TITLE

Diagnosing ignition with DT reaction history

AUTHOR(S)
Wilson, D. C.; Bradley, P. A.; Cerjan, C. J.; Salmonson, J. D.; Spears, B. K.; Hatchet, S. P.; Herrmann, H. W.; Glebov, V. Yu.
PUB. DATE
October 2008
SOURCE
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E525
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A full range DT reaction history of an ignition capsule, from 109 to 1020 neutrons/ns, offers the opportunity to diagnose fuel conditions hundreds of picoseconds before and during burn. The burn history begins with a sharp rise when the first shock reaches the center of the capsule. The level of this jump reflects the combined shock strength and the adiabat of DT fuel. Changes to the four laser pulses driving the capsule implosion which are large enough to degrade the yield make measurable changes to the reaction history. Low mode asymmetries grow during convergence but change the reaction history during the final ∼100 ps. High mode asymmetry or turbulence mixing affects only the reaction history within ∼50 ps of peak burn rate. A capsule with a tritium fuel layer containing a small amount of deuterium (∼1%) creates a reaction history similar to the ignition capsule, but without the final ignition burn. A combination of gas Cerenkov detectors and the neutron temporal diagnostic could be capable of diagnosing the full history of ignition and tritium rich capsules.
ACCESSION #
35150222

 

Related Articles

  • Heating of Deuterium Clusters by a Superatomic Ultra-Short Laser Pulse. Kraınov, V. P.; Smirnov, M. B. // Journal of Experimental & Theoretical Physics;Apr2001, Vol. 92 Issue 4, p626 

    The mechanisms of heating of the electronic component of large deuterium clusters by a superatomic ultra-short laser pulse field are considered. During pulse rise, the so-called “vacuum heating” plays the determining role. Electrons escaping from a cluster into the vacuum with a low...

  • Surface Heating of Deuterium Clusters by the Field of a Superintense Ultrashort Laser Pulse for Implementing the Nuclear Reaction d + d→[sup 3]He + n. Krainov, V. P.; Smirnov, M. B. // Physics of Atomic Nuclei;Apr2001, Vol. 64 Issue 4, p585 

    A new mechanism for heating the electron component of plasmas formed upon the application of a superintense ultrashort laser pulse to atomic clusters is proposed. Clusters considered here consist of deuterium atoms. Upon the emission of a large number of electrons, an irradiated cluster, which...

  • Picosecond optical sampling by semiconductor lasers. Ketterer, K.; Böttcher, E. H.; Bimberg, D. // Applied Physics Letters;5/25/1987, Vol. 50 Issue 21, p1471 

    It is shown that a semiconductor laser driven by short electrical current pulses represents a high-speed gate for external optical signals. Based on this finding a novel sampling technique for the detection of light pulses is demonstrated. Conventional semiconductor lasers can be used as...

  • High-Intensity Laser Pulse Interaction With Solids of Variable Density. Belyaev, V. S.; Matafonov, A. P.; Vinogradov, V. I.; Garanin, S. G.; Borisenko, N. G.; Chekmarev, A. M.; Demchenko, N. N.; Gromov, A. I.; Gus'kov, S. Yu.; Khalenkov, A. M.; Merkul'ev, Yu. A.; Rozanov, V. B.; Andrianov, V. P.; Ignat'ev, G. N.; Markushkin, Yu. E.; Pimenov, V. G. // AIP Conference Proceedings;2006, Vol. 849 Issue 1, p237 

    Experimental studies are presented on composition, density and structure influence onto the neutron yield resulting from deuterium-containing target interaction with laser light of 1018 W/cm2. Experimental data is compared with theoretical and simulation results. © 2006 American Institute of...

  • Multifilamentation of femtosecond laser pulses propagating in turbulent air near the ground. Spindler, G.; Paunescu, G. // Applied Physics B: Lasers & Optics;Jul2009, Vol. 96 Issue 1, p185 

    The propagation of femtosecond laser pulses in turbulent air near the ground is analyzed. Confining to a power regime distinctly above the critical power for self-focusing, i.e. P≈100 Pcr, and concentrating on initial peak intensities around 2.5×1011W/cm2, the onset and early evolution...

  • Multifilamentation of femtosecond laser pulses induced by small-scale air turbulence. Paunescu, G.; Spindler, G.; Riede, W.; Schröder, H.; Giesen, A. // Applied Physics B: Lasers & Optics;Jul2009, Vol. 96 Issue 1, p175 

    We report on experimental and numerical investigations of femtosecond pulse propagation locally disturbed by the turbulent flow field of a hot-air blower. The experiments show that turbulence may shorten the collapse/filamentation distance and induce the onset of multiple filaments. This is...

  • Novel laser flash technique to measure thermal effusivity of highly viscous liquids at high temperature. Ohta, Hiromichi; Shibata, Hiroyuki; Suzuki, Atsushi; Waseda, Yoshio // Review of Scientific Instruments;Mar2001, Vol. 72 Issue 3, p1899 

    A simple but useful experimental technique featuring a novel configuration for a sample cell, high-speed infrared detector and a heating pulse laser has been developed to obtain reliable thermal effusivity of a highly viscous liquid at high temperature. The sample is melted in a platinum...

  • A digital method for pulse-shape discrimination between neutrons and γ rays at a high counting rate and a low energy of detected radiation. Prokuronov, M.; Shabalin, A. // Instruments & Experimental Techniques;May2007, Vol. 50 Issue 3, p311 

    A digital method for pulse-shape discrimination between neutrons and γ rays was used in measurements at counting rates of up to ∼106 counts/s in the energy range of ∼2–800 keV. Pulses produced by neutrons and γ rays in a stilbene-based scintillation detector were digitized...

  • Use of AL307 light-emitting diodes as photodetectors for diagnostics of femtosecond light pulses. Baraulya, V. I.; Kobtsev, S. M.; Korablev, A. V. // Technical Physics Letters;Jan98, Vol. 24 Issue 1, p28 

    A nonlinear electrical response has been observed for the first time from AL307 light-emitting diodes exposed to femtosecond light pulses. When used in an unconventional fashion as unbiased photodiodes, these AL307 light-emitting diodes give an electrical response proportional to the square of...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics