Impact of imposed mode 2 laser drive asymmetry on inertial confinement fusion implosions

Gatu Johnson, M.; Appelbe, B. D.; Chittenden, J. P.; Crilly, A.; Delettrez, J.; Forrest, C.; Frenje, J. A.; Glebov, V. Yu.; Grimble, W.; Haines, B. M.; Igumenshchev, I. V.; Janezic, R.; Knauer, J. P.; Lahmann, B.; Marshall, F. J.; Michel, T.; Séguin, F. H.; Stoeckl, C.; Walsh, C.; Zylstra, A. B.; Petrasso, R. D.

doi:10.1063/1.5066435

Title: Impact of imposed mode 2 laser drive asymmetry on inertial confinement fusion implosions

Journal Article · Mon Jan 14 00:00:00 EST 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5066435· OSTI ID:1895612

^[1]; Appelbe, B. D. ^[2]; Chittenden, J. P. ^[2]; Crilly, A. ^[2];

^[3]; Forrest, C. ^[3];

^[1]; Glebov, V. Yu. ^[3];

^[3];

^[4];

^[3]; Janezic, R. ^[3]; Knauer, J. P. ^[3];

^[1]; Marshall, F. J. ^[3];

^[3]; Séguin, F. H. ^[1]; Stoeckl, C. ^[3]; Walsh, C. ^[2];

^[4] more »

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Imperial College, London (United Kingdom)
Univ. of Rochester, NY (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Low-mode asymmetries have emerged as one of the primary challenges to achieving high-performing inertial confinement fusion implosions. These asymmetries seed flows in the implosions, which will manifest as modifications to the measured ion temperature (T_ion) as inferred from the broadening of primary neutron spectra. The effects are important to understand (i) to learn to control and mitigate low-mode asymmetries and (ii) to experimentally more closely capture thermal T_ion used as input in implosion performance metric calculations. Here, in this paper, results from and simulations of a set of experiments with a seeded mode 2 in the laser drive are described. The goal of this intentionally asymmetrically driven experiment was to test our capability to predict and measure the signatures of flows seeded by the low-mode asymmetry. The results from these experiments [first discussed in M. Gatu Johnson et al., Phys. Rev. E 98, 051201(R) (2018)] demonstrate the importance of interplay of flows seeded by various asymmetry seeds. In particular, measured T_ion and self-emission x-ray asymmetries are expected to be well captured by interplay between flows seeded by the imposed mode 2 and the capsule stalk mount. Measurements of areal density asymmetry also indicate the importance of the stalk mount as an asymmetry seed in these implosions. The simulations brought to bear on the problem (1D LILAC, 2D xRAGE, 3D ASTER, and 3D Chimera) show how thermal T_ion is expected to be significantly lower than T_ion as inferred from the broadening of measured neutron spectra. They also show that the electron temperature is not expected to be the same as T_ion for these implosions.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002949; NA0002726; AC52-06NA25396

OSTI ID:: 1895612

Journal Information:: Physics of Plasmas, Vol. 26, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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