First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums

E. L. Dewald; R. Tommasini; N. B. Meezan; O. L. Landen; S. Khan; R. Rygg; J. Field; A. S. Moore; D. Sayre; A. J. MacKinnon; L. F. Berzak Hopkins; L. Divol; S. Le Pape; A. Pak; C. A. Thomas; M. Farrell; A. Nikroo; O. Hurricane

doi:10.1063/1.5039385

First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums

E. L. Dewald
, R. Tommasini
, N. B. Meezan
, O. L. Landen
, S. Khan
, R. Rygg
, J. Field
, A. S. Moore
, D. Sayre
, A. J. MacKinnon
, L. F. Berzak Hopkins
, L. Divol
, S. Le Pape
, A. Pak
, C. A. Thomas
, M. Farrell
, A. Nikroo
, O. Hurricane

Research output: Contribution to journal › Article › peer-review

Abstract

In indirectly-driven Inertial Confinement Fusion (ICF) implosions, supra-thermal M-band (>2 keV) radiation from principally 4-3 resonance line transitions generated during laser irradiation at the peak power of Au hohlraum walls can preheat the fusion capsule and reduce compressional pressure. Higher Z, un-lined depleted uranium (DU) hohlraums were used for the first time in ICF implosions on the National Ignition Facility (NIF) to reduce M-band radiation levels while keeping the total radiation flux similar to Au hohlraums. First implosions in DU demonstrate an increase in in-flight density (+15%) of high density carbon capsules, and hence in stagnated hot spot temperature (+15%), hot spot x-ray (+200%) and fusion neutron yields (+100%) compared to Au hohlraums. We show analytically that these changes are consistent with the observed 40% reduction in M-band x-ray flux in DU, and are in agreement with 2D hydrodynamic simulations. This result had a major impact on ICF research on the NIF where a significant fraction of high neutron yield implosions are currently using un-lined DU hohlraums.

Original language	English
Article number	092702
Journal	Physics of Plasmas
Volume	25
Issue number	9
DOIs	https://doi.org/10.1063/1.5039385
Publication status	Published - 1 Sept 2018
Externally published	Yes

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Dewald, E. L., Tommasini, R., Meezan, N. B., Landen, O. L., Khan, S., Rygg, R., Field, J., Moore, A. S., Sayre, D., MacKinnon, A. J., Berzak Hopkins, L. F., Divol, L., Le Pape, S., Pak, A., Thomas, C. A., Farrell, M., Nikroo, A., & Hurricane, O. (2018). First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums. Physics of Plasmas, 25(9), Article 092702. https://doi.org/10.1063/1.5039385

@article{f6ff54aff7e04c52954e6035a7eda8b9,

title = "First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums",

abstract = "In indirectly-driven Inertial Confinement Fusion (ICF) implosions, supra-thermal M-band (>2 keV) radiation from principally 4-3 resonance line transitions generated during laser irradiation at the peak power of Au hohlraum walls can preheat the fusion capsule and reduce compressional pressure. Higher Z, un-lined depleted uranium (DU) hohlraums were used for the first time in ICF implosions on the National Ignition Facility (NIF) to reduce M-band radiation levels while keeping the total radiation flux similar to Au hohlraums. First implosions in DU demonstrate an increase in in-flight density (+15\%) of high density carbon capsules, and hence in stagnated hot spot temperature (+15\%), hot spot x-ray (+200\%) and fusion neutron yields (+100\%) compared to Au hohlraums. We show analytically that these changes are consistent with the observed 40\% reduction in M-band x-ray flux in DU, and are in agreement with 2D hydrodynamic simulations. This result had a major impact on ICF research on the NIF where a significant fraction of high neutron yield implosions are currently using un-lined DU hohlraums.",

