Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches

Dennis, G. R.; Hudson, S. R.; Terranova, D.; Franz, P.; Dewar, R. L.; Hole, M. J.

doi:10.1103/PhysRevLett.111.055003

Title: Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches

Full Record
Other Related Research

Authors:: Dennis, G. R.; Hudson, S. R.; Terranova, D.; Franz, P.; Dewar, R. L.; Hole, M. J.

Publication Date:: Tue Jul 30 00:00:00 EDT 2013

Sponsoring Org.:: USDOE

OSTI Identifier:: 1104342

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 111; Journal Issue: 5; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Dennis, G. R., Hudson, S. R., Terranova, D., Franz, P., Dewar, R. L., and Hole, M. J. Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches.  United States: N. p., 2013. 
Web.  doi:10.1103/PhysRevLett.111.055003.

Copy to clipboard


                    Dennis, G. R., Hudson, S. R., Terranova, D., Franz, P., Dewar, R. L., & Hole, M. J. Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches.  United States.  https://doi.org/10.1103/PhysRevLett.111.055003

Copy to clipboard


                    Dennis, G. R., Hudson, S. R., Terranova, D., Franz, P., Dewar, R. L., and Hole, M. J. Tue .  
"Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches".  United States.  https://doi.org/10.1103/PhysRevLett.111.055003.

Copy to clipboard


                    
@article{osti_1104342,

  title        = {Minimally Constrained Model of Self-Organized Helical States in Reversed-Field Pinches},

  author       = {Dennis, G. R. and Hudson, S. R. and Terranova, D. and Franz, P. and Dewar, R. L. and Hole, M. J.},

  abstractNote = {},

  doi          = {10.1103/PhysRevLett.111.055003},

  journal      = {Physical Review Letters},

  number       = 5,

  volume       = 111,

  place        = {United States},

  year         = {Tue Jul 30 00:00:00 EDT 2013},

  month        = {Tue Jul 30 00:00:00 EDT 2013}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.111.055003

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 20 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Self-Organized Helical Equilibria in the RFX-Mod Reversed Field Pinch

Conference Terranova, D ; Gobbin, M ; Boozer, A H ; ...

With operation at high plasma current (Ip similar to 1.5 MA), the plasma in the RFX-mod reversed field pinch self-organises in a 3D helical state with almost conserved flux surfaces featuring strong electron temperature barriers. Up to now the equilibrium of such states was obtained by a perturbative solution of the Newcomb equation in toroidal geometry. This allowed for the mapping of the electron temperature, density and SXR emissivity profiles on helical flux surfaces thus proving the correlation between kinetic plasma quantities and the underlying helical magnetic topology. In order to obtain a full 3D equilibrium reconstruction, the magnetic topologymore »« less
Quasi-single helicity state at shallow reversal in TPE-RX reversed-field pinch experiment

Journal Article Hirano, Y ; Paccagnella, R ; Koguchi, H ; ... - Physics of Plasmas

The operating conditions for obtaining a quasi-single helicity (QSH) state with a good reproducibility are found in a reversed-field pinch (RFP) experiment on the large RFP machine, TPE-RX [Y. Yagi et al., Fusion Eng. Des. 45, 421 (1999)]. In these conditions, the reversal of toroidal magnetic field (B{sub ta}) is maintained at a very shallow value ({approx}-0.2 mT) after the setting up phase and the following fast current rising phase. After a certain period at this shallow reversal ({approx}15-25 ms), the m/n=1/6 mode (m and n being the poloidal and toroidal Fourier mode numbers, respectively) rapidly grows and saturates beforemore »« less
https://doi.org/10.1063/1.2118728
Effects of the resistivity profile on the formation of a reversed configuration and single helicity states in compressible simulations of the reversed-field pinch

Journal Article Onofri, M. ; Malara, F. - Physics of Plasmas

Compressible magnetohydrodynamics simulations of the reversed-field pinch (RFP) are presented. Previous simulations of the RFP, including density and pressure evolution, showed that a stationary state with a reversed toroidal magnetic field could not be obtained, contrary to the results produced with numerical codes neglecting density and pressure dynamics. The simulations described in the present paper show that including density and pressure evolution, a stationary RFP configuration can be obtained if the resistivity has a radial profile steeply increasing close to the wall. Such resistivity profile is more realistic than a uniform resistivity, since the temperature at the wall is lowermore » than in the plasma core.« less
https://doi.org/10.1063/1.4826222
Quasi-single helicity state by a small positive pulse of toroidal magnetic field in TPE-RX reversed field pinch experiment

Journal Article Hirano, Y ; Koguchi, H ; Yambe, K ; ... - Physics of Plasmas

By applying a small positive pulse ({delta}B{sub ta}) in toroidal magnetic field, the quasi-single helicity (QSH) state can be obtained with a controllable and reproducible manner in a reversed-field pinch (RFP) experiment on the large RFP machine, TPE-RX [Y. Yagi et al., Fusion Eng. Des. 45, 421 (1999)]. The QSH state in RFP is one of the states where the improved confinement can be observed, and is important for development toward the pure single helicity (SH) state. In the SH state, the dynamo-action for sustaining the RFP configuration will be driven by a single helical mode and its harmonics, andmore »« less
https://doi.org/10.1063/1.2405343
Saturation of tearing modes in reversed field pinches with locally linear force-free magnetic fields and its application to quasi-single-helicity states

Journal Article Tassi, E ; Porcelli, F ; Militello, F ; ... - Physics of Plasmas

A simple formula for predicting the width of a saturated island, formed as a consequence of tearing perturbation of linear force-free fields in cylindrical geometry, is derived. The formula makes it possible to calculate the saturated island width in terms of the values of parameters characterizing the initial force-free equilibrium and can be applied to equilibria of interest for reversed field pinches. In particular it is applied, in this paper, to force-free equilibria with piecewise constant radial profile of the pinch parameter, which have been recently suggested to be relevant for the formation of quasi-single-helicity states. The main result ismore »« less
https://doi.org/10.1063/1.2913263

Similar Records