Diagnosing hot electron production by short pulse, high intensity lasers using photonuclear reactions

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Solid targets irradiated with 10{sup 19} W/cm{sup 2} or greater of 1 {mu}m light in picosecond pulses are found to be radioactive. The strongest activities observed are the result of photonuclear reactions in which an energetic photon excites the nucleus sufficiently to produce particle emission leaving a radioactive daughter. The photoreaction cross sections are known for a wide range of nuclei and provide a quantitative measure of the photon flux produced in the target. Both the delayed daughter activities and measurements of the prompt particles emitted in the reaction can be used as diagnostics. Examples of these techniques applied in ... continued below

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Phillips, T. W., LLNL June 2, 1998.

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Solid targets irradiated with 10{sup 19} W/cm{sup 2} or greater of 1 {mu}m light in picosecond pulses are found to be radioactive. The strongest activities observed are the result of photonuclear reactions in which an energetic photon excites the nucleus sufficiently to produce particle emission leaving a radioactive daughter. The photoreaction cross sections are known for a wide range of nuclei and provide a quantitative measure of the photon flux produced in the target. Both the delayed daughter activities and measurements of the prompt particles emitted in the reaction can be used as diagnostics. Examples of these techniques applied in diagnosing experiments at the Nova laser facility adapted to generate petawatt pulses using chirped pulse amplification will be presented. These results will be compared with bremsstrahlung photon spectra calculated using electron spectra measured in a magnetic spectrograph. {copyright} {ital 1999 American Institute of Physics.}

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20 p.; Other: FDE: PDF; PL:

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INIS; OSTI as DE98058592

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  • 12. topical conference on high-temperature plasma diagnostics, Princeton, NJ (United States), 7-11 Jun 1998

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  • Other: DE98058592
  • Report No.: UCRL-JC--129813
  • Report No.: CONF-980605--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 302862
  • Archival Resource Key: ark:/67531/metadc688473

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  • June 2, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 16, 2016, 6:25 p.m.

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Phillips, T. W., LLNL. Diagnosing hot electron production by short pulse, high intensity lasers using photonuclear reactions, article, June 2, 1998; California. (digital.library.unt.edu/ark:/67531/metadc688473/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.