Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519).

Alexander, C. Scott; Haill, Thomas A.; Dalton, Devon Gardner; Rovang, Dean Curtis; Lamppa, Derek C.

doi:10.2172/1096247

Title: Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519).

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Abstract

The recently developed Magnetically Applied Pressure-Shear (MAPS) experimental technique to measure material shear strength at high pressures on magneto-hydrodynamic (MHD) drive pulsed power platforms was fielded on August 16, 2013 on shot Z2544 utilizing hardware set A0283A. Several technical and engineering challenges were overcome in the process leading to the attempt to measure the dynamic strength of NNSA Ta at 50 GPa. The MAPS technique relies on the ability to apply an external magnetic field properly aligned and time correlated with the MHD pulse. The load design had to be modified to accommodate the external field coils and additional support was required to manage stresses from the pulsed magnets. Further, this represents the first time transverse velocity interferometry has been applied to diagnose a shot at Z. All subsystems performed well with only minor issues related to the new feed design which can be easily addressed by modifying the current pulse shape. Despite the success of each new component, the experiment failed to measure strength in the samples due to spallation failure, most likely in the diamond anvils. To address this issue, hydrocode simulations are being used to evaluate a modified design using LiF windows to minimize tension in themore »« less

Authors:: Alexander, C. Scott; Haill, Thomas A.; Dalton, Devon Gardner; Rovang, Dean Curtis; Lamppa, Derek C.

Publication Date:: Sun Sep 01 00:00:00 EDT 2013

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1096247

Report Number(s):: SAND2013-8035
476325

DOE Contract Number:: AC04-94AL85000

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Citation Formats


                    Alexander, C. Scott, Haill, Thomas A., Dalton, Devon Gardner, Rovang, Dean Curtis, and Lamppa, Derek C. Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519)..  United States: N. p., 2013. 
        Web.  doi:10.2172/1096247.

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                    Alexander, C. Scott, Haill, Thomas A., Dalton, Devon Gardner, Rovang, Dean Curtis, & Lamppa, Derek C. Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519)..  United States.  https://doi.org/10.2172/1096247

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                    Alexander, C. Scott, Haill, Thomas A., Dalton, Devon Gardner, Rovang, Dean Curtis, and Lamppa, Derek C. 2013.  
        "Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519).".  United States.  https://doi.org/10.2172/1096247.  https://www.osti.gov/servlets/purl/1096247.

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@article{osti_1096247,

  title        = {Fielding the magnetically applied pressure-shear technique on the Z accelerator (completion report for MRT 4519).},

  author       = {Alexander, C. Scott and Haill, Thomas A. and Dalton, Devon Gardner and Rovang, Dean Curtis and Lamppa, Derek C.},

  abstractNote = {The recently developed Magnetically Applied Pressure-Shear (MAPS) experimental technique to measure material shear strength at high pressures on magneto-hydrodynamic (MHD) drive pulsed power platforms was fielded on August 16, 2013 on shot Z2544 utilizing hardware set A0283A. Several technical and engineering challenges were overcome in the process leading to the attempt to measure the dynamic strength of NNSA Ta at 50 GPa. The MAPS technique relies on the ability to apply an external magnetic field properly aligned and time correlated with the MHD pulse. The load design had to be modified to accommodate the external field coils and additional support was required to manage stresses from the pulsed magnets. Further, this represents the first time transverse velocity interferometry has been applied to diagnose a shot at Z. All subsystems performed well with only minor issues related to the new feed design which can be easily addressed by modifying the current pulse shape. Despite the success of each new component, the experiment failed to measure strength in the samples due to spallation failure, most likely in the diamond anvils. To address this issue, hydrocode simulations are being used to evaluate a modified design using LiF windows to minimize tension in the diamond and prevent spall. Another option to eliminate the diamond material from the experiment is also being investigated.},

  doi          = {10.2172/1096247},

  url          = {https://www.osti.gov/biblio/1096247},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Sep 01 00:00:00 EDT 2013},

  month        = {Sun Sep 01 00:00:00 EDT 2013}

}

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