Bremsstrahlung pair-production of positrons with low neutron background.

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Minimization of component activation is highly desirable at accelerator-based positron sources. Electrons in the 8- to 14-MeV energy range impinging on a target produce photons energetic enough to create electron-positron pairs; however, few of the photons are energetic enough to produce photoneutrons. Slow positron production by low-energy electrons impinging on a multilayer tungsten target with and without electromagnetic extraction between the layers was studied by simulation. The neutron background from 14-MeV electrons is expected to be significantly lower than that encountered with higher-energy electron beams. Numerical results are presented and some ideas for a low-activation slow-positron source are discussed.

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5 p.

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Lessner, E. September 16, 1998.

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Minimization of component activation is highly desirable at accelerator-based positron sources. Electrons in the 8- to 14-MeV energy range impinging on a target produce photons energetic enough to create electron-positron pairs; however, few of the photons are energetic enough to produce photoneutrons. Slow positron production by low-energy electrons impinging on a multilayer tungsten target with and without electromagnetic extraction between the layers was studied by simulation. The neutron background from 14-MeV electrons is expected to be significantly lower than that encountered with higher-energy electron beams. Numerical results are presented and some ideas for a low-activation slow-positron source are discussed.

Physical Description

5 p.

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INIS; OSTI as DE00010766

Medium: P; Size: 5 pages

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  • 19th International Linac Accelerator Conference (Linac '98), Chicago, IL (US), 08/23/1998--08/28/1998

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  • Report No.: ANL/ASD/CP-96379
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10766
  • Archival Resource Key: ark:/67531/metadc621803

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Office of Scientific & Technical Information Technical Reports

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  • September 16, 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 11, 2017, 12:15 p.m.

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Lessner, E. Bremsstrahlung pair-production of positrons with low neutron background., article, September 16, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc621803/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.