system design for ρe scale turbulence measurements on NSTX. Smith, D. R.; Mazzucato, E.; Munsat, T.; Park, H.; Johnson, D.; Lin, L.; Domier, C. W.; Johnson, M.; Luhmann, N. C. // Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p3840 

    This article presents information on the design of microwave scattering system. Recent theory work, gyrokinetic simulations, and Tore Supra experimental results have highlighted the importance of electron thermal transport. High-k core turbulence measurements are needed to confirm the existence...

  • High-energy components and collective modes in thermonuclear plasmas. Coppi, B.; Cowley, S.; Kulsrud, R.; Detragiache, P.; Pegoraro, F. // Physics of Fluids (00319171);Dec86, Vol. 29 Issue 12, p4060 

    The theory of a class of collective modes of a thermonuclear magnetically confined plasma, with frequencies in the range of the ion-cyclotron frequency and of its harmonics, is presented. These modes can be excited by their resonant cyclotron interaction with a plasma component of relatively...

  • Transport of impure plasma with arbitrary toroidal rotation. Wong, Seung Kai // Physics of Fluids (00319171);Mar87, Vol. 30 Issue 3, p818 

    A previous formulation of neoclassical transport for an axisymmetric plasma with arbitrary toroidal rotation is generalized to plasmas with impurity ions. Calculations in the banana regime for a two-ion species plasma for large aspect circular flux surfaces show significant enhancement of both...

  • Observations of Anisotropic Ion Temperature during RF Heating in the NSTX Edge. Biewer, T.M.; Bell, R.E.; Darrow, D.S.; Wilson, J.R. // AIP Conference Proceedings;2003, Vol. 694 Issue 1, p193 

    A new spectroscopic diagnostic on the National Spherical Torus Experiment (NSTX) measures the velocity distribution of ions in the plasma edge with both poloidal and toroidal views. An anisotropic ion temperature is measured during the presence of high power HHFW RF heating in He plasmas, with...

  • Role of Combined NNBI and ICRH Heating in FAST H-mode plasmas. Cardinali, A.; Calabrò, G.; Di Troia, C.; Marinucci, M.; Baiocchi, B.; Bilato, R.; Brambilla, M.; Briguglio, S.; Fogaccia, G.; Mantica, P.; Vlad, G.; Zonca, F. // AIP Conference Proceedings;12/23/2011, Vol. 1406 Issue 1, p353 

    The combination of ICRH+NNBI in FAST allows the generation of fast ion populations with different velocity space anisotropy and radial profiles. These energetic ion populations can excite meso-scale fluctuations with the same characteristics of those expected in reactor conditions and, for this...

  • On the Mechanism of the External Magnetic Field Action on the Electron Temperature and Ion Charge State Distribution in a Vacuum Arc Plasma. Krinberg, I. A. // Technical Physics Letters;Jun2003, Vol. 29 Issue 6, p504 

    When an external axial magnetic field is applied to a vacuum arc, the radial expansion of plasma from cathode spots transforms into a plasma flow along the magnetic field, provided that the electron-ion collision frequency is smaller than the Larmor frequency. As the magnetic field strength...

  • Heat flux measurements and plasma composition. Makrinich, G.; Fruchtman, A. // Journal of Applied Physics;11/1/2006, Vol. 100 Issue 9, p093302 

    Measurements of heat flux into a probe in plasma, combined with measurement of electron temperature, are used to extract information about the plasma composition. In particular, such measurements in oxygen and nitrogen plasmas at a pressure of several millitorrs indicate that these plasmas are...

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