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Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility

Review of Scientific Instruments

Vaughan, Jeremy V.; Ruiz, Carlos L.; Fittinghoff, D.; May, M.J.; Ampleford, David A.; Cooper, Gary W.; Chandler, Gordon A.; Hahn, K.; Styron, Jedediah D.; McWatters, B.R.; Torres, Jose A.; Maurer, A.J.; Jones, Brent M.

The one-dimensional imager of neutrons (ODIN) at the Sandia Z facility consists of a 10-cm block of tungsten with rolled edges, creating a slit imager with slit widths of either 250, 500, or 750 μm. Designed with a 1-m neutron imaging line of sight, we achieve about 4:1 magnification and 500-μm axial spatial resolution. The baseline inertial confinement fusion concept at Sandia is magnetized liner inertial fusion, which nominally creates a 1-cm line source of neutrons. ODIN was designed to determine the size, shape, and location of the neutron producing region, furthering the understanding of compression quality along the cylindrical axis of magnetized liner implosions. Challenges include discriminating neutrons from hard x-rays and gammas with adequate signal-to-noise in the 2 × 1012 deuterium-deuterium (DD) neutron yield range, as well as understanding the point spread function of the imager to various imaging detectors (namely, CR-39). Modeling efforts were conducted with MCNP6.1 to determine neutron response functions for varying configurations in a clean DD neutron environment (without x-rays or gammas). Configuration alterations that will be shown include rolled-edge slit orientation and slit width, affecting the resolution and response function. Finally, the experiment to determine CR-39 neutron sensitivity, with and without a high density polyethylene (n, p) converter, an edge spread function, and resolution will be discussed.

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TYPE Conference Poster YEAR 2018
ScopusOSTIDOI

One dimensional imager of neutrons on the Z machine

Review of Scientific Instruments

Ampleford, David A.; Ruiz, Carlos L.; Fittinghoff, David N.; Vaughan, Jeremy V.; Hahn, Kelly D.; Lahmann, Brandon; Gatu-Johnson, Maria; Frenje, Johan; Petrasso, Richard; Ball, Christopher R.; Maurer, A.; Knapp, Patrick K.; Harvey-Thompson, Adam J.; Fisher, John A.; Alberto, Perry; Torres, Jose A.; Cooper, Gary; Jones, Brent M.; Rochau, G.A.; May, Mark J.

We recently developed a one-dimensional imager of neutrons on the Z facility. The instrument is designed for Magnetized Liner Inertial Fusion (MagLIF) experiments, which produce D-D neutrons yields of ∼3 × 1012. X-ray imaging indicates that the MagLIF stagnation region is a 10-mm long, ∼100-μm diameter column. The small radial extents and present yields precluded useful radial resolution, so a one-dimensional imager was developed. The imaging component is a 100-mm thick tungsten slit; a rolled-edge slit limits variations in the acceptance angle along the source. CR39 was chosen as a detector due to its negligible sensitivity to the bright x-ray environment in Z. A layer of high density poly-ethylene is used to enhance the sensitivity of CR39. We present data from fielding the instrument on Z, demonstrating reliable imaging and track densities consistent with diagnosed yields. For yields ∼3 × 1012, we obtain resolutions of ∼500 μm.

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TYPE Journal Article YEAR 2018
ScopusOSTIDOI

Utilization of Neutron Bang-time CVD diamond detectors at the Z Accelerator

Chandler, Gordon A.; Hahn, Kelly D.; Ruiz, Carlos L.; Jones, Brent M.; Alberto, Perry J.; Torres, Jose A.; Gomez, Matthew R.; Harding, Eric H.; Harvey-Thompson, Adam J.; Hess, Mark H.; Knapp, Patrick K.; Cooper, Gary C.; Styron, Jedediah S.; Moy, Ken M.; Mckenna, Ian M.; Glebov, Vladimir Y.; Fittinghoff, David N.; May, Mark J.; Snyder, Lucas S.; Bowers, Dan B.

Abstract not provided.

