Abstract
We report the first measurements of the fuel density-radius product ρR by secondary nuclear fusion reactions1,2 in deuterium fuel. If the fuel ρR is smaller than the range of the primary reaction products of T and 3He and the reaction time is much shorter than the hydrodynamic time scale, the number ratios of secondary to primary reactions are given by RDT/RDD = 0.09 ρR and RDHe/RDD = 0.14 ρR for spatially uniform duel. The advantage of the secondary reaction method compared with the knock-on method3,4 is its applicability to the near break-even compression. The advantage of the secondary reaction method compared with the neutron activation method6 is not a requirement of high-Z tracer gas, such as Br or Kr, which might degrade compression and heating of the fuel.
© 1986 Optical Society of America
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