Effective ionization coefficients, electron drift velocities, and limiting breakdown fields for gas mixtures of possible interest to particle detectors

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We have measured the gas-density, N, normalized effective ionization coefficient, {bar a}/N, and the electron drift velocity, w, as a function of the density-reduced electric field, E/N, and obtained the limiting, (E/N){sub lim}, value of E/N for the unitary gases Ar, CO{sub 2}, and CF{sub 4}, the binary gas mixtures CO{sub 2}:Ar (20: 80), CO{sub 2}:CH{sub 4} (20:80), and CF{sub 4}:Ar (20:80), and the ternary gas mixtures CO{sub 2}:CF{sub 4}:Ar (10:10:80) and H{sub 2}O: CF{sub 4}:Ar (2:18:80). Addition of the strongly electron thermalizing gas CO{sub 2} or H{sub 2}O to the binary mixture CF{sub 4}:Ar (1) cools'' the mixture (i.e., ... continued below

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Datskos, P.G. (Tennessee Univ., Knoxville, TN (United States). Dept. of Physics); Christophorou, L.G. & Carter, J.G. (Oak Ridge National Lab., TN (United States)) January 1, 1991.

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We have measured the gas-density, N, normalized effective ionization coefficient, {bar a}/N, and the electron drift velocity, w, as a function of the density-reduced electric field, E/N, and obtained the limiting, (E/N){sub lim}, value of E/N for the unitary gases Ar, CO{sub 2}, and CF{sub 4}, the binary gas mixtures CO{sub 2}:Ar (20: 80), CO{sub 2}:CH{sub 4} (20:80), and CF{sub 4}:Ar (20:80), and the ternary gas mixtures CO{sub 2}:CF{sub 4}:Ar (10:10:80) and H{sub 2}O: CF{sub 4}:Ar (2:18:80). Addition of the strongly electron thermalizing gas CO{sub 2} or H{sub 2}O to the binary mixture CF{sub 4}:Ar (1) cools'' the mixture (i.e., lowers the electron energies), (2) has only a small effect on the magnitude of w(E/N) in the E/N range employed in the particle detectors, and (3) increases {bar a}/N for E/N {ge} 50 {times} 10{sup {minus}17} V cm{sup 2}. The increase in {bar a}/N, even though the electron energies are lower in the ternary mixture, is due to the Penning ionization of CO{sub 2}(or H{sub 2}O) in collisions with excited Ar* atoms. The ternary mixtures -- being fast, cool, and efficient -- have potential for advanced gas-filled particle detectors such as those for the SCC muon chambers. 17 refs., 8 figs., 1 tab.

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Pages: (8 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Electrical insulation and dielectric phenomena conference, Knoxville, TN (United States), 20-24 Oct 1991

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  • Other: DE91015921
  • Report No.: CONF-911087-1
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5402014
  • Archival Resource Key: ark:/67531/metadc1074317

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  • January 1, 1991

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 2, 2018, 5:47 p.m.

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Datskos, P.G. (Tennessee Univ., Knoxville, TN (United States). Dept. of Physics); Christophorou, L.G. & Carter, J.G. (Oak Ridge National Lab., TN (United States)). Effective ionization coefficients, electron drift velocities, and limiting breakdown fields for gas mixtures of possible interest to particle detectors, article, January 1, 1991; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1074317/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.