Ideal low-n and Mercier mode stability boundaries for /ell/ = 2 torsatrons

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We studied the relationship between the stability properties of ideal low-n-internal modes and the three-dimensional (3-D) ideal Mercier criterion for /ell/ = 2 torsatron configurations. For the low-n stability studies, we used the stellarator expansion as implemented in the FAR code. The 3-D Mercier criterion was applied to equilibria calculated with the VMEC code. We found that low-n modes with singular surfaces lying in a Mercier region are, in general, unstable and the critical beta given by the Mercier criterion agrees well with the critical beta for the lowest-n unstable mode. This is verified even in the case of global … continued below

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6 pages

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Dominguez, N. January 1, 1989.

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We studied the relationship between the stability properties of ideal low-n-internal modes and the three-dimensional (3-D) ideal Mercier criterion for /ell/ = 2 torsatron configurations. For the low-n stability studies, we used the stellarator expansion as implemented in the FAR code. The 3-D Mercier criterion was applied to equilibria calculated with the VMEC code. We found that low-n modes with singular surfaces lying in a Mercier region are, in general, unstable and the critical beta given by the Mercier criterion agrees well with the critical beta for the lowest-n unstable mode. This is verified even in the case of global n = 1 modes. Therefore, the 3-D Mercier criterion is a useful guide in mapping the ideal stability beta limits for these torsatron configurations. 5 refs., 5 figs.

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6 pages

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NTIS, PC A02/MF A01 - OSTI; 1.

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  • 7. international stellerator workshop, Oak Ridge, TN, USA, 10 Apr 1989

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  • Other: DE89010837
  • Report No.: CONF-890403-1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6164916
  • Archival Resource Key: ark:/67531/metadc1104694

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  • January 1, 1989

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  • Feb. 22, 2018, 7:45 p.m.

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  • May 1, 2019, 4:55 p.m.

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Dominguez, N. Ideal low-n and Mercier mode stability boundaries for /ell/ = 2 torsatrons, article, January 1, 1989; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1104694/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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