In-flight observations of low-mode ρ R asymmetries in NIF implosions

A. B. Zylstra; J. A. Frenje; F. H. Séguin; J. R. Rygg; A. Kritcher; M. J. Rosenberg; H. G. Rinderknecht; D. G. Hicks; S. Friedrich; R. Bionta; N. B. Meezan; R. Olson; J. Atherton; M. Barrios; P. Bell; R. Benedetti; L. Berzak Hopkins; R. Betti; D. Bradley; D. Callahan; D. Casey; G. Collins; E. L. Dewald; S. Dixit; T. Döppner; M. J. Edwards; M. Gatu Johnson; S. Glenn; G. Grim; S. Hatchett; O. Jones; S. Khan; J. Kilkenny; J. Kline; J. Knauer; G. Kyrala; O. Landen; S. Lepape; C. K. Li; J. Lindl; T. Ma; A. Mackinnon; M. J.E. Manuel; D. Meyerhofer; E. Moses; S. R. Nagel; A. Nikroo; T. Parham; A. Pak; R. D. Petrasso; R. Prasad; J. Ralph; H. F. Robey; J. S. Ross; T. C. Sangster; S. Sepke; N. Sinenian; H. W. Sio; B. Spears; R. Tommasini; R. Town; S. Weber; D. Wilson; C. Yeamans; R. Zacharias

doi:10.1063/1.4918355

In-flight observations of low-mode ρ R asymmetries in NIF implosions

A. B. Zylstra, J. A. Frenje, F. H. Séguin, J. R. Rygg, A. Kritcher, M. J. Rosenberg, H. G. Rinderknecht, D. G. Hicks, S. Friedrich, R. Bionta, N. B. Meezan, R. Olson, J. Atherton, M. Barrios, P. Bell, R. Benedetti, L. Berzak Hopkins, R. Betti, D. Bradley, D. CallahanD. Casey, G. Collins, E. L. Dewald, S. Dixit, T. Döppner, M. J. Edwards, M. Gatu Johnson, S. Glenn, G. Grim, S. Hatchett, O. Jones, S. Khan, J. Kilkenny, J. Kline, J. Knauer, G. Kyrala, O. Landen, S. Lepape, C. K. Li, J. Lindl, T. Ma, A. Mackinnon, M. J.E. Manuel, D. Meyerhofer, E. Moses, S. R. Nagel, A. Nikroo, T. Parham, A. Pak, R. D. Petrasso, R. Prasad, J. Ralph, H. F. Robey, J. S. Ross, T. C. Sangster, S. Sepke, N. Sinenian, H. W. Sio, B. Spears, R. Tommasini, R. Town, S. Weber, D. Wilson, C. Yeamans, R. Zacharias

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Abstract

Charged-particle spectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D³He gas-filled implosions at the National Ignition Facility produce energetic protons via D+³He fusion that are used to measure the implosion areal density (ρR) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3-5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, proton spectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely ≳ 10 %, which are interpreted as ℓ = 2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained ("no-coast"), implying a significant time-dependent asymmetry in peak drive.

Original language	English (US)
Article number	056301
Journal	Physics of Plasmas
Volume	22
Issue number	5
DOIs	https://doi.org/10.1063/1.4918355
State	Published - May 1 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4918355

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Zylstra, A. B., Frenje, J. A., Séguin, F. H., Rygg, J. R., Kritcher, A., Rosenberg, M. J., Rinderknecht, H. G., Hicks, D. G., Friedrich, S., Bionta, R., Meezan, N. B., Olson, R., Atherton, J., Barrios, M., Bell, P., Benedetti, R., Berzak Hopkins, L., Betti, R., Bradley, D., ... Zacharias, R. (2015). In-flight observations of low-mode ρ R asymmetries in NIF implosions. Physics of Plasmas, 22(5), Article 056301. https://doi.org/10.1063/1.4918355

@article{b7d333d1f2704a9ea44ff12cc1b4c0f9,

title = "In-flight observations of low-mode ρ R asymmetries in NIF implosions",

abstract = "Charged-particle spectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D3He gas-filled implosions at the National Ignition Facility produce energetic protons via D+3He fusion that are used to measure the implosion areal density (ρR) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3-5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, proton spectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely ≳ 10 \%, which are interpreted as ℓ = 2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained ({"}no-coast{"}), implying a significant time-dependent asymmetry in peak drive.",

author = "Zylstra, \{A. B.\} and Frenje, \{J. A.\} and S{\'e}guin, \{F. H.\} and Rygg, \{J. R.\} and A. Kritcher and Rosenberg, \{M. J.\} and Rinderknecht, \{H. G.\} and Hicks, \{D. G.\} and S. Friedrich and R. Bionta and Meezan, \{N. B.\} and R. Olson and J. Atherton and M. Barrios and P. Bell and R. Benedetti and \{Berzak Hopkins\}, L. and R. Betti and D. Bradley and D. Callahan and D. Casey and G. Collins and Dewald, \{E. L.\} and S. Dixit and T. D{\"o}ppner and Edwards, \{M. J.\} and \{Gatu Johnson\}, M. and S. Glenn and G. Grim and S. Hatchett and O. Jones and S. Khan and J. Kilkenny and J. Kline and J. Knauer and G. Kyrala and O. Landen and S. Lepape and Li, \{C. K.\} and J. Lindl and T. Ma and A. Mackinnon and Manuel, \{M. J.E.\} and D. Meyerhofer and E. Moses and Nagel, \{S. R.\} and A. Nikroo and T. Parham and A. Pak and Petrasso, \{R. D.\} and R. Prasad and J. Ralph and Robey, \{H. F.\} and Ross, \{J. S.\} and Sangster, \{T. C.\} and S. Sepke and N. Sinenian and Sio, \{H. W.\} and B. Spears and R. Tommasini and R. Town and S. Weber and D. Wilson and C. Yeamans and R. Zacharias",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = may,

