Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)

M. Gatu Johnson; J. A. Frenje; D. T. Casey; C. K. Li; F. H. Séguin; R. Petrasso; R. Ashabranner; R. M. Bionta; D. L. Bleuel; E. J. Bond; J. A. Caggiano; A. Carpenter; C. J. Cerjan; T. J. Clancy; T. Doeppner; M. J. Eckart; M. J. Edwards; S. Friedrich; S. H. Glenzer; S. W. Haan; E. P. Hartouni; R. Hatarik; S. P. Hatchett; O. S. Jones; G. Kyrala; S. Le Pape; R. A. Lerche; O. L. Landen; T. Ma; A. J. MacKinnon; M. A. McKernan; M. J. Moran; E. Moses; D. H. Munro; J. McNaney; H. S. Park; J. Ralph; B. Remington; J. R. Rygg; S. M. Sepke; V. Smalyuk; B. Spears; P. T. Springer; C. B. Yeamans; M. Farrell; D. Jasion; J. D. Kilkenny; A. Nikroo; R. Paguio; J. P. Knauer; V. Yu Glebov; T. C. Sangster; R. Betti; C. Stoeckl; J. Magoon; M. J. Shoup; G. P. Grim; J. Kline; G. L. Morgan; T. J. Murphy; R. J. Leeper; C. L. Ruiz; G. W. Cooper; A. J. Nelson

doi:10.1063/1.4728095

Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)

M. Gatu Johnson
, J. A. Frenje
, D. T. Casey
, C. K. Li
, F. H. Séguin
, R. Petrasso
, R. Ashabranner
, R. M. Bionta
, D. L. Bleuel
, E. J. Bond
, J. A. Caggiano
, A. Carpenter
, C. J. Cerjan
, T. J. Clancy
, T. Doeppner
, M. J. Eckart
, M. J. Edwards
, S. Friedrich
, S. H. Glenzer
, S. W. Haan

E. P. Hartouni, R. Hatarik, S. P. Hatchett, O. S. Jones, G. Kyrala, S. Le Pape, R. A. Lerche, O. L. Landen, T. Ma, A. J. MacKinnon, M. A. McKernan, M. J. Moran, E. Moses, D. H. Munro, J. McNaney, H. S. Park, J. Ralph, B. Remington, J. R. Rygg, S. M. Sepke, V. Smalyuk, B. Spears, P. T. Springer, C. B. Yeamans, M. Farrell, D. Jasion, J. D. Kilkenny, A. Nikroo, R. Paguio, J. P. Knauer, V. Yu Glebov, T. C. Sangster, R. Betti, C. Stoeckl, J. Magoon, M. J. Shoup, G. P. Grim, J. Kline, G. L. Morgan, T. J. Murphy, R. J. Leeper, C. L. Ruiz, G. W. Cooper, A. J. Nelson

Plasma Science and Fusion Center
Lawrence Livermore National Laboratory
General Atomics
University of Rochester Laboratory for Laser Energetics
MST-8, Los Alamos National Laboratory
Sandia National Laboratories
University of New Mexico

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

Abstract

DT neutron yield (Y _n), ion temperature (T _i), and down-scatter ratio (dsr) determined from measured neutron spectra are essential metrics for diagnosing the performance of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). A suite of neutron-time-of-flight (nTOF) spectrometers and a magnetic recoil spectrometer (MRS) have been implemented in different locations around the NIF target chamber, providing good implosion coverage and the complementarity required for reliable measurements of Y _n, T _i, and dsr. From the measured dsr value, an areal density (ρR) is determined through the relationship ρR _tot (gcm ²)=(20.4 ± 0.6) × dsr _{10-12 MeV}. The proportionality constant is determined considering implosion geometry, neutron attenuation, and energy range used for the dsr measurement. To ensure high accuracy in the measurements, a series of commissioning experiments using exploding pushers have been used for in situ calibration of the as-built spectrometers, which are now performing to the required accuracy. Recent data obtained with the MRS and nTOFs indicate that the implosion performance of cryogenically layered DT implosions, characterized by the experimental ignition threshold factor (ITFx), which is a function of dsr (or fuel ρR) and Y _n, has improved almost two orders of magnitude since the first shot in September, 2010.

