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Title: Laser-Driven Radiography Experiments at TRIDENT

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [1];  [1]; ORCiD logo [1]
  1. Los Alamos National Laboratory
  2. University of Rochester
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1402668
Report Number(s):
LA-UR-17-28559
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: Radiography Workshop ; 2017-09-28 - 2017-09-29 ; Los Alamos, New Mexico, United States
Country of Publication:
United States
Language:
English

Citation Formats

Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun, Favalli, Andrea, Hunter, James F., Espy, Michelle A., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, and Fernandez, Juan Carlos. Laser-Driven Radiography Experiments at TRIDENT. United States: N. p., 2017. Web.
Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun, Favalli, Andrea, Hunter, James F., Espy, Michelle A., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, & Fernandez, Juan Carlos. Laser-Driven Radiography Experiments at TRIDENT. United States.
Tobias, Benjamin John, Palaniyappan, Sasikumar, Gautier, Donald Cort, Mendez, Jacob, Burris-Mog, Trevor John, Huang, Chengkun, Favalli, Andrea, Hunter, James F., Espy, Michelle A., Schmidt, Derek William, Nelson, Ronald Owen, Sefkow, Adam, Shimada, Tsutomu, Johnson, Randall Philip, and Fernandez, Juan Carlos. Tue . "Laser-Driven Radiography Experiments at TRIDENT". United States. doi:. https://www.osti.gov/servlets/purl/1402668.
@article{osti_1402668,
title = {Laser-Driven Radiography Experiments at TRIDENT},
author = {Tobias, Benjamin John and Palaniyappan, Sasikumar and Gautier, Donald Cort and Mendez, Jacob and Burris-Mog, Trevor John and Huang, Chengkun and Favalli, Andrea and Hunter, James F. and Espy, Michelle A. and Schmidt, Derek William and Nelson, Ronald Owen and Sefkow, Adam and Shimada, Tsutomu and Johnson, Randall Philip and Fernandez, Juan Carlos},