High intensity positron program at LLNL

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Lawrence Livermore National Laboratory (LLNL) is the home of the world's highest current beam of keV positrons. The potential for establishing a national center for materials analysis using positron annihilation techniques around this capability is being actively pursued. The high LLNL beam current will enable investigations in several new areas. We are developing a positron microprobe that will produce a pulsed, focused positron beam for 3-dimensional scans of defect size and concentration with submicron resolution. Below we summarize the important design features of this microprobe. Several experimental end stations will be available that can utilize the high current beam with ... continued below

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216 Kilobytes pages

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Asoka-Kumar, P.; Howell, R.H. & Stoeffl, W. September 23, 1998.

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Description

Lawrence Livermore National Laboratory (LLNL) is the home of the world's highest current beam of keV positrons. The potential for establishing a national center for materials analysis using positron annihilation techniques around this capability is being actively pursued. The high LLNL beam current will enable investigations in several new areas. We are developing a positron microprobe that will produce a pulsed, focused positron beam for 3-dimensional scans of defect size and concentration with submicron resolution. Below we summarize the important design features of this microprobe. Several experimental end stations will be available that can utilize the high current beam with a time distribution determined by the electron linac pulse structure, quasi-continuous, or bunched at 20 MHz, and can operate in an electrostatic or (and) magnetostatic environment. Some of the planned early experiments are: two-dimensional angular correlation of annihilation radiation of thin films and buried interfaces, positron diffraction holography, positron induced desorption, and positron induced Auger spectra.

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216 Kilobytes pages

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  • Conference on Applications of Accelerators in Research and Industry, Denton, TX (US), 11/04/1998--11/07/1998

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  • Report No.: UCRL-JC-132024
  • Report No.: DP0401281
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 2788
  • Archival Resource Key: ark:/67531/metadc667513

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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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  • September 23, 1998

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  • June 29, 2015, 9:42 p.m.

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  • May 6, 2016, 1:26 p.m.

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Asoka-Kumar, P.; Howell, R.H. & Stoeffl, W. High intensity positron program at LLNL, article, September 23, 1998; California. (digital.library.unt.edu/ark:/67531/metadc667513/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.