Original language	English
Article number	10D308
Journal	Review of Scientific Instruments
Volume	83
Issue number	10
DOIs	https://doi.org/10.1063/1.4728095
Publication status	Published - 1 Oct 2012
Externally published	Yes

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10.1063/1.4728095

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Johnson, M. G., Frenje, J. A., Casey, D. T., Li, C. K., Séguin, F. H., Petrasso, R., Ashabranner, R., Bionta, R. M., Bleuel, D. L., Bond, E. J., Caggiano, J. A., Carpenter, A., Cerjan, C. J., Clancy, T. J., Doeppner, T., Eckart, M. J., Edwards, M. J., Friedrich, S., Glenzer, S. H., ... Nelson, A. J. (2012). Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited). Review of Scientific Instruments, 83(10), Article 10D308. https://doi.org/10.1063/1.4728095

@article{74cc9cd4b6274332b70303def7255eef,

title = "Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)",

abstract = "DT neutron yield (Y n), ion temperature (T i), and down-scatter ratio (dsr) determined from measured neutron spectra are essential metrics for diagnosing the performance of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). A suite of neutron-time-of-flight (nTOF) spectrometers and a magnetic recoil spectrometer (MRS) have been implemented in different locations around the NIF target chamber, providing good implosion coverage and the complementarity required for reliable measurements of Y n, T i, and dsr. From the measured dsr value, an areal density (ρR) is determined through the relationship ρR tot (gcm 2)=(20.4 ± 0.6) × dsr 10-12 MeV. The proportionality constant is determined considering implosion geometry, neutron attenuation, and energy range used for the dsr measurement. To ensure high accuracy in the measurements, a series of commissioning experiments using exploding pushers have been used for in situ calibration of the as-built spectrometers, which are now performing to the required accuracy. Recent data obtained with the MRS and nTOFs indicate that the implosion performance of cryogenically layered DT implosions, characterized by the experimental ignition threshold factor (ITFx), which is a function of dsr (or fuel ρR) and Y n, has improved almost two orders of magnitude since the first shot in September, 2010.",

author = "Johnson, \{M. Gatu\} and Frenje, \{J. A.\} and Casey, \{D. T.\} and Li, \{C. K.\} and S{\'e}guin, \{F. H.\} and R. Petrasso and R. Ashabranner and Bionta, \{R. M.\} and Bleuel, \{D. L.\} and Bond, \{E. J.\} and Caggiano, \{J. A.\} and A. Carpenter and Cerjan, \{C. J.\} and Clancy, \{T. J.\} and T. Doeppner and Eckart, \{M. J.\} and Edwards, \{M. J.\} and S. Friedrich and Glenzer, \{S. H.\} and Haan, \{S. W.\} and Hartouni, \{E. P.\} and R. Hatarik and Hatchett, \{S. P.\} and Jones, \{O. S.\} and G. Kyrala and \{Le Pape\}, S. and Lerche, \{R. A.\} and Landen, \{O. L.\} and T. Ma and MacKinnon, \{A. J.\} and McKernan, \{M. A.\} and Moran, \{M. J.\} and E. Moses and Munro, \{D. H.\} and J. McNaney and Park, \{H. S.\} and J. Ralph and B. Remington and Rygg, \{J. R.\} and Sepke, \{S. M.\} and V. Smalyuk and B. Spears and Springer, \{P. T.\} and Yeamans, \{C. B.\} and M. Farrell and D. Jasion and Kilkenny, \{J. D.\} and A. Nikroo and R. Paguio and Knauer, \{J. P.\} and \{Yu Glebov\}, V. and Sangster, \{T. C.\} and R. Betti and C. Stoeckl and J. Magoon and Shoup, \{M. J.\} and Grim, \{G. P.\} and J. Kline and Morgan, \{G. L.\} and Murphy, \{T. J.\} and Leeper, \{R. J.\} and Ruiz, \{C. L.\} and Cooper, \{G. W.\} and Nelson, \{A. J.\}",

year = "2012",

month = oct,

day = "1",

doi = "10.1063/1.4728095",

language = "English",

volume = "83",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

number = "10",

}

Johnson, MG, Frenje, JA, Casey, DT, Li, CK, Séguin, FH, Petrasso, R, Ashabranner, R, Bionta, RM, Bleuel, DL, Bond, EJ, Caggiano, JA, Carpenter, A, Cerjan, CJ, Clancy, TJ, Doeppner, T, Eckart, MJ, Edwards, MJ, Friedrich, S, Glenzer, SH, Haan, SW, Hartouni, EP, Hatarik, R, Hatchett, SP, Jones, OS, Kyrala, G, Le Pape, S, Lerche, RA, Landen, OL, Ma, T, MacKinnon, AJ, McKernan, MA, Moran, MJ, Moses, E, Munro, DH, McNaney, J, Park, HS, Ralph, J, Remington, B, Rygg, JR, Sepke, SM, Smalyuk, V, Spears, B, Springer, PT, Yeamans, CB, Farrell, M, Jasion, D, Kilkenny, JD, Nikroo, A, Paguio, R, Knauer, JP, Yu Glebov, V, Sangster, TC, Betti, R, Stoeckl, C, Magoon, J, Shoup, MJ, Grim, GP, Kline, J, Morgan, GL, Murphy, TJ, Leeper, RJ, Ruiz, CL, Cooper, GW & Nelson, AJ 2012, 'Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)', Review of Scientific Instruments, vol. 83, no. 10, 10D308. https://doi.org/10.1063/1.4728095

TY - JOUR

T1 - Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)

AU - Johnson, M. Gatu

AU - Frenje, J. A.

