Electron beam energy deposition and VUV efficiency measurements in rare gases

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Reliable techniques for the determination of the energy/cm$sup 3$ deposited by an e-beam into a gas as well as the energy/cm$sup 3$ radiated have been developed in order to obtain dependable data on the VUV fluorescence efficiency for rare gas excimers. Spatially resolved total stopping calorimetry in the gas at the cell foil was used to characterize the energy distribution in the e-beam (approximately 200 kV, few Amp/cm$sup 2$, approximately 1 $mu$sec) transmitted by a ''hibachi''-supported 1-mil Ti foil. By using these data, suitable input for a 3-D Monte Carlo electron transport code (SANDYL) was generated. The spatial distribution of ... continued below

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Pages: 25

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Turner, C.E. Jr.; Hoff, P.W. & Taska, J. November 1, 1975.

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Reliable techniques for the determination of the energy/cm$sup 3$ deposited by an e-beam into a gas as well as the energy/cm$sup 3$ radiated have been developed in order to obtain dependable data on the VUV fluorescence efficiency for rare gas excimers. Spatially resolved total stopping calorimetry in the gas at the cell foil was used to characterize the energy distribution in the e-beam (approximately 200 kV, few Amp/cm$sup 2$, approximately 1 $mu$sec) transmitted by a ''hibachi''-supported 1-mil Ti foil. By using these data, suitable input for a 3-D Monte Carlo electron transport code (SANDYL) was generated. The spatial distribution of energy deposition in the gas was then calculated taking into account multiple scattering and cell geometry. The validity of the SANDYL technique is substantiated by excellent agreement between the measured and calculated energy flux on a vertical stack of five fast risetime ( less than 1 msec) calorimeters at several depth positions [0 less than Z(cm) less than 15] in the gas [1 less than P(atm) less than 3]. Calibrated optical components were used in a well defined geometry that permitted calculation of the effective radiating volume observed. By using the above techniques, high absolute efficiencies (10--30 percent) have been measured for rare gas VUV continua emission which can photolytically produce group VI metastables [e.g., 0($sup 1$S), S($sup 1$S)] of interest as fusion visible-laser candidates.

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Pages: 25

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Dep. NTIS

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  • 1. international topical conference on electron beam research and technology, Albuquerque, New Mexico, USA, 3 Nov 1975

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  • Report No.: UCRL--77202
  • Report No.: CONF-751108--18
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4101962
  • Archival Resource Key: ark:/67531/metadc868708

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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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  • November 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 18, 2016, 1:52 p.m.

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Turner, C.E. Jr.; Hoff, P.W. & Taska, J. Electron beam energy deposition and VUV efficiency measurements in rare gases, article, November 1, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc868708/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.