Application of cross-beam energy transfer to control drive symmetry in ICF implosions in low gas fill Hohlraums at the National Ignition Facility

被引：24

作者：

Pickworth, L. A. ^{[1
]}

Doeppner, T. ^{[1
]}

Hinkel, D. E. ^{[1
]}

Ralph, J. E. ^{[1
]}

Bachmann, B. ^{[1
]}

Masse, L. P. ^{[1
]}

Divol, L. ^{[1
]}

Benedetti, L. R. ^{[1
]}

Celliers, P. M. ^{[1
]}

Chen, H. ^{[1
]}

Hohenberger, M. ^{[1
]}

Khan, S. F. ^{[1
]}

Landen, O. L. ^{[1
]}

Lemos, N. ^{[1
]}

MacGowan, B. J. ^{[1
]}

Mariscal, D. A. ^{[1
]}

Michel, P. A. ^{[1
]}

Millot, M. ^{[1
]}

Moore, A. S. ^{[1
]}

Park, J. ^{[1
]}

Schneider, M. B. ^{[1
]}

Callahan, D. A. ^{[1
]}

Hurricane, O. A. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICS OF PLASMAS | 2020年 / 27卷 / 10期

关键词：

FUSION;

D O I：

10.1063/5.0004866

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Cross beam energy transfer (CBET), invoked by setting a wavelength difference, Delta lambda, between inner and outer beam cones, can be used to increase the drive on the waist in indirectly driven inertial confinement fusion experiments at the National Ignition Facility (NIF). Historically, hot spot symmetry control in capsule implosions in high (>= 0.9mg/cm(3 4)He) gas fill Hohlraums was enabled by substantial CBET. However, these implosion designs suffered from inflight symmetry swings, high SRS backscatter on the inner cones, and significant hot electron generation posing a threat to DT fuel preheat. Subsequent experiments in larger, low (<= 0.6mg/cm(3 4)He) gas fill Hohlraums demonstrated round implosions by varying the inner cone fraction throughout the laser drive at Delta lambda=0 angstrom while keeping backscatter and hot electron generation very low. To enable driving larger capsules at a given Hohlraum size, additional tools for implosion symmetry control are required. With this goal in mind, this paper presents a detailed experimental study of using CBET in low gas fill Hohlraums near NIF's current peak power capability. We find a similar to 2.5x higher sensitivity of the P-2 Legendre mode with respect to Delta lambda changes compared to that of high gas fill designs. We attribute this observation to the fact that backscatter remains very low and that CBET remains in a linear regime, as suggested by simulations. As a result, a much smaller Delta lambda of order 1 angstrom is sufficient for sustaining implosion symmetry while keeping laser-to-Hohlraum coupling high and hot electron generation very low. While this study used plastic ablator capsules, our findings can be generalized to other ablator materials and, hence, show great promise for using wavelength detuning as a strong lever for implosion symmetry control in future low gas fill designs that require smaller case to capsule ratios in order to increase the energy coupled to the capsule.