day = "1",

doi = "10.1063/1.4918355",

language = "English (US)",

volume = "22",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

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Zylstra, AB, Frenje, JA, Séguin, FH, Rygg, JR, Kritcher, A, Rosenberg, MJ, Rinderknecht, HG, Hicks, DG, Friedrich, S, Bionta, R, Meezan, NB, Olson, R, Atherton, J, Barrios, M, Bell, P, Benedetti, R, Berzak Hopkins, L, Betti, R, Bradley, D, Callahan, D, Casey, D, Collins, G, Dewald, EL, Dixit, S, Döppner, T, Edwards, MJ, Gatu Johnson, M, Glenn, S, Grim, G, Hatchett, S, Jones, O, Khan, S, Kilkenny, J, Kline, J, Knauer, J, Kyrala, G, Landen, O, Lepape, S, Li, CK, Lindl, J, Ma, T, Mackinnon, A, Manuel, MJE, Meyerhofer, D, Moses, E, Nagel, SR, Nikroo, A, Parham, T, Pak, A, Petrasso, RD, Prasad, R, Ralph, J, Robey, HF, Ross, JS, Sangster, TC, Sepke, S, Sinenian, N, Sio, HW, Spears, B, Tommasini, R, Town, R, Weber, S, Wilson, D, Yeamans, C & Zacharias, R 2015, 'In-flight observations of low-mode ρ R asymmetries in NIF implosions', Physics of Plasmas, vol. 22, no. 5, 056301. https://doi.org/10.1063/1.4918355

TY - JOUR

T1 - In-flight observations of low-mode ρ R asymmetries in NIF implosions

AU - Zylstra, A. B.

AU - Frenje, J. A.

AU - Séguin, F. H.

AU - Rygg, J. R.

AU - Kritcher, A.

AU - Rosenberg, M. J.

AU - Rinderknecht, H. G.

AU - Hicks, D. G.

AU - Friedrich, S.

AU - Bionta, R.

AU - Meezan, N. B.

AU - Olson, R.

AU - Atherton, J.

AU - Barrios, M.

AU - Bell, P.

AU - Benedetti, R.

AU - Berzak Hopkins, L.

AU - Betti, R.

AU - Bradley, D.

AU - Callahan, D.

AU - Casey, D.

AU - Collins, G.

AU - Dewald, E. L.

AU - Dixit, S.

AU - Döppner, T.

AU - Edwards, M. J.

AU - Gatu Johnson, M.

AU - Glenn, S.

AU - Grim, G.

AU - Hatchett, S.

AU - Jones, O.

AU - Khan, S.

AU - Kilkenny, J.

AU - Kline, J.

AU - Knauer, J.

AU - Kyrala, G.

AU - Landen, O.

AU - Lepape, S.

AU - Li, C. K.

AU - Lindl, J.

AU - Ma, T.

AU - Mackinnon, A.

AU - Manuel, M. J.E.

AU - Meyerhofer, D.

AU - Moses, E.

AU - Nagel, S. R.

AU - Nikroo, A.

AU - Parham, T.

AU - Pak, A.

AU - Petrasso, R. D.

AU - Prasad, R.

AU - Ralph, J.

AU - Robey, H. F.

AU - Ross, J. S.

AU - Sangster, T. C.

AU - Sepke, S.

AU - Sinenian, N.

AU - Sio, H. W.

AU - Spears, B.

AU - Tommasini, R.

AU - Town, R.

AU - Weber, S.

AU - Wilson, D.

AU - Yeamans, C.

AU - Zacharias, R.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - Charged-particle spectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D3He gas-filled implosions at the National Ignition Facility produce energetic protons via D+3He fusion that are used to measure the implosion areal density (ρR) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3-5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, proton spectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely ≳ 10 %, which are interpreted as ℓ = 2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained ("no-coast"), implying a significant time-dependent asymmetry in peak drive.

AB - Charged-particle spectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D3He gas-filled implosions at the National Ignition Facility produce energetic protons via D+3He fusion that are used to measure the implosion areal density (ρR) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3-5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, proton spectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely ≳ 10 %, which are interpreted as ℓ = 2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained ("no-coast"), implying a significant time-dependent asymmetry in peak drive.

UR - https://www.scopus.com/pages/publications/84928473917

UR - https://www.scopus.com/inward/citedby.url?scp=84928473917&partnerID=8YFLogxK

U2 - 10.1063/1.4918355

DO - 10.1063/1.4918355

M3 - Article

AN - SCOPUS:84928473917

SN - 1070-664X

VL - 22

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056301

ER -

In-flight observations of low-mode ρ R asymmetries in NIF implosions

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