Thomson-scattering measurements of electron temperature and density in a plasma channel created by a relativistic electron beam

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The electron density (n/sub e/) and temperature (T/sub e/) of the plasma channel created by the propagation of a relativistic electron beam in air have been measured by a ruby laser Thomson scattering diagnostic. The measurements were made at the MIMI electron beam accelerator (1.6 MV, 21 kA, 70 ns) at various times during the plasma channel development, with 25 ns temporal resolution and 2 mm radial resolution. For example, in 5 Torr air, at the time of maximum electron beam current, the results are n/sub e/ = 1.86 x 10/sup 15/ cm/sup -3/ (+- 12%), T/sub e/ = 4.24 ... continued below

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Pages: 5

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Allen, G.R.; Parke Davis, H. & Brandenburg, J.E. January 1, 1983.

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Description

The electron density (n/sub e/) and temperature (T/sub e/) of the plasma channel created by the propagation of a relativistic electron beam in air have been measured by a ruby laser Thomson scattering diagnostic. The measurements were made at the MIMI electron beam accelerator (1.6 MV, 21 kA, 70 ns) at various times during the plasma channel development, with 25 ns temporal resolution and 2 mm radial resolution. For example, in 5 Torr air, at the time of maximum electron beam current, the results are n/sub e/ = 1.86 x 10/sup 15/ cm/sup -3/ (+- 12%), T/sub e/ = 4.24 eV (+- 20%). These results, as well as those with other timing, are in good agreement with the theoretical results of the Air Propagation Code: n/sub e/ = 1.65 x 10/sup 15/ cm/sup -3/, T/sub e/ = 2.59 eV. Signal-to-noise is very good (10:1), limited by x-ray fluorescence of the fiber optics at the spectrometer. In fielding the diagnostic on higher energy accelerators, however, the dominant noise is expected to be the background light from the plasma and hot gas, or the fluorescence of the collecting optics. Improvements to the diagnostic and an ongoing experiment in 80 Torr of air, 4 MV, 50 kA to address these issues is presented.

Physical Description

Pages: 5

Notes

NTIS, PC A02/MF A01; 1.

Source

  • 5. international conference on high power particle beams, San Francisco, CA, USA, 12 Sep 1983

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  • Other: DE84000356
  • Report No.: SAND-83-0590C
  • Report No.: CONF-830911-20
  • Grant Number: AC04-76DP00789
  • DOI: 10.2172/5778684 | External Link
  • Office of Scientific & Technical Information Report Number: 5778684
  • Archival Resource Key: ark:/67531/metadc1095196

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 1, 1983

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 18, 2018, 4:23 p.m.

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Allen, G.R.; Parke Davis, H. & Brandenburg, J.E. Thomson-scattering measurements of electron temperature and density in a plasma channel created by a relativistic electron beam, report, January 1, 1983; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc1095196/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.