引用

页数：13

共 15 条

[1] Isolating and quantifying cross-beam energy transfer in direct-drive implosions on OMEGA and the National Ignition Facility
Davis, A. K.
Cao, D.
Michel, D. T.
Hohenberger, M.
Edgell, D. H.
Epstein, R.
Goncharov, V. N.
Hu, S. X.
Igumenshchev, I. V.
Marozas, J. A.
Maximov, A. V.
Myatt, J. F.
Radha, P. B.
Regan, S. P.
Sangster, T. C.
Froula, D. H.
PHYSICS OF PLASMAS, 2016, 23 (05)
[2] Early-Time Symmetry Tuning in the Presence of Cross-Beam Energy Transfer in ICF Experiments on the National Ignition Facility
Dewald, E. L.
Milovich, J. L.
Michel, P.
Landen, O. L.
Kline, J. L.
Glenn, S.
Jones, O.
Kalantar, D. H.
Pak, A.
Robey, H. F.
Kyrala, G. A.
Divol, L.
Benedetti, L. R.
Holder, J.
Widmann, K.
Moore, A.
Schneider, M. B.
Doeppner, T.
Tommasini, R.
Bradley, D. K.
Bell, P.
Ehrlich, B.
Thomas, C. A.
Shaw, M.
Widmayer, C.
Callahan, D. A.
Meezan, N. B.
Town, R. P. J.
Hamza, A.
Dzenitis, B.
Nikroo, A.
Moreno, K.
Van Wonterghem, B.
Mackinnon, A. J.
Glenzer, S. H.
MacGowan, B. J.
Kilkenny, J. D.
Edwards, M. J.
Atherton, L. J.
Moses, E. I.
PHYSICAL REVIEW LETTERS, 2013, 111 (23)
[3] Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions
Marozas, J. A.
Hohenberger, M.
Rosenberg, M. J.
Turnbull, D.
Collins, T. J. B.
Radha, P. B.
McKenty, P. W.
Zuegel, J. D.
Marshall, F. J.
Regan, S. P.
Sangster, T. C.
Seka, W.
Campbell, E. M.
Goncharov, V. N.
Bowers, M. W.
Di Nicola, J. -M. G.
Erbert, G.
MacGowan, B. J.
Pelz, L. J.
Moody, J.
Yang, S. T.
PHYSICS OF PLASMAS, 2018, 25 (05)
[4] Understanding asymmetries using integrated simulations of capsule implosions in low gas-fill hohlraums at the National Ignition Facility
Milovich, J. L.
Casey, D. C.
MacGowan, B.
Clark, D.
Mariscal, D.
Ma, T.
Baker, K.
Bionta, R.
Hahn, K.
Moore, A.
Schlossberg, D.
Hartouni, E.
Sepke, S.
Landen, O.
PLASMA PHYSICS AND CONTROLLED FUSION, 2021, 63 (02)
[5] First Observation of Cross-Beam Energy Transfer Mitigation for Direct-Drive Inertial Confinement Fusion Implosions Using Wavelength Detuning at the National Ignition Facility
Marozas, J. A.
Hohenberger, M.
Rosenberg, M. J.
Turnbull, D.
Collins, T. J. B.
Radha, P. B.
McKenty, P. W.
Zuegel, J. D.
Marshall, F. J.
Regan, S. P.
Sangster, T. C.
Seka, W.
Campbell, E. M.
Goncharov, V. N.
Bowers, M. W.
Di Nicola, J. -M. G.
Erbert, G.
MacGowan, B. J.
Pelz, L. J.
Yang, S. T.
PHYSICAL REVIEW LETTERS, 2018, 120 (08)
[6] Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility
Collins, T. J. B.
Marozas, J. A.
PHYSICS OF PLASMAS, 2018, 25 (07)
[7] Control of Be capsule low mode implosions symmetry at the National Ignition Facility
Kyrala, G. A.
Kline, J. L.
Yi, S.
Simakov, A. N.
Olson, R. E.
Wilson, D. C.
Batha, S.
Dewald, E. L.
Tommasini, R.
Ralph, J. E.
MacPhee, A. G.
Callahan, D. A.
Hurricane, O. A.
Hinkel, D. E.
Khan, S. F.
Ma, T.
Izumi, N.
Nagel, S.
Rygg, J. R.
9TH INTERNATIONAL CONFERENCE ON INERTIAL FUSION SCIENCES AND APPLICATIONS (IFSA 2015), 2016, 717
[8] Cross-beam energy transfer in conditions relevant to direct-drive implosions on OMEGA
Nguyen, K. L.
Yin, L.
Albright, B. J.
Edgell, D. H.
Follett, R. K.
Turnbull, D.
Froula, D. H.
Palastro, J. P.
PHYSICS OF PLASMAS, 2023, 30 (07)
[9] Cross-beam energy transfer in direct-drive ICF. I. Nonlinear and kinetic effects
Seaton, A. G.
Yin, L.
Follett, R. K.
Albright, B. J.
Le, A.
PHYSICS OF PLASMAS, 2022, 29 (04)
[10] Symmetry tuning via controlled crossed-beam energy transfer on the National Ignition Facility
Michel, P.
Glenzer, S. H.
Divol, L.
Bradley, D. K.
Callahan, D.
Dixit, S.
Glenn, S.
Hinkel, D.
Kirkwood, R. K.
Kline, J. L.
Kruer, W. L.
Kyrala, G. A.
Le Pape, S.
Meezan, N. B.
Town, R.
Widmann, K.
Williams, E. A.
MacGowan, B. J.
Lindl, J.
Suter, L. J.
PHYSICS OF PLASMAS, 2010, 17 (05)

← 1 2 →