☆ 4.5 Article Proceedings Paper

Using multiple neutron time of flight detectors to determine the hot spot velocity

REVIEW OF SCIENTIFIC INSTRUMENTS (2018)

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REVIEW OF SCIENTIFIC INSTRUMENTS

卷 89, 期 10, 页码 -

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AMER INST PHYSICS

DOI: 10.1063/1.5039372

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Instruments & Instrumentation Physics, Applied

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U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]

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An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is used to infer the mean energy of the emitted neutrons. Published by AIP Publishing.

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Burning plasma achieved in inertial fusion (vol 601, pg 542, 2022)

A. B. Zylstra, O. A. Hurricane, D. A. Callahan, A. L. Kritcher, J. E. Ralph, H. F. Robey, J. S. Ross, C. V. Young, K. L. Baker, D. T. Casey, T. Doppner, L. Divol, M. Hohenberger, S. Le Pape, A. Pak, P. K. Patel, R. Tommasini, S. J. Ali, P. A. Amendt, L. J. Atherton, B. Bachmann, D. Bailey, L. R. Benedetti, L. Berzak Hopkins, R. Betti, S. D. Bhandarkar, J. Biener, R. M. Bionta, N. W. Birge, E. J. Bond, D. K. Bradley, T. Braun, T. M. Briggs, M. W. Bruhn, P. M. Celliers, B. Chang, T. Chapman, H. Chen, C. Choate, A. R. Christopherson, D. S. Clark, J. W. Crippen, E. L. Dewald, T. R. Dittrich, M. J. Edwards, W. A. Farmer, J. E. Field, D. Fittinghoff, J. Frenje, J. Gaffney, M. Gatu Johnson, S. H. Glenzer, G. P. Grim, S. Haan, K. D. Hahn, G. N. Hall, B. A. Hammel, J. Harte, E. Hartouni, J. E. Heebner, V. J. Hernandez, H. Herrmann, M. C. Herrmann, D. E. Hinkel, D. D. Ho, J. P. Holder, W. W. Hsing, H. Huang, K. D. Humbird, N. Izumi, L. C. Jarrott, J. Jeet, O. Jones, G. D. Kerbel, S. M. Kerr, S. F. Khan, J. Kilkenny, Y. Kim, H. Geppert Kleinrath, V. Geppert Kleinrath, C. Kong, J. M. Koning, J. J. Kroll, M. K. G. Kruse, B. Kustowski, O. L. Landen, S. Langer, D. Larson, N. C. Lemos, J. D. Lindl, T. Ma, M. J. MacDonald, B. J. MacGowan, A. J. Mackinnon, S. A. MacLaren, A. G. MacPhee, M. M. Marinak, D. A. Mariscal, E. V. Marley, L. Masse, K. Meaney, N. B. Meezan, P. A. Michel, M. Millot, J. L. Milovich, J. D. Moody, A. S. Moore, J. W. Morton, T. Murphy, K. Newman, J. -m. g. Di Nicola, A. Nikroo, R. Nora, M. V. Patel, L. J. Pelz, J. L. Peterson, Y. Ping, B. B. Pollock, M. Ratledge, N. G. Rice, H. Rinderknecht, M. Rosen, M. S. Rubery, J. D. Salmonson, J. Sater, S. Schiaffino, D. J. Schlossberg, M. B. Schneider, C. R. Schroeder, H. A. Scott, S. M. Sepke, K. Sequoia, M. W. Sherlock, S. Shin, V. A. Smalyuk, B. K. Spears, P. T. Springer, M. Stadermann, S. Stoupin, D. J. Strozzi, L. J. Suter, C. A. Thomas, R. P. J. Town, E. R. Tubman, C. Trosseille, P. L. Volegov, C. R. Weber, K. Widmann, C. Wild, C. H. Wilde, B. M. Van Wonterghem, D. T. Woods, B. N. Woodworth, M. Yamaguchi, S. T. Yang, G. B. Zimmerman

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Article Physics, Fluids & Plasmas

Development of a bright MeV photon source with compound parabolic concentrator targets on the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser

S. M. Kerr, D. Rusby, G. J. Williams, K. Meaney, D. J. Schlossberg, A. Aghedo, D. Alessi, J. Ayers, S. Azhar, M. B. Aufderheide, M. W. Bowers, J. D. Bude, H. Chen, G. Cochran, J. Crane, J. M. Di Nicola, D. N. Fittinghoff, P. Fitzsimmons, H. Geppert-Kleinrath, B. Golick, G. P. Grim, A. Haid, M. Hamamoto, R. Heredia, M. Hermann, S. Herriot, M. P. Hill, W. Hoke, D. Kalantar, A. Kemp, Y. Kim, K. LaFortune, N. Lemos, A. Link, R. Lowe-Webb, A. MacPhee, M. Manuel, D. Martinez, M. Mauldin, S. Patankar, L. Pelz, M. A. Prantil, M. Quinn, C. W. Siders, S. Vonhof, P. Wegner, S. Wilks, W. Williams, K. Youngblood, A. J. Mackinnon

