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Measurement of hydrodynamic instability growth during the deceleration of an inertial confinement fusion implosion
High Energy Density Physics ( IF 1.192 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.hedp.2020.100817
L.A. Pickworth; V.A. Smalyuk; B.A. Hammel; C. Weber; D.S. Clark; H.F. Robey; A.G. MacPhee; S. Le Pape; D.T. Casey; L. Berzak-Hopkins; A. Zylstra; A. Kritcher; C.F. Walters; S.D. Bhandarkar; M. Stadermann; S. Johnson; S. Diaz; M. Ratledge; E. Hartouni

This paper presents an exploration of potential mitigation methods for the gas fuel fill tube in Inertial Confinement Fusion implosions (ICF) at the National Ignition Facility (NIF), and the impact of hydrodynamic growth seeded from other target imperfections using a specialized low convergence implosion experiment. Enhanced x-ray self- emission of this experiment design allows the impact of hydrodynamic growth through the deceleration phase of the implosion to be examined. Experiments comparing the perturbation visible during the implosion deceleration seeded by the fill tube by varying the initial geometry in otherwise similar implosions is presented. We further extend the experiment to explore the impact of isolated high atomic number dots of 5 and 20 µm diameter. These isolated dots are compared in two different ‘High Density Carbon’ ablator drives in an Au hohlraum. The experiment series finds a correlation to number of high frequency self-emission features observed in deceleration and degradation in total Deuterium-Deuterium neutron yield.
更新日期:2020-05-23

 

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