The Role of Aspect Ratio and Beta in H-mode Confinement Scalings

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The addition of high power, low aspect ratio data from the NSTX and MAST experiments have motivated a new investigation of the effect of aspect ratio on confinement scaling. Various statistical methods, including those that incorporate estimates of measurement error, have been applied to datasets constrained by the standard set of criteria in addition to the range of ? and M(sub)eff appropriate to ITER operation. Development of scalings using engineering parameters as predictor variables results in ?-scaling coefficients that range from 0.38 to 1.29; the transformation of these scalings to physics variables results in an unfavorable dependence of ?? on ... continued below

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447 Kb

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Kaye, S. M.; Valovic, M.; Chudnovskiy, A.; Cordey, J. G.; McDonald, D.; Meakins, A. et al. October 20, 2005.

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The addition of high power, low aspect ratio data from the NSTX and MAST experiments have motivated a new investigation of the effect of aspect ratio on confinement scaling. Various statistical methods, including those that incorporate estimates of measurement error, have been applied to datasets constrained by the standard set of criteria in addition to the range of ? and M(sub)eff appropriate to ITER operation. Development of scalings using engineering parameters as predictor variables results in ?-scaling coefficients that range from 0.38 to 1.29; the transformation of these scalings to physics variables results in an unfavorable dependence of ?? on ?, but a favorable dependence on ?. Because the low aspect ratio devices operate at low ?(sub)T and therefore high ?(sub)T, a strong correlation exists between ? and ?, and this makes scalings based on physics variables imprecise.

Physical Description

447 Kb

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  • Related Information: Presented at the IAEA Technical Meeting on H-mode Physics and Transport Barriers, 28 - 30 September 2005, St. Petersburg, Russia.
  • Plasma Physics & Controlled Fusion 48, A429-38

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  • Report No.: PPPL-4121
  • Grant Number: DE-AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 899588
  • Archival Resource Key: ark:/67531/metadc885434

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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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  • October 20, 2005

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 18, 2016, 10:18 p.m.

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Kaye, S. M.; Valovic, M.; Chudnovskiy, A.; Cordey, J. G.; McDonald, D.; Meakins, A. et al. The Role of Aspect Ratio and Beta in H-mode Confinement Scalings, report, October 20, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc885434/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.