Nondimensional transport experiments on DIII-D and projections to an ignition tokamak

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Description

The concept of nondimensional scaling of transport makes it possible to determine the required size for an ignition device based upon data from a single machine and illuminates the underlying physics of anomalous transport. The scaling of cross-field heat transport with the relative gyroradius {rho}*, the gyroradius normalized to the plasma minor radius, is of particular interest since {rho}* is the only nondimensional parameter which will vary significantly between present day machines and an ignition device. These nondimensional scaling experiments are based upon theoretical considerations which indicate that the thermal heat diffusivity can be written in the form {chi} = ... continued below

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7 p.

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Petty, C.C.; Luce, T.C.; Balet, B.; Christiansen, J.P. & Cordey, J.G. July 1, 1996.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

The concept of nondimensional scaling of transport makes it possible to determine the required size for an ignition device based upon data from a single machine and illuminates the underlying physics of anomalous transport. The scaling of cross-field heat transport with the relative gyroradius {rho}*, the gyroradius normalized to the plasma minor radius, is of particular interest since {rho}* is the only nondimensional parameter which will vary significantly between present day machines and an ignition device. These nondimensional scaling experiments are based upon theoretical considerations which indicate that the thermal heat diffusivity can be written in the form {chi} = {chi}{sub B}{rho}*{sup x{sub {rho}}} F({beta}, v*, q, R/a, {kappa}, T{sub e}/T{sub i},...), where {chi}{sub B} = cT/eB. As explained elsewhere, x{sub {rho}} = 1 is called gyro-Bohm scaling, x{sub {rho}} is Bohm scaling, x{sub {rho}} = {minus}1/2 is Goldston scaling, and x{sub {rho}} = {minus}1 is stochastic scaling. The DIII-D results reported in this paper cover three important aspects of nondimensional scaling experiments: the testing of the underlying assumption of the nondimensional scaling approach, the determination of the {rho}* scaling of heat transport for various plasma regimes, and the extrapolation of the energy confinement time to future ignition devices.

Physical Description

7 p.

Notes

INIS; OSTI as DE97001824

Source

  • 23. European Physical Society conference on controlled fusion and plasma physics, Kiev (Ukraine), 24-28 Jun 1996

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  • Other: DE97001824
  • Report No.: GA-A--22385
  • Report No.: CONF-9606226--7
  • Grant Number: AC03-89ER51114
  • DOI: 10.2172/425349 | External Link
  • Office of Scientific & Technical Information Report Number: 425349
  • Archival Resource Key: ark:/67531/metadc684856

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  • July 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • April 18, 2016, 5:52 p.m.

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Petty, C.C.; Luce, T.C.; Balet, B.; Christiansen, J.P. & Cordey, J.G. Nondimensional transport experiments on DIII-D and projections to an ignition tokamak, report, July 1, 1996; San Diego, California. (https://digital.library.unt.edu/ark:/67531/metadc684856/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.