The momentum flux probability distribution function for ion-temperature-gradient turbulence

Anderson, Johan; Eun-jin Kim
May 2008
Physics of Plasmas;May2008, Vol. 15 Issue 5, p052306
Academic Journal
There has been overwhelming evidence that coherent structures play a critical role in determining the overall transport in a variety of systems. We compute the probability distribution function (PDF) tails of momentum flux and heat flux in ion-temperature-gradient turbulence, by taking into account the interaction among modons, which are assumed to be coherent structures responsible for bursty and intermittent events, contributing to the PDF tails. The tail of PDF of momentum flux R=〈vxvy〉 is shown to be exponential with the form exp{-ξR3/2}, which is broader than a Gaussian, similar to what was found in the previous local studies. An analogous expression with the same functional dependence is found for the PDF tails of heat flux. Furthermore, we present a detailed numerical study of the dependence of the PDF tail on the temperature and density scale lengths and other physical parameters through the coefficient ξ.


Related Articles

  • Plasma diagnostic method using intermodulation frequencies in a Langmuir probe. Kim, Dong-Hwan; Lee, Hyo-Chang; Kim, Yu-Sin; Chung, Chin-Wook // Applied Physics Letters;8/19/2013, Vol. 103 Issue 8, p084103 

    A plasma diagnostic method using intermodulation frequencies is developed. When dual-frequency (ω1,ω2) voltage signals are applied to a probe, the intermodulation frequencies (ω2±ω1, ω2±2ω1) between the signals are generated due to the nonlinearity of the sheath....

  • Analytic, nonlinearly exact solutions for an rf confined plasma. Shah, Kushal; Ramachandran, Harishankar // Physics of Plasmas;Jun2008, Vol. 15 Issue 6, p062303 

    RF confined electron plasmas are of importance in Paul traps [W. Paul, Rev. Mod. Phys. 62, 531 (1990)]. The stability of such plasmas is unclear and statistical heating arguments have been advanced to explain the observed heating in such plasmas [I. Siemers et al., Phys. Rev. A 38, 5121 (1988)]....

  • Requirements for Plasma and First Wall Measurements on ITER. Costley, A. E.; Andrew, P.; Boivin, R. L.; Ingesson, C.; Johnson, D.; Vayakis, G.; Young, K. // AIP Conference Proceedings;3/12/2008, Vol. 988 Issue 1, p27 

    In this paper we outline the process that is in use for developing the requirements for plasma and first wall measurements on ITER. These requirements are the starting point in the selection, design and integration of the individual measurement systems that together make up the ITER diagnostic...

  • Diagnostics Challenges for Burning Plasma Experiments. Donné, A. J. H.; Costley, A. E. // AIP Conference Proceedings;3/12/2008, Vol. 988 Issue 1, p17 

    Many challenges are encountered in the design of diagnostics for a burning plasma experiment commencing with the definition of the measurement requirements in a coherent way. The specific hostile environment of the burning plasma experiment gives rise to many phenomena that are new to the...

  • Physical mechanisms in industrial rf plasma sources. Chen, Francis F. // AIP Conference Proceedings;2001, Vol. 595 Issue 1, p457 

    RF plasma sources are essential for producing semiconductor chips, but they are developed empirically, with incomplete knowledge of how they work. Inductively coupled plasmas (ICPs) employ rf fields without a dc magnetic field B[sub 0] and produce ionization well outside the skin layer. Helicon...

  • Dust grains as a Diagnostic Tool for RF-Discharge Plasma. James, B. W.; Samarian, A. A.; Tsang, W. // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p90 

    Dust particles can be a useful plasma diagnostic tool. Sufficiently dust particles can be used as test grains for the visualization of the plasma potential distribution; larger dust particles can be used as specific probes to determine electron temperature. Here we report on diagnostic...

  • Comparison between observed and theoretical O IV line ratios in the UV/EUV solar spectrum as derived by SUMER, CDS and EIS. Giunta, A. S.; Fludra, A.; O'Mullane, M. G.; Summers, H. P. // Astronomy & Astrophysics / Astronomie et Astrophysique;Feb2012, Vol. 538, p1 

    Aims. The joint use of SoHO Solar UltravioletMeasurement of Emitted Radiation (SUMER), Coronal Diagnostic Spectrometer (CDS) and Hinode Extreme-ultraviolet Imaging Spectrometer (EIS) allow observation of several O IV line ratios, useful for temperature plasma diagnostics. Accurate atomic data...

  • Preface: Proceedings of the 15th Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA, 2004. Boivin, Réjean L. // Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p3381 

    This article reports that Biennial Topical Conference on High Temperature Plasma Diagnostics celebrated its 30 years of existence, in San Diego, California. As in the past, this meeting brought together scientists and engineers, to discuss mutual problems and accomplishments in the development...

  • Effect of plasma shaping on performance in the National Spherical Torus Experiment. Gates, D. A.; Maingi, R.; Menard, J.; Kaye, S.; Sabbagh, S. A.; Taylor, G.; Wilson, J. R.; Bell, M. G.; Bell, R. E.; Bernabei, S.; Bialek, J.; Biewer, T.; Blanchard, W.; Boedo, J.; Bush, C.; Carter, M. D.; Choe, W.; Crocker, N.; Darrow, D. S.; Davis, W. // Physics of Plasmas;May2006, Vol. 13 Issue 5, p056122 

    The National Spherical Torus Experiment (NSTX) has explored the effects of shaping on plasma performance as determined by many diverse topics including the stability of global magnetohydrodynamic (MHD) modes (e.g., ideal external kinks and resistive wall modes), edge localized modes (ELMs),...


Read the Article


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

Try another library?
Sign out of this library

Other Topics