Transient Transport Experiments in the CDX-U Spherical Torus

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Electron transport has been measured in the Current Drive Experiment-Upgrade (CDX-U) using two separate perturbative techniques. Gas modulation at the plasma edge was used to introduce cold-pulses which propagate towards the plasma center, providing time-of-flight information leading to a determination of chi(subscript e) as a function of radius. Sawteeth at the q=1 radius (r/a {approx} 0.15) induced heat-pulses which propagated outward towards the plasma edge, providing a complementary time-of-flight based chi(subscript e) profile measurement. This work represents the first localized measurement of chi(subscript e) in a spherical torus. It is found that chi(subscript e) = 1-2 meters squared per second ... continued below

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654 Kilobytes pages

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Munsat, T.; Efthimion, P.C.; Jones, B.; Kaita, R.; Majeski, R.; Stutman, D. et al. June 12, 2001.

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Description

Electron transport has been measured in the Current Drive Experiment-Upgrade (CDX-U) using two separate perturbative techniques. Gas modulation at the plasma edge was used to introduce cold-pulses which propagate towards the plasma center, providing time-of-flight information leading to a determination of chi(subscript e) as a function of radius. Sawteeth at the q=1 radius (r/a {approx} 0.15) induced heat-pulses which propagated outward towards the plasma edge, providing a complementary time-of-flight based chi(subscript e) profile measurement. This work represents the first localized measurement of chi(subscript e) in a spherical torus. It is found that chi(subscript e) = 1-2 meters squared per second in the plasma core (r/a < 1/3), increasing by an order of magnitude or more outside of this region. Furthermore, the chi(subscript e) profile exhibits a sharp transition near r/a = 1/3. Spectral and profile analyses of the soft X-rays, scanning interferometer, and edge probe data show no evidence of a significant magnetic island causing the high chi(subscript e) region.

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654 Kilobytes pages

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INIS; OSTI as DE00786537

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  • Other Information: PBD: 12 Jun 2001

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  • Report No.: PPPL-3574
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/786537 | External Link
  • Office of Scientific & Technical Information Report Number: 786537
  • Archival Resource Key: ark:/67531/metadc722258

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  • June 12, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 9:56 p.m.

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Munsat, T.; Efthimion, P.C.; Jones, B.; Kaita, R.; Majeski, R.; Stutman, D. et al. Transient Transport Experiments in the CDX-U Spherical Torus, report, June 12, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc722258/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.