Electron temperature measurements of field-reversed configuration plasmas on the FRX-C/LSM experiment

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A single-point Thomson scattering diagnostic is used to determine the electron temperature T/sub e/ of field-reversed-configuration (FRC) compact toroids generated in the /theta/-pinch source of the Los Alamos FRX-C/LSM experiment. Measurements are performed close to the axial midplane and near the magnetic and geometric axes. A broad range of plasma conditions is investigated and electron temperatures vary, on average, between 90 and 190 eV. For a given condition, T/sub e/ remains relatively constant during the 60 /mu/s measurement interval between formation and the onset of the n = 2 rotational instability. T/sub e/ increases with plasma diameter and external magnetic ... continued below

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Pages: 46

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Rej, D.J. September 1, 1989.

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Description

A single-point Thomson scattering diagnostic is used to determine the electron temperature T/sub e/ of field-reversed-configuration (FRC) compact toroids generated in the /theta/-pinch source of the Los Alamos FRX-C/LSM experiment. Measurements are performed close to the axial midplane and near the magnetic and geometric axes. A broad range of plasma conditions is investigated and electron temperatures vary, on average, between 90 and 190 eV. For a given condition, T/sub e/ remains relatively constant during the 60 /mu/s measurement interval between formation and the onset of the n = 2 rotational instability. T/sub e/ increases with plasma diameter and external magnetic field, and decreases slightly with fill pressure. The temperature at the geometric axis is consistently 10--20% lower than that near the field null. The temperature is approximately 35% higher than observed previously on the smaller FRX-C device. The implications of these measurements on plasma confinement properties are discussed. 25 refs., 18 figs., 8 tabs.

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Pages: 46

Notes

NTIS, PC A03/MF A01 - OSTI; 1.

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  • Other Information: Portions of this document are illegible in microfiche products

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  • Other: DE89016187
  • Report No.: LA-11622-MS
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5866713 | External Link
  • Office of Scientific & Technical Information Report Number: 5866713
  • Archival Resource Key: ark:/67531/metadc1094870

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  • September 1, 1989

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 22, 2018, 1:42 p.m.

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Rej, D.J. Electron temperature measurements of field-reversed configuration plasmas on the FRX-C/LSM experiment, report, September 1, 1989; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1094870/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.