A Fast Shutdown Technique for Large Tokamaks

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Description

A practical method is proposed for the fast shutdown of a large ignited tokamak. The method consists of injecting a rapid series of 30-50 deuterium pellets doped with a small ( 0.0005%) concentration of Krypton impurity, and simultaneously ramping the plasma current and shaping fields down over a period of several seconds using the poloidal field system. Detailed modeling with the Tokamak Simulation Code using a newly developed pellet mass deposition model shows that this method should terminate the discharge in a controlled and stable way without producing significant numbers of runaway electrons. A partial prototyping of this technique was ... continued below

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268 Kilobytes pages

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Fredrickson, E.; Schmidt, G.L.; Hill, K.; Jardin, S.C. & al, et September 1, 1999.

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Description

A practical method is proposed for the fast shutdown of a large ignited tokamak. The method consists of injecting a rapid series of 30-50 deuterium pellets doped with a small ( 0.0005%) concentration of Krypton impurity, and simultaneously ramping the plasma current and shaping fields down over a period of several seconds using the poloidal field system. Detailed modeling with the Tokamak Simulation Code using a newly developed pellet mass deposition model shows that this method should terminate the discharge in a controlled and stable way without producing significant numbers of runaway electrons. A partial prototyping of this technique was accomplished in TFTR.

Physical Description

268 Kilobytes pages

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INIS; OSTI as DE00012204

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  • Other Information: PBD: 1 Sep 1999

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  • Report No.: PPPL-3356
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/12204 | External Link
  • Office of Scientific & Technical Information Report Number: 12204
  • Archival Resource Key: ark:/67531/metadc626848

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  • September 1, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 15, 2016, 9:19 p.m.

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Fredrickson, E.; Schmidt, G.L.; Hill, K.; Jardin, S.C. & al, et. A Fast Shutdown Technique for Large Tokamaks, report, September 1, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc626848/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.