Edge plasma control by a local island divertor in the Compact Helical System

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Description

A local island divertor (LID) experiment was performed on the Compact Helical System (CHS) to demonstrate the principle of the LID. It was clearly demonstrated that the particle flow is controlled by adding a resonant perturbation field to the CHS magnetic configuration, and is guided to the back of an m/n = 1/1 island which is created by the perturbation field. The particles recycled there were pumped out with a pumping rate in the range from a few percent to about 10%. As a result, the line averaged core density was reduced by a factor of about 2 in comparison ... continued below

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10 p.

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Komori, A.; Ohyabu, N. & Masuzaki, S. December 31, 1997.

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Description

A local island divertor (LID) experiment was performed on the Compact Helical System (CHS) to demonstrate the principle of the LID. It was clearly demonstrated that the particle flow is controlled by adding a resonant perturbation field to the CHS magnetic configuration, and is guided to the back of an m/n = 1/1 island which is created by the perturbation field. The particles recycled there were pumped out with a pumping rate in the range from a few percent to about 10%. As a result, the line averaged core density was reduced by a factor of about 2 in comparison with non-LID discharges at the same gas puffing rate. In addition to the demonstration of these fundamental divertor functions, a modest improvement of energy confinement was observed, which could be attributed to the edge plasma control by the LID.

Physical Description

10 p.

Notes

INIS; OSTI as DE98001927

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  • 16. International Atomic Energy Agency (IAEA) fusion energy conference, Montreal (Canada), 7-11 Oct 1997

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  • Other: DE98001927
  • Report No.: ORNL/CP--95578
  • Report No.: IAEA-CN--64/C1-2;CONF-9710100--
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/564263 | External Link
  • Office of Scientific & Technical Information Report Number: 564263
  • Archival Resource Key: ark:/67531/metadc696028

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  • December 31, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 25, 2016, 6:42 p.m.

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Komori, A.; Ohyabu, N. & Masuzaki, S. Edge plasma control by a local island divertor in the Compact Helical System, report, December 31, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc696028/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.