Summary: Compound parabolic concentrators (CPCs) are used in the National Ignition Facility Advanced Radiographic Capability (NIF-ARC) laser to enhance electron acceleration and high energy photon production. CPC targets show significant improvement in mean electron energy (>2x) and photon brightness (>10x) compared to flat targets. Photon spectra are characterized for E-photon = 0.5 - 30 MeV using multiple diagnostic techniques, and beam width and pointing variations are provided. Efficient production of MeV photons with doses exceeding 10 rad in air at 1 m for E-photon > 0.5 MeV is observed with CPCs at I-laser asymptotic to 2 x 10^(18) W/cm(2). Promising results are achieved for the development of bright MeV x-ray and particle sources on Petawatt class laser systems. Published under an exclusive license by AIP Publishing.

PHYSICS OF PLASMAS (2023)

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Article Instruments & Instrumentation

Constraining time-dependent ion temperature measurements in inertial confinement fusion (ICF) implosions with an intermediate distance neutron time-of-flight (nToF) detector

A. S. Moore, D. J. Schlossberg, M. J. Eckart, E. P. Hartouni, T. J. Hilsabeck, J. S. Jeet, S. M. Kerr, R. C. Nora, J. Kilkenny

Summary: This paper presents a concept of using neutron time-of-flight (nToF) at intermediate distances to constrain the measurement of the time-dependence of ion temperature in inertial confinement fusion. Through simulated nToF signals and analysis, the requirements for a future detector are determined.

REVIEW OF SCIENTIFIC INSTRUMENTS (2022)

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Article Instruments & Instrumentation

Construction and study of instrument response functions for analysis of the National Ignition Facility (NIF) neutron time-of-flight detectors

S. Kerr, M. J. Eckart, K. Hahn, E. P. Hartouni, J. Jeet, O. L. Landen, A. S. Moore, D. J. Schlossberg

Summary: This study reports on the construction and validation of nToF IRFs at the NIF, with the aim to improve measurement accuracy and eliminate the need for fixed DSR baseline offsets. The IRF is divided into two parts, a core measured experimentally and a tail calibrated using data from indirect drive exploding pusher shots. A systematic parameter study found that variations in the tail components of the IRF have an impact on DSR, which agrees with non-zero DSR estimates.

REVIEW OF SCIENTIFIC INSTRUMENTS (2022)

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Article Instruments & Instrumentation

Design of a multi-detector, single line-of-sight, time-of-flight system to measure time-resolved neutron energy spectra

D. J. Schlossberg, A. S. Moore, J. S. Kallman, M. Lowry, M. J. Eckart, E. P. Hartouni, T. J. Hilsabeck, S. M. Kerr, J. D. Kilkenny

Summary: A new method is proposed in this paper to measure time-resolved neutron energy spectra in inertial confinement fusion (ICF) plasmas. By utilizing general tomographic reconstruction techniques and Monte Carlo algorithm, the time-evolving neutron energy spectra can be reconstructed. The reconstructed spectra of the main energy peak are in good agreement with synthetic spectra, but there is more error in reconstructing the downscattered spectra.

REVIEW OF SCIENTIFIC INSTRUMENTS (2022)

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Review Instruments & Instrumentation

Neutron time of flight (nToF) detectors for inertial fusion experiments

A. S. Moore, D. J. Schlossberg, B. D. Appelbe, G. A. Chandler, A. J. Crilly, M. J. Eckart, C. J. Forrest, V. Y. Glebov, G. P. Grim, E. P. Hartouni, R. Hatarik, S. M. Kerr, J. Kilkenny, J. P. Knauer

Summary: Neutrons generated in Inertial Confinement Fusion (ICF) experiments provide valuable information about the plasma conditions. The neutron time-of-flight (nToF) technique is utilized to measure the neutron energy spectrum due to the short emission time in ICF experiments. By placing detectors several meters away from the source, the neutron energy spectrum can be measured with high precision. We review the current state of nToF detectors at ICF facilities in the United States, including the measured physics, deployed detector technologies, and analysis techniques used.

REVIEW OF SCIENTIFIC INSTRUMENTS (2023)

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