Hydrodynamic effects of eroded materials on response of plasma-facing component during a tokamak disruption

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Loss of plasma confinement causes surface and structural damage to plasma-facing materials (PFMs) and remains a major obstacle for tokamak reactors. The deposited plasma energy results in surface erosion and structural failure. The surface erosion consists of vaporization, spallation, and liquid splatter of metallic materials, while the structural damage includes large temperature increases in structural materials and at the interfaces between surface coatings and structural members. Comprehensive models (contained in the HEIGHTS computer simulation package) are being used self-consistently to evaluate material damage. Splashing mechanisms occur as a result of volume bubble boiling and liquid hydrodynamic instabilities and brittle destruction ... continued below

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28 p.

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Hassanein, A. & Konkashbaev, I. October 25, 1999.

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Description

Loss of plasma confinement causes surface and structural damage to plasma-facing materials (PFMs) and remains a major obstacle for tokamak reactors. The deposited plasma energy results in surface erosion and structural failure. The surface erosion consists of vaporization, spallation, and liquid splatter of metallic materials, while the structural damage includes large temperature increases in structural materials and at the interfaces between surface coatings and structural members. Comprehensive models (contained in the HEIGHTS computer simulation package) are being used self-consistently to evaluate material damage. Splashing mechanisms occur as a result of volume bubble boiling and liquid hydrodynamic instabilities and brittle destruction mechanisms of nonmelting materials. The effect of macroscopic erosion on total mass losses and lifetime is evaluated. The macroscopic erosion products may further protect PFMs from severe erosion (via the droplet-shielding effect) in a manner similar to that of the vapor shielding concept.

Physical Description

28 p.

Notes

INIS; OSTI as DE00750556

Medium: P; Size: 28 pages

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  • ICFRM (9th International Conference on Fusion Reactor Materials), Colorado Springs, CO (US), 10/10/1999--10/15/1999

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  • Report No.: ANL/ET/CP-100288
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750556
  • Archival Resource Key: ark:/67531/metadc706114

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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.

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  • October 25, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 6:57 p.m.

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Hassanein, A. & Konkashbaev, I. Hydrodynamic effects of eroded materials on response of plasma-facing component during a tokamak disruption, article, October 25, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc706114/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.