Electron temperature measurements of FRX-C/LSM

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The electron temperature T/sub e/ has been measured with Thomson scattering field-reversed configurations (FRCs) on the Los Alamos FRX-C/LSM experiment. FRCs formed and trapped in-situ in the theta-pinch source are studied. These experiments mark the first comprehensive FRC T/sub e/ measurements in over five years with data gathered on over 400 discharges. Measurements are performed at a single point in space and time on each discharge. The Thomson scattering diagnostic consist of a Q-switched ruby laser focused from one end to a point 0.2 m from the axial midplane of the theta-pinch coil and at radius of either 0.00 or ... continued below

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Pages: 5

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Rej, D.J. January 1, 1989.

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The electron temperature T/sub e/ has been measured with Thomson scattering field-reversed configurations (FRCs) on the Los Alamos FRX-C/LSM experiment. FRCs formed and trapped in-situ in the theta-pinch source are studied. These experiments mark the first comprehensive FRC T/sub e/ measurements in over five years with data gathered on over 400 discharges. Measurements are performed at a single point in space and time on each discharge. The Thomson scattering diagnostic consist of a Q-switched ruby laser focused from one end to a point 0.2 m from the axial midplane of the theta-pinch coil and at radius of either 0.00 or 0.10 m. Scattered light is collected, dispersed and detected with a 7-channel, triple-grating polychromator configured to detect light wavelengths between 658 and 692 nm. Photomultiplier currents are measured with gated A/D converters, with plasma background signals recorded 100-ns before and 100-ns after the laser pulse. Electron temperatures are measured at either radial position during the time interval, 10 less than or equal to t less than or equal to 70 ..mu..s, between FRC formation and the onset of the n = 2 instability which usually terminates the discharge. A variety of plasma conditions have been produced by adjusting three external parameters: the initial deuterium fill pressure p/sub O/; the reversed bias magnetic field B/sub b/; and the external magnetic field B/sub w/. The fill-pressure scan has been performed at B/sub b/ approx. = 60 mT and B/sub w/ approx. = 0.4 T with p/sub o/ set at either 2, 3, 4 or 5 mtorr. The bias-field scan, 37 less than or equal to B/sub b/ less than or equal to 95 mT, has been performed at p/sub o/ = 3 mtorr and B/sub w/ approx. = 0.4 T. 7 refs., 3 figs., 3 tabs.

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Pages: 5

Notes

NTIS, PC A02/MF A01 - OSTI; 1.

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  • 9. U.S. compact toroid symposium, Union, WA, USA, 14 Mar 1989

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  • Other: DE89009359
  • Report No.: LA-UR-89-870
  • Report No.: CONF-8903100-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6211850
  • Archival Resource Key: ark:/67531/metadc1110493

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  • January 1, 1989

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • May 22, 2018, 1:43 p.m.

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Rej, D.J. Electron temperature measurements of FRX-C/LSM, article, January 1, 1989; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1110493/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.