Measurements of optically thin electron cyclotron emission from relativistic electrons

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Electron cyclotron emission (ECE) from hot, relativistic electrons has been measured simulataneously at several optically thin frequencies (f/f/sub ce/ = 4.6, 7.0, and 9.6) on the Tandem Mirror Experiment-Upgrade. A method to determine the temporal evolution of the hot electron density, n/sub h/, and temperature T/sub h/ is discussed. Calculations of T/sub h/ agree with the analysis of the high energy x-ray spectra. Heating rates vary between 3 keV/ms and 13 keV/ms and temperatures over 300 keV have been reached by the end of the 50 ms discharge. The ECE analysis provides an order of magnitude improvement in time resolution ... continued below

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Pages: 14

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James, R.A.; Silver, E.; Boyd, D.; Ellis, R.F.; Jantz, S.; Lasnier, C.J. et al. October 1, 1987.

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Electron cyclotron emission (ECE) from hot, relativistic electrons has been measured simulataneously at several optically thin frequencies (f/f/sub ce/ = 4.6, 7.0, and 9.6) on the Tandem Mirror Experiment-Upgrade. A method to determine the temporal evolution of the hot electron density, n/sub h/, and temperature T/sub h/ is discussed. Calculations of T/sub h/ agree with the analysis of the high energy x-ray spectra. Heating rates vary between 3 keV/ms and 13 keV/ms and temperatures over 300 keV have been reached by the end of the 50 ms discharge. The ECE analysis provides an order of magnitude improvement in time resolution over the x-ray analysis and shows that fast reductions in the diamagnetic loop signals are predominantly a loss of perpendicular energy stored by the mirror trapped hot electrons. These techniques for determining n/sub h/(t) and T/sub t/(t) will be used on the DIII-D tokamak in order to parameterize the nonthermal electron tail produced during ECH current drive experiments. A vertical view will be utilized and a fast (70 Hz) scanning Michelson interferometer will be used to measure the ECE spectrum between the 2nd and the 15th harmonic. 11 refs., 7 figs.

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Pages: 14

Notes

NTIS, PC A03/MF A01; 1.

Source

  • Joint workshop on electron cyclotron emission and the electron cyclotron resonance heating, Oxford, UK, 16 Sep 1987

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  • Other: DE88004713
  • Report No.: UCRL-97839
  • Report No.: CONF-8709157-2
  • Report No.: GA-A-18980
  • Grant Number: AC03-84ER51044
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5706786
  • Archival Resource Key: ark:/67531/metadc1093275

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  • October 1, 1987

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  • Feb. 10, 2018, 10:06 p.m.

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  • March 20, 2018, 5:54 p.m.

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James, R.A.; Silver, E.; Boyd, D.; Ellis, R.F.; Jantz, S.; Lasnier, C.J. et al. Measurements of optically thin electron cyclotron emission from relativistic electrons, article, October 1, 1987; United States. (digital.library.unt.edu/ark:/67531/metadc1093275/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.