Evolution of toroidal flow during, after mode locking

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Description

The response of the toroidal flow velocity to the abrupt locking of it in the vicinity of a magnetohydrodynamic (MHD) tearing-mode- induced magnetic island is examined analytically and numerically using a diffusive transport model in a cylindrical plasma model. The resultant toroidal momentum confinement is shown to degrade significantly after mode locking, as is often observed on many tokamaks and reversed field pinches (RFPs). The degraded toroidal momentum confinement time in the core and edge regions of the plasma are evaluated and compared to experimental observations, The mode locking time scale itself is also investigated by using a model toroidal ... continued below

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19 p.

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Yokoyama, M.; Callen, J.D. & Hegna, C.C. November 1, 1995.

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Description

The response of the toroidal flow velocity to the abrupt locking of it in the vicinity of a magnetohydrodynamic (MHD) tearing-mode- induced magnetic island is examined analytically and numerically using a diffusive transport model in a cylindrical plasma model. The resultant toroidal momentum confinement is shown to degrade significantly after mode locking, as is often observed on many tokamaks and reversed field pinches (RFPs). The degraded toroidal momentum confinement time in the core and edge regions of the plasma are evaluated and compared to experimental observations, The mode locking time scale itself is also investigated by using a model toroidal torque balance equation. The decrease of mode frequency during mode locking seems to be governed mainly by the electromagnetic torque exerted on the resistive layer. For tokamak plasmas, the mode locking time scale is found to be much shorter than the diffusion time scale, which is in general agreement with experimental observations.

Physical Description

19 p.

Notes

INIS; OSTI as DE96009528

Medium: P; Size: 19 p.

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  • Other Information: PBD: Nov 1995

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  • Other: DE96009528
  • Report No.: UW-CPTC--95-4
  • Grant Number: FG02-86ER53218;FG02-92ER54139
  • DOI: 10.2172/230342 | External Link
  • Office of Scientific & Technical Information Report Number: 230342
  • Archival Resource Key: ark:/67531/metadc672823

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • November 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 7, 2017, 6:55 p.m.

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Yokoyama, M.; Callen, J.D. & Hegna, C.C. Evolution of toroidal flow during, after mode locking, report, November 1, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc672823/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.