Improved Gamma Bang Time Measurements on Omega and Implications for the National Ignition Facility

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The time of peak fusion reactivity with respect to the impingement of laser light on an ICF capsule is known as Bang Time (BT). This is an essential parameter in the understanding of ICF implosions. Traditionally, BT has been determined through temporal measurements of 14 MeV fusion neutrons. Because the neutron energy spectrum is Doppler broadened, the detector must be positioned close to target-chamber center in order to minimize the neutron temporal spreading which can compromise such a measurement. Fusion gammas, on the other hand, are not subject to temporal spreading, making proximity of the detector to the source a ... continued below

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Edward K. Miller (NSTec), H. W. Hermann, S. E. Caldwell, S. C. Evans, J. M. Mack, P. Shanch, T. Sedillo, C. S. Young (LANL); C. J. Holrsfield, D. Drew (Atomic Weapons Establishment) & Rochester), V. Yu Glebov (University of September 14, 2007.

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Description

The time of peak fusion reactivity with respect to the impingement of laser light on an ICF capsule is known as Bang Time (BT). This is an essential parameter in the understanding of ICF implosions. Traditionally, BT has been determined through temporal measurements of 14 MeV fusion neutrons. Because the neutron energy spectrum is Doppler broadened, the detector must be positioned close to target-chamber center in order to minimize the neutron temporal spreading which can compromise such a measurement. Fusion gammas, on the other hand, are not subject to temporal spreading, making proximity of the detector to the source a lesser concern. However, the low branching ratio for DT fusion reactions producing gammas ({approx}1e-4) presents detector sensitivity challenges.

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  • Fifth International Conference on Inertial Fusion Sciences and Affplication, 09/09-09/14/2007

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  • Report No.: DOE/NV/25946--194
  • Grant Number: DE-AC52-06NA25946
  • Office of Scientific & Technical Information Report Number: 915224
  • Archival Resource Key: ark:/67531/metadc886931

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Office of Scientific & Technical Information Technical Reports

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  • September 14, 2007

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  • Sept. 22, 2016, 2:13 a.m.

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Edward K. Miller (NSTec), H. W. Hermann, S. E. Caldwell, S. C. Evans, J. M. Mack, P. Shanch, T. Sedillo, C. S. Young (LANL); C. J. Holrsfield, D. Drew (Atomic Weapons Establishment) & Rochester), V. Yu Glebov (University of. Improved Gamma Bang Time Measurements on Omega and Implications for the National Ignition Facility, article, September 14, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc886931/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.