Disruption mitigation studies in DIII-D

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Data on the discharge behavior, thermal loads, halo currents, and runaway electrons have been obtained in disruptions on the DIII-D tokamak. These experiments have also evaluated techniques to mitigate the disruptions while minimizing runaway electron production. Experiments injecting cryogenic impurity killer pellets of neon and argon and massive amounts of helium gas have successfully reduced these disruption effects. The halo current generation, scaling, and mitigation are understood and are in good agreement with predictions of a semianalytic model. Results from killer pellet injection have been used to benchmark theoretical models of the pellet ablation and energy loss. Runaway electrons are ... continued below

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22 p.

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Taylor, P.L.; Kellman, A.G. & Evans, T.E. January 1, 1999.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this report can be viewed below.

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Description

Data on the discharge behavior, thermal loads, halo currents, and runaway electrons have been obtained in disruptions on the DIII-D tokamak. These experiments have also evaluated techniques to mitigate the disruptions while minimizing runaway electron production. Experiments injecting cryogenic impurity killer pellets of neon and argon and massive amounts of helium gas have successfully reduced these disruption effects. The halo current generation, scaling, and mitigation are understood and are in good agreement with predictions of a semianalytic model. Results from killer pellet injection have been used to benchmark theoretical models of the pellet ablation and energy loss. Runaway electrons are often generated by the pellets and new runaway generation mechanisms, modifications of the standard Dreicer process, have been found to explain the runaways. Experiments with the massive helium gas puff have also effectively mitigated disruptions without the formation of runaway electrons that can occur with killer pellets.

Physical Description

22 p.

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INIS; OSTI as DE99001728

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  • 40. annual physics of plasmas meeting, APS Division of Plasma Physics, New Orleans, LA (United States), 16-20 Nov 1998

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  • Other: DE99001728
  • Report No.: GA--A23019
  • Report No.: CONF-981127--
  • Grant Number: AC03-99ER54463;AC05-96OR22464;AC02-76CH03073;FG03-95ER54294
  • DOI: 10.2172/319672 | External Link
  • Office of Scientific & Technical Information Report Number: 319672
  • Archival Resource Key: ark:/67531/metadc675712

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  • January 1, 1999

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 2, 2016, 5:47 p.m.

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Taylor, P.L.; Kellman, A.G. & Evans, T.E. Disruption mitigation studies in DIII-D, report, January 1, 1999; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc675712/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.