Variation of ignition requirements and. alpha. parameters with density profile shapes in a tokamak

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We study consequences of variations of the electron density profiles in a hypothetical tokamak that achieves a steady state DT neutron emission rate of 10{sup 20}/sec. The TRNASP plasma analysis code calculates heating profiles and parameters of the fast {alpha} particles. These include profiles of the {alpha} density, average energy, slowing down time, heating of electrons and ions, and {beta}{sub {alpha}}. The energy confinement time would have to be 2.7--3.1 times the L-mode scaling values for {alpha} heated ignition, with the lower ratios corresponding to the more peaked density profiles. The required energy transport coefficients are compared with those measured ... continued below

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Pages: (32 p)

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Budny, R.; McCune, D.; Zweben, S.J. (Princeton Univ., NJ (United States). Plasma Physics Lab.) & Sabbagh, S.A. (Columbia Univ., New York, NY (United States)) January 1, 1992.

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We study consequences of variations of the electron density profiles in a hypothetical tokamak that achieves a steady state DT neutron emission rate of 10{sup 20}/sec. The TRNASP plasma analysis code calculates heating profiles and parameters of the fast {alpha} particles. These include profiles of the {alpha} density, average energy, slowing down time, heating of electrons and ions, and {beta}{sub {alpha}}. The energy confinement time would have to be 2.7--3.1 times the L-mode scaling values for {alpha} heated ignition, with the lower ratios corresponding to the more peaked density profiles. The required energy transport coefficients are compared with those measured in the core of TFTR supershots. For NBI fueled ignition, we postulate 40 MW NBI injected at 110 keV. The profiles of the NBI fueling rates for D{sup +} and T{sup +} are greater than the DT burnup rates. The requirements for the ratio of the energy confinement times to the L-mode values are in the range of 2.0--2.5, again with the lower ratios corresponding to the more peaked density profiles. We discuss the ideal MHD stability of the simulations. The calculated {Beta}{sub norm} varies from 3.1--3.7, with the low values corresponding to the peaked profiles. We use the PEST code to analyze the low-n stability and the STABAL code to analyze the Mercier and high-n ballooning stability. The central q{sub MHD} for the simulations is low (<1), and they are unstable to the Mercier criterion, so we assume that sawteeth or current profile control would increase the values to near 1.0. Then the plasma with the most broad profile is stable if a conducting wall is placed 0.45 m outside the plasma boundary.

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Pages: (32 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • International Sherwood fusion theory conference, Santa Fe, NM (United States), 6-8 Apr 1992

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  • Other: DE92012673
  • Report No.: PPPL-CFP-2603
  • Report No.: CONF-920419--1
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 5361779
  • Archival Resource Key: ark:/67531/metadc1074480

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  • January 1, 1992

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 11, 2018, 6:32 p.m.

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Budny, R.; McCune, D.; Zweben, S.J. (Princeton Univ., NJ (United States). Plasma Physics Lab.) & Sabbagh, S.A. (Columbia Univ., New York, NY (United States)). Variation of ignition requirements and. alpha. parameters with density profile shapes in a tokamak, article, January 1, 1992; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1074480/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.