AU - Casey, D. T.

AU - Li, C. K.

AU - Séguin, F. H.

AU - Petrasso, R.

AU - Ashabranner, R.

AU - Bionta, R. M.

AU - Bleuel, D. L.

AU - Bond, E. J.

AU - Caggiano, J. A.

AU - Carpenter, A.

AU - Cerjan, C. J.

AU - Clancy, T. J.

AU - Doeppner, T.

AU - Eckart, M. J.

AU - Edwards, M. J.

AU - Friedrich, S.

AU - Glenzer, S. H.

AU - Haan, S. W.

AU - Hartouni, E. P.

AU - Hatarik, R.

AU - Hatchett, S. P.

AU - Jones, O. S.

AU - Kyrala, G.

AU - Le Pape, S.

AU - Lerche, R. A.

AU - Landen, O. L.

AU - Ma, T.

AU - MacKinnon, A. J.

AU - McKernan, M. A.

AU - Moran, M. J.

AU - Moses, E.

AU - Munro, D. H.

AU - McNaney, J.

AU - Park, H. S.

AU - Ralph, J.

AU - Remington, B.

AU - Rygg, J. R.

AU - Sepke, S. M.

AU - Smalyuk, V.

AU - Spears, B.

AU - Springer, P. T.

AU - Yeamans, C. B.

AU - Farrell, M.

AU - Jasion, D.

AU - Kilkenny, J. D.

AU - Nikroo, A.

AU - Paguio, R.

AU - Knauer, J. P.

AU - Yu Glebov, V.

AU - Sangster, T. C.

AU - Betti, R.

AU - Stoeckl, C.

AU - Magoon, J.

AU - Shoup, M. J.

AU - Grim, G. P.

AU - Kline, J.

AU - Morgan, G. L.

AU - Murphy, T. J.

AU - Leeper, R. J.

AU - Ruiz, C. L.

AU - Cooper, G. W.

AU - Nelson, A. J.

PY - 2012/10/1

Y1 - 2012/10/1

N2 - DT neutron yield (Y n), ion temperature (T i), and down-scatter ratio (dsr) determined from measured neutron spectra are essential metrics for diagnosing the performance of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). A suite of neutron-time-of-flight (nTOF) spectrometers and a magnetic recoil spectrometer (MRS) have been implemented in different locations around the NIF target chamber, providing good implosion coverage and the complementarity required for reliable measurements of Y n, T i, and dsr. From the measured dsr value, an areal density (ρR) is determined through the relationship ρR tot (gcm 2)=(20.4 ± 0.6) × dsr 10-12 MeV. The proportionality constant is determined considering implosion geometry, neutron attenuation, and energy range used for the dsr measurement. To ensure high accuracy in the measurements, a series of commissioning experiments using exploding pushers have been used for in situ calibration of the as-built spectrometers, which are now performing to the required accuracy. Recent data obtained with the MRS and nTOFs indicate that the implosion performance of cryogenically layered DT implosions, characterized by the experimental ignition threshold factor (ITFx), which is a function of dsr (or fuel ρR) and Y n, has improved almost two orders of magnitude since the first shot in September, 2010.

AB - DT neutron yield (Y n), ion temperature (T i), and down-scatter ratio (dsr) determined from measured neutron spectra are essential metrics for diagnosing the performance of inertial confinement fusion (ICF) implosions at the National Ignition Facility (NIF). A suite of neutron-time-of-flight (nTOF) spectrometers and a magnetic recoil spectrometer (MRS) have been implemented in different locations around the NIF target chamber, providing good implosion coverage and the complementarity required for reliable measurements of Y n, T i, and dsr. From the measured dsr value, an areal density (ρR) is determined through the relationship ρR tot (gcm 2)=(20.4 ± 0.6) × dsr 10-12 MeV. The proportionality constant is determined considering implosion geometry, neutron attenuation, and energy range used for the dsr measurement. To ensure high accuracy in the measurements, a series of commissioning experiments using exploding pushers have been used for in situ calibration of the as-built spectrometers, which are now performing to the required accuracy. Recent data obtained with the MRS and nTOFs indicate that the implosion performance of cryogenically layered DT implosions, characterized by the experimental ignition threshold factor (ITFx), which is a function of dsr (or fuel ρR) and Y n, has improved almost two orders of magnitude since the first shot in September, 2010.

U2 - 10.1063/1.4728095

DO - 10.1063/1.4728095

M3 - Article

AN - SCOPUS:84868340695

SN - 0034-6748

VL - 83

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10D308

ER -

Neutron spectrometry-An essential tool for diagnosing implosions at the National Ignition Facility (invited)

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