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Title: Analysis of trends in experimental observables: Reconstruction of the implosion dynamics and implications for fusion yield extrapolation for direct-drive cryogenic targets on OMEGA

This paper describes a technique for identifying trends in performance degradation for inertial con finement fusion implosion experiments. It is based on reconstruction of the implosion core with a combination of low- and mid-mode asymmetries. This technique was applied to an ensemble of hydro-equivalent deuterium-tritium implosions on OMEGA that achieved inferred hot-spot pressures ≈56 ± 7 Gbar [S. Regan et al., Phys. Rev. Lett. 117, 025001 (2016)]. All the experimental observables pertaining to the core could be reconstructed simultaneously with the same combination of low and mid modes. This suggests that in addition to low modes, that can cause a degradation of the stagnation pressure, mid modes are present that reduce the size of the neutron and x-ray producing volume. The systematic analysis shows that asymmetries can cause an overestimation of the total areal density in these implosions. Finally, it is also found that an improvement in implosion symmetry resulting from correction of either the systematic mid or low modes would result in an increase of the hot-spot pressure from 56 Gbar to ≈ 80 Gbar and could produce a burning plasma when the implosion core is extrapolated to an equivalent 1.9 MJ symmetric direct illumination [A. Bose et al.,more » Phys. Rev. E 94, 011201(R) (2016)].« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ; ORCiD logo [2] ;  [2] ;  [2] ; ORCiD logo [2] ; ORCiD logo [2] ;  [4] ;  [4] ;  [4] ;  [4] ; ORCiD logo [5] ; ORCiD logo [5] ;  [4] ; ORCiD logo [4] ;  [4] ;  [4] ; ORCiD logo [4] ;  [4] more »;  [4] ;  [4] ; ORCiD logo [4] ;  [6] ; ORCiD logo [4] « less
  1. Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Rochester, NY (United States). Dept. of Physics and Astronomy and/or Mechanical Engineering
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Rochester, NY (United States). Dept. of Physics and Astronomy and/or Mechanical Engineering
  3. Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Rochester, NY (United States). Dept. of Physics and Astronomy and/or Mechanical Engineering
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  6. Ben Gurion Univ. of the Negev, Beer Sheva (Israel). Dept. of Mechanical Engineering
Publication Date:
Report Number(s):
2017-230; 1-407
Journal ID: ISSN 1070-664X; 2017-230, 1407, 2363
Grant/Contract Number:
NA0001944; FC02-04ER54789; B614207
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1456879
Alternate Identifier(s):
OSTI ID: 1439396