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

被引：108

作者：

Johnson, M. Gatu ^{[1
]}

Frenje, J. A. ^{[1
]}

Casey, D. T. ^{[1
]}

Li, C. K. ^{[1
]}

Seguin, F. H. ^{[1
]}

Petrasso, R. ^{[1
]}

Ashabranner, R. ^{[2
]}

Bionta, R. M. ^{[2
]}

Bleuel, D. L. ^{[2
]}

Bond, E. J. ^{[2
]}

Caggiano, J. A. ^{[2
]}

Carpenter, A. ^{[2
]}

Cerjan, C. J. ^{[2
]}

Clancy, T. J. ^{[2
]}

Doeppner, T. ^{[2
]}

Eckart, M. J. ^{[2
]}

Edwards, M. J. ^{[2
]}

Friedrich, S. ^{[2
]}

Glenzer, S. H. ^{[2
]}

Haan, S. W. ^{[2
]}

Hartouni, E. P. ^{[2
]}

Hatarik, R. ^{[2
]}

Hatchett, S. P. ^{[2
]}

Jones, O. S. ^{[2
]}

Kyrala, G. ^{[2
]}

Le Pape, S. ^{[2
]}

Lerche, R. A. ^{[2
]}

Landen, O. L. ^{[2
]}

Ma, T. ^{[2
]}

MacKinnon, A. J. ^{[2
]}

McKernan, M. A. ^{[2
]}

Moran, M. J. ^{[2
]}

Moses, E. ^{[2
]}

Munro, D. H. ^{[2
]}

McNaney, J. ^{[2
]}

Park, H. S. ^{[2
]}

Ralph, J. ^{[2
]}

Remington, B. ^{[2
]}

Rygg, J. R. ^{[2
]}

Sepke, S. M. ^{[2
]}

Smalyuk, V. ^{[2
]}

Spears, B. ^{[2
]}

Springer, P. T. ^{[2
]}

Yeamans, C. B. ^{[2
]}

Farrell, M. ^{[3
]}

Jasion, D. ^{[3
]}

Kilkenny, J. D. ^{[3
]}

Nikroo, A. ^{[3
]}

Paguio, R. ^{[3
]}

Knauer, J. P. ^{[4
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

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

[3] Gen Atom Co, San Diego, CA 92186 USA

[4] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA

[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[6] Univ New Mexico, Albuquerque, NM 87131 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2012年 / 83卷 / 10期

关键词：

D O I：

10.1063/1.4728095

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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 (rho R) is determined through the relationship rho R-tot (g/cm(2)) = (20.4 +/- 0.6) x 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 rho R) and Y-n, has improved almost two orders of magnitude since the first shot in September, 2010. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4728095]

引用

页数：6

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