author = "Dewald, \{E. L.\} and R. Tommasini and Meezan, \{N. B.\} and Landen, \{O. L.\} and S. Khan and R. Rygg and J. Field and Moore, \{A. S.\} and D. Sayre and MacKinnon, \{A. J.\} and \{Berzak Hopkins\}, \{L. F.\} and L. Divol and \{Le Pape\}, S. and A. Pak and Thomas, \{C. A.\} and M. Farrell and A. Nikroo and O. Hurricane",

note = "Publisher Copyright: {\textcopyright} 2018 Author(s).",

year = "2018",

month = sep,

day = "1",

doi = "10.1063/1.5039385",

language = "English",

volume = "25",

journal = "Physics of Plasmas",

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Dewald, EL, Tommasini, R, Meezan, NB, Landen, OL, Khan, S, Rygg, R, Field, J, Moore, AS, Sayre, D, MacKinnon, AJ, Berzak Hopkins, LF, Divol, L, Le Pape, S, Pak, A, Thomas, CA, Farrell, M, Nikroo, A & Hurricane, O 2018, 'First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums', Physics of Plasmas, vol. 25, no. 9, 092702. https://doi.org/10.1063/1.5039385

TY - JOUR

T1 - First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums

AU - Dewald, E. L.

AU - Tommasini, R.

AU - Meezan, N. B.

AU - Landen, O. L.

AU - Khan, S.

AU - Rygg, R.

AU - Field, J.

AU - Moore, A. S.

AU - Sayre, D.

AU - MacKinnon, A. J.

AU - Berzak Hopkins, L. F.

AU - Divol, L.

AU - Le Pape, S.

AU - Pak, A.

AU - Thomas, C. A.

AU - Farrell, M.

AU - Nikroo, A.

AU - Hurricane, O.

PY - 2018/9/1

Y1 - 2018/9/1

N2 - In indirectly-driven Inertial Confinement Fusion (ICF) implosions, supra-thermal M-band (>2 keV) radiation from principally 4-3 resonance line transitions generated during laser irradiation at the peak power of Au hohlraum walls can preheat the fusion capsule and reduce compressional pressure. Higher Z, un-lined depleted uranium (DU) hohlraums were used for the first time in ICF implosions on the National Ignition Facility (NIF) to reduce M-band radiation levels while keeping the total radiation flux similar to Au hohlraums. First implosions in DU demonstrate an increase in in-flight density (+15%) of high density carbon capsules, and hence in stagnated hot spot temperature (+15%), hot spot x-ray (+200%) and fusion neutron yields (+100%) compared to Au hohlraums. We show analytically that these changes are consistent with the observed 40% reduction in M-band x-ray flux in DU, and are in agreement with 2D hydrodynamic simulations. This result had a major impact on ICF research on the NIF where a significant fraction of high neutron yield implosions are currently using un-lined DU hohlraums.

AB - In indirectly-driven Inertial Confinement Fusion (ICF) implosions, supra-thermal M-band (>2 keV) radiation from principally 4-3 resonance line transitions generated during laser irradiation at the peak power of Au hohlraum walls can preheat the fusion capsule and reduce compressional pressure. Higher Z, un-lined depleted uranium (DU) hohlraums were used for the first time in ICF implosions on the National Ignition Facility (NIF) to reduce M-band radiation levels while keeping the total radiation flux similar to Au hohlraums. First implosions in DU demonstrate an increase in in-flight density (+15%) of high density carbon capsules, and hence in stagnated hot spot temperature (+15%), hot spot x-ray (+200%) and fusion neutron yields (+100%) compared to Au hohlraums. We show analytically that these changes are consistent with the observed 40% reduction in M-band x-ray flux in DU, and are in agreement with 2D hydrodynamic simulations. This result had a major impact on ICF research on the NIF where a significant fraction of high neutron yield implosions are currently using un-lined DU hohlraums.

U2 - 10.1063/1.5039385

DO - 10.1063/1.5039385

M3 - Article

AN - SCOPUS:85053145876

SN - 1070-664X

VL - 25

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 9

M1 - 092702

ER -

First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums

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