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Title: Inverse-collimated proton radiography for imaging thin materials

Relativistic, magnetically-focused proton radiography was invented at Los Alamos National Laboratory using the 800 MeV LANSCE beam, and is inherently well-suited to imaging dense objects, at areal densities >20 g cm -2. However, if the unscattered portion of the transmitted beam is removed at the Fourier plane through inverse-collimation, this system becomes highly sensitive to very thin media, of areal densities <100 mg cm -2. Here, this inversecollimation scheme is described in detail and demonstrated by imaging Xe gas with a shockwave generated by an aluminum plate compressing the gas at Mach 8.8. With a 5-mrad inverse collimator, an areal density change of just 49 mg cm-2 across the shock front is discernible with a contrast-to-noise ratio of 3. Geant4 modeling of idealized and realistic proton transports can guide the design of inverse-collimators optimized for specific experimental conditions and show that this technique performs better for thin targets with reduced incident proton beam emittance. This work increases the range of areal densities to which the system is sensitive to span from ~25 mg cm -2 to 100 g cm -2, exceeding three orders of magnitude. This enables the simultaneous imaging of a dense system, as well as thin jets andmore » ejecta material that are otherwise difficult to characterize with high-energy proton radiography.« less
Authors:
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-23988
Journal ID: ISSN 0034-6748; TRN: US1800627
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 1; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION
OSTI Identifier:
1414092

Freeman, Matthew S., Allison, Jason, Andrews, Malcolm, Ferm, Eric, Goett, John J., Kwiatkowski, Kris, Lopez, Julian, Mariam, Fesseha, Marr-Lyon, Mark, Martinez, Michael, Medina, Jason, Medina, Patrick, Merrill, Frank E., Morris, Chris L., Murray, Matthew M., Nedrow, Paul, Neukirch, Levi P., Prestridge, Katherine, Rigg, Paolo, Saunders, Alexander, Schurman, Tamsen, Tainter, Amy, Trouw, Frans, Tupa, Dale, Tybo, Josh, Vogan-McNeil, Wendy, and Wilde, Carl. Inverse-collimated proton radiography for imaging thin materials. United States: N. p., Web. doi:10.1063/1.4973767.
Freeman, Matthew S., Allison, Jason, Andrews, Malcolm, Ferm, Eric, Goett, John J., Kwiatkowski, Kris, Lopez, Julian, Mariam, Fesseha, Marr-Lyon, Mark, Martinez, Michael, Medina, Jason, Medina, Patrick, Merrill, Frank E., Morris, Chris L., Murray, Matthew M., Nedrow, Paul, Neukirch, Levi P., Prestridge, Katherine, Rigg, Paolo, Saunders, Alexander, Schurman, Tamsen, Tainter, Amy, Trouw, Frans, Tupa, Dale, Tybo, Josh, Vogan-McNeil, Wendy, & Wilde, Carl. Inverse-collimated proton radiography for imaging thin materials. United States. doi:10.1063/1.4973767.
Freeman, Matthew S., Allison, Jason, Andrews, Malcolm, Ferm, Eric, Goett, John J., Kwiatkowski, Kris, Lopez, Julian, Mariam, Fesseha, Marr-Lyon, Mark, Martinez, Michael, Medina, Jason, Medina, Patrick, Merrill, Frank E., Morris, Chris L., Murray, Matthew M., Nedrow, Paul, Neukirch, Levi P., Prestridge, Katherine, Rigg, Paolo, Saunders, Alexander, Schurman, Tamsen, Tainter, Amy, Trouw, Frans, Tupa, Dale, Tybo, Josh, Vogan-McNeil, Wendy, and Wilde, Carl. 2017. "Inverse-collimated proton radiography for imaging thin materials". United States. doi:10.1063/1.4973767. https://www.osti.gov/servlets/purl/1414092.
@article{osti_1414092,
title = {Inverse-collimated proton radiography for imaging thin materials},
author = {Freeman, Matthew S. and Allison, Jason and Andrews, Malcolm and Ferm, Eric and Goett, John J. and Kwiatkowski, Kris and Lopez, Julian and Mariam, Fesseha and Marr-Lyon, Mark and Martinez, Michael and Medina, Jason and Medina, Patrick and Merrill, Frank E. and Morris, Chris L. and Murray, Matthew M. and Nedrow, Paul and Neukirch, Levi P. and Prestridge, Katherine and Rigg, Paolo and Saunders, Alexander and Schurman, Tamsen and Tainter, Amy and Trouw, Frans and Tupa, Dale and Tybo, Josh and Vogan-McNeil, Wendy and Wilde, Carl},
abstractNote = {Relativistic, magnetically-focused proton radiography was invented at Los Alamos National Laboratory using the 800 MeV LANSCE beam, and is inherently well-suited to imaging dense objects, at areal densities >20 g cm-2. However, if the unscattered portion of the transmitted beam is removed at the Fourier plane through inverse-collimation, this system becomes highly sensitive to very thin media, of areal densities <100 mg cm-2. Here, this inversecollimation scheme is described in detail and demonstrated by imaging Xe gas with a shockwave generated by an aluminum plate compressing the gas at Mach 8.8. With a 5-mrad inverse collimator, an areal density change of just 49 mg cm-2 across the shock front is discernible with a contrast-to-noise ratio of 3. Geant4 modeling of idealized and realistic proton transports can guide the design of inverse-collimators optimized for specific experimental conditions and show that this technique performs better for thin targets with reduced incident proton beam emittance. This work increases the range of areal densities to which the system is sensitive to span from ~25 mg cm-2 to 100 g cm-2, exceeding three orders of magnitude. This enables the simultaneous imaging of a dense system, as well as thin jets and ejecta material that are otherwise difficult to characterize with high-energy proton radiography.},
doi = {10.1063/1.4973767},
journal = {Review of Scientific Instruments},
number = 1,
volume = 88,
place = {United States},
year = {2017},
month = {1}
}

Works referenced in this record:

The evolution of solid density within a thermal explosion. I. Proton radiography of pre-ignition expansion, material motion, and chemical decomposition
journal, May 2012
  • Smilowitz, L.; Henson, B. F.; Romero, J. J.
  • Journal of Applied Physics, Vol. 111, Issue 10, Article No. 103515
  • DOI: 10.1063/1.4711071

The evolution of solid density within a thermal explosion II. Dynamic proton radiography of cracking and solid consumption by burning
journal, May 2012
  • Smilowitz, L.; Henson, B. F.; Romero, J. J.
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  • DOI: 10.1063/1.4711072

Direct Observation of the Phenomenology of a Solid Thermal Explosion Using Time-Resolved Proton Radiography
journal, June 2008