Impact of asymmetries on fuel performance in inertial confinement fusion

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

doi:10.1103/physreve.98.051201

Cited by 17 publications

(14 citation statements)

References 44 publications

(37 reference statements)

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“…In particular, interplay between the imposed mode 2 asymmetry in the laser drive and the intrinsic asymmetry seeded by the capsule stalk mount appears to describe the results well, as discussed in Ref. 26. In the present paper, the results from measurements and simulations of this asymmetry experiment are discussed in more detail, supporting the conclusion from Ref.…”

Section: Introductionsupporting

confidence: 86%

“…In the present paper, the results from measurements and simulations of this asymmetry experiment are discussed in more detail, supporting the conclusion from Ref. 26 and describing many additional more subtle insights not possible to convey in the limited letter format. This paper is organized as follows: Section II describes the experimental setup and main results; Sec.…”

Section: Introductionsupporting

confidence: 85%

“…As discussed in Ref. 26, Chimera quite closely reproduces the observed LOS asymmetry in T ion for Asym. A, where an average T ion enhancement of $0.4 keV is seen parallel to the imposed mode 2 relative to the symmetric shot (compare Table V and Fig.…”

Section: Articlesupporting

confidence: 75%

“…This hypothesis is also further supported by x-ray self-emission imaging results and qR asymmetry measurements, as discussed in Ref. 26 and further elaborated below. Obviously, a very interesting next step in fully confirming this hypothesis would again be 3D simulations including the imposed mode 2 and the stalk mount.…”

Section: Articlesupporting

confidence: 68%

“…As discussed in Ref. 26, this comparison combined with the geometry of the experiment, with the stalk at 37 from Asym. A and 71 from Asym.…”

Section: Articlementioning

confidence: 99%

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

et al. 2019

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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. 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.Published under license by AIP Publishing. https://doi.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 85%

Section: Articlesupporting

confidence: 75%

Section: Articlesupporting

confidence: 68%

“…As discussed in Ref. 26, this comparison combined with the geometry of the experiment, with the stalk at 37 from Asym. A and 71 from Asym.…”

Section: Articlementioning

confidence: 99%