Distinguishing Gyro-Bohm and Bohm scaling in stellarators

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With statistical analysis of global data from one, two and four stellarators, it is possible to draw limited conclusions whether Gyro- Bohm or Bohm scaling prevails. Either scaling may be favored, depending on whether corrections are included for possible {Beta} and v{sub *} corrections and whether all data are taken, or selected cases with low collisionality, or low net toroidal current, or with ECH heating applied, and so on. Monte Carlo-like simulations are used to test reliability of inferences about power-law scaling exponents made from data having substantial statistical variance and collinearity of control parameters. These show that for reliable ... continued below

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Dory, R.A.; Murakami, M. & Stroth, U. May 5, 1993.

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With statistical analysis of global data from one, two and four stellarators, it is possible to draw limited conclusions whether Gyro- Bohm or Bohm scaling prevails. Either scaling may be favored, depending on whether corrections are included for possible {Beta} and v{sub *} corrections and whether all data are taken, or selected cases with low collisionality, or low net toroidal current, or with ECH heating applied, and so on. Monte Carlo-like simulations are used to test reliability of inferences about power-law scaling exponents made from data having substantial statistical variance and collinearity of control parameters. These show that for reliable conclusions, statistical studies should be augmented; more directed experimental studies are needed, with well controlled discharges and radially resolved data - such as those already begun on ATF and W7-AS.

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6 p.

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INIS; OSTI as DE96010644

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  • 9. International Atomic Energy Agency (IAEA) workshop on stellarators, Garching (Germany), 10-14 May 1993

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  • Other: DE96010644
  • Report No.: CONF-9305210--7
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 240480
  • Archival Resource Key: ark:/67531/metadc672805

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  • May 5, 1993

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 8 p.m.

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Dory, R.A.; Murakami, M. & Stroth, U. Distinguishing Gyro-Bohm and Bohm scaling in stellarators, article, May 5, 1993; Tennessee. (digital.library.unt.edu/ark:/67531/metadc672805/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.