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

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 meas… more
Date: September 14, 2007
Creator: Miller, Edward K.; Hermann, H. W.; Caldwell, S. E.; Evans, S. C.; Mack, J. M.; Shanch, P. et al.
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Partner: UNT Libraries Government Documents Department
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Gamma Reaction History for the NIF

Description: Bang time and reaction history measurements are fundamental components of diagnosing ICF implosions and will be essential contributors to diagnosing attempts at ignition on the National Ignition Facility (NIF). Fusion gammas provide a direct measure of fusion interaction rate without being compromised by Doppler spreading. Gamma-based gas Cherenkov detectors that convert fusion gamma rays to optical Cherenkov photons for collection by fast recording systems have been developed and fielded at Om… more
Date: June 5, 2009
Creator: Herrmann, H. W.; Evans, S. C.; Kim, Y.; Mack, J. M.; Young, C. S.; Cox, B. C. et al.
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Partner: UNT Libraries Government Documents Department
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