Magnetic fluctuations due to pressure driven instabilities in ATF

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The Advanced Toroidal Facility (ATF) was designed to have stable access to the second stability regime. For the design conditions, this should occur at beta values near ..beta../sub 0/ approx. 5%. In its initial phase of operation, the ATF plasma minor radius and the edge rotational transform, xi/sub a/, were reduced by field errors, which have now been repaired. This reduction in radius and xi/sub a/ caused a large increase in the Shafranov shifts, and as a consequence a reduction in the beta value needed to access the second stability regime. From the low-n and high-n stability analysis using the ... continued below

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Pages: 5

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Charlton, L.A.; Carreras, B.A.; Leboeuf, J.N. & Lynch, V.E. January 1, 1989.

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Description

The Advanced Toroidal Facility (ATF) was designed to have stable access to the second stability regime. For the design conditions, this should occur at beta values near ..beta../sub 0/ approx. 5%. In its initial phase of operation, the ATF plasma minor radius and the edge rotational transform, xi/sub a/, were reduced by field errors, which have now been repaired. This reduction in radius and xi/sub a/ caused a large increase in the Shafranov shifts, and as a consequence a reduction in the beta value needed to access the second stability regime. From the low-n and high-n stability analysis using the experimentally measured profiles, the threshold to second stability was found to be as low as ..beta../sub 0/ approx. 1.0%. The beta values reached in the experiment, up to ..beta../sub 0/ approx. 3.0%, are well above this threshold value. The magnetic fluctuation measurements showed a reduction in the fluctuation level for ..beta../sub 0/ greater than or equal to 2%. In this paper, we discuss the results of simulations of the poloidal magnetic field fluctuations based on the resistive pressure-gradient-driven model. 8 refs., 2 figs.

Physical Description

Pages: 5

Notes

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

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

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  • Other: DE89012337
  • Report No.: CONF-890403-19
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6026993
  • Archival Resource Key: ark:/67531/metadc1097636

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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.

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  • January 1, 1989

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 18, 2018, 12:20 p.m.

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Charlton, L.A.; Carreras, B.A.; Leboeuf, J.N. & Lynch, V.E. Magnetic fluctuations due to pressure driven instabilities in ATF, article, January 1, 1989; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1097636/: accessed May 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.