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TYPE Conference Poster YEAR 2017
OSTI

Neutron Diagnostic Development fro the Z Accelerator

Hahn, Kelly D.; Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Jones, Brent M.; Gomez, Matthew R.; Knapp, Patrick K.; Sefkow, Adam B.; Hansen, Stephanie B.; Schmit, Paul S.; Harding, Eric H.; Norris, Edward T.; Torres, Jose A.; Cooper, Gary W.; Styron, Jedediah D.; Glebov, V.Yu.; Frenje, J.A.; Lahmann, B.L.; Gatu-Johnson, M.G.; Seguin, F.H.; Petrasso, R.D.; Fittinghoff, D.F.; May, M.M.; Snyder, L.S.; Moy, K.M.; Buckles, R.B.

Abstract not provided.

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TYPE Conference Poster YEAR 2016
OSTI

Overview of Neutron diagnostic measurements for MagLIF Experiments on the Z Accelerator

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

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TYPE Presentation YEAR 2016
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DIAGNOSING MAGNETIZED LINER INERTIAL FUSION EXPERIMENTS USING NEUTRON DIAGNOSTICS ON THE Z ACCELERATOR

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

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TYPE Conference Poster YEAR 2016
OSTI

Fusion-neutron measurements for magnetized liner inertial fusion experiments on the Z accelerator

Journal of Physics: Conference Series

Hahn, K.D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, S.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, P.F.; Schmit, Paul S.; Harding, Eric H.; Jennings, C.A.; Awe, T.J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, J.A.; Cuneo, M.E.; Glebov, V.Y.; Harvey-Thompson, Adam J.; Herrman, M.C.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, M.R.; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Several magnetized liner inertial fusion (MagLIF) experiments have been conducted on the Z accelerator at Sandia National Laboratories since late 2013. Measurements of the primary DD (2.45 MeV) neutrons for these experiments suggest that the neutron production is thermonuclear. Primary DD yields up to 3e12 with ion temperatures ∼2-3 keV have been achieved. Measurements of the secondary DT (14 MeV) neutrons indicate that the fuel is significantly magnetized. Measurements of down-scattered neutrons from the beryllium liner suggest ρRliner∼1g/cm2. Neutron bang times, estimated from neutron time-of-flight (nTOF) measurements, coincide with peak x-ray production. Plans to improve and expand the Z neutron diagnostic suite include neutron burn-history diagnostics, increased sensitivity and higher precision nTOF detectors, and neutron recoil-based yield and spectral measurements.

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TYPE Journal Article YEAR 2016
ScopusOSTIDOI

SNL perspective on the nTOF workshop

Jones, Brent M.; Hahn, Kelly D.; Ruiz, Carlos L.; Chandler, Gordon A.; Fehl, David L.; Lash, Joel S.; Knapp, Patrick K.; Gomez, Matthew R.; Hansen, Stephanie B.; Harding, Eric H.; McPherson, Leroy A.; Nelson, Alan J.; Rochau, G.A.; Schmit, Paul S.; Sefkow, Adam B.; Sinars, Daniel S.; Torres, Jose A.; Bur, James A.; Cooper, Gary W.; Bonura, Michael A.; Long, Joel L.; Styron, Jedediah D.; Buckles, Rob B.; Garza, Irene G.; Moy, Kenneth J.; Davis, Brent D.; Tinsley, Jim T.; Tiangco, Rod T.; Miller, Kirk M.; Mckenna, Ian M.

Abstract not provided.

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TYPE Presentation YEAR 2016
OSTI

Fusion-Neutron Measurements for Magnetized Liner Inertial Fusion Experiments on the Z Accelerator

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Herrmann, M.C.H.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

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TYPE Conference Poster YEAR 2015
OSTIDOI

Neutron Diagnostics on the Z machine

Jones, Brent M.; Hahn, Kelly D.; Ruiz, Carlos L.; Chandler, Gordon A.; Fehl, David L.; Lash, Joel S.; Knapp, Patrick K.; McPherson, Leroy A.; Nelson, Alan J.; Rochau, G.A.; Schmit, Paul S.; Sefkow, Adam B.; Sinars, Daniel S.; Torres, Jose A.; Cooper, Gary W.; Bonura, Michael A.; Long, Joel L.; Styron, Jedediah D.; Davis, Brent D.; Buckles, Rob B.; Moy, Ken M.; Miller, Kirk M.; Mckenna, Ian M.

Abstract not provided.

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TYPE Presentation YEAR 2014
OSTI
29 Results
29 Results