Measurement of the3He Permeability of DT-Filled Fused Silica Inertial Confinement Fusion (ICF) Targets to Study the Effects of3He on Neutron Emission During Implosion
| Autor: | Stephen N. Paglieri, Thomas J. Venhaus, J. R. Langenbrunner, Hans W. Herrmann, Arthur Nobile, Hailey M. Murdock, Joseph M. Mack, Joseph R. Wermer |
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| Rok vydání: | 2008 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Neutron emission 020209 energy Mechanical Engineering Implosion 02 engineering and technology Partial pressure Laser 01 natural sciences 010305 fluids & plasmas law.invention Nuclear Energy and Engineering law Helium-3 0103 physical sciences 0202 electrical engineering electronic engineering information engineering General Materials Science Neutron Atomic physics Inertial confinement fusion Civil and Structural Engineering Laboratory for Laser Energetics |
| Zdroj: | Fusion Science and Technology. 54:569-575 |
| ISSN: | 1943-7641 1536-1055 |
| DOI: | 10.13182/fst08-a1880 |
| Popis: | A set of laser implosion experiments were conducted at the OMEGA laser at the University of Rochester, Laboratory for Laser Energetics (LLE) to study the effect of 3 He concentration in DT-filled target shells on fusion yield in ICF implosions.. Eleven laser fusion shells consisting of 1100-μm diameter, hollow, fused silica spheres with 4.6 to 4.7-μm-thick walls were loaded with 520 kPa of deuterium-tritium (DT) and then with 3 He (101.3 or 520 kPa). The 3 He permeabilities of the shells were determined by measuring the pressure rate of rise into a system with known volume. A mathematical method was developed that relied on the experimental fill pressure and time, and the rate of rise data to solve differential equations using MathCAD to simultaneously calculate 3 He permeability and initial 3 He partial pressure inside the shell. Because of the high permeation rate for 3 He out of the shells compared to that for DT gas, shells had to be recharged with 3 He immediately before being laser imploded or "shot" at LLE. The 3 He partial pressure in each individual shell at shot time was calculated from the measured 3 He permeability. Two different partial pressures of 3 He inside the shell were shown to reduce neutron and gamma yields during implosion. |
| Databáze: | OpenAIRE |
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