Potential safe termination by injection of polypropylene pellets in JET

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Thermal energy and the magnetic field energy associated with the plasma current must be dissipated safely when a tokamak discharge is terminated in a disruption. Magnetic energy can be dissipated by impurity radiation if position control is maintained. Prior to the dissipation of magnetic energy, thermal energy is usually conducted to the plasma contact points on a 1ms time scale in a thermal quench. A resistive, highly radiating plasma formed prior to the thermal quench, might dissipate both the thermal and magnetic energy by radiation minimizing damage due to local deposition. High speed injection of a low Z material can ... continued below

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4 p.

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Schmidt, G.L.; Ali-Arshad, S. & Bartlett, D. October 1, 1995.

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Description

Thermal energy and the magnetic field energy associated with the plasma current must be dissipated safely when a tokamak discharge is terminated in a disruption. Magnetic energy can be dissipated by impurity radiation if position control is maintained. Prior to the dissipation of magnetic energy, thermal energy is usually conducted to the plasma contact points on a 1ms time scale in a thermal quench. A resistive, highly radiating plasma formed prior to the thermal quench, might dissipate both the thermal and magnetic energy by radiation minimizing damage due to local deposition. High speed injection of a low Z material can produce a resistive, highly radiating plasma on a 1ms time scale. Neon has recently been used in such an application on JT60-U. A large carbon pellet producing dilution temperatures < 1 keV is a possible alternative. This paper summarizes the results of an initial experiment performed in JET using carbon injected at high speed, as a 6mm polypropylene pellet, to investigate this potential approach to a safe plasma termination.

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4 p.

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INIS; OSTI as DE96001109

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  • 22. European Physical Society conference on controlled fusion and plasma physics, Bournmouth (United Kingdom), 3-7 Jul 1995

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  • Other: DE96001109
  • Report No.: DOE/CH/03073--T74
  • Report No.: CONF-9507182--1
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 114565
  • Archival Resource Key: ark:/67531/metadc621676

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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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  • October 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 15, 2016, 6:49 p.m.

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Schmidt, G.L.; Ali-Arshad, S. & Bartlett, D. Potential safe termination by injection of polypropylene pellets in JET, article, October 1, 1995; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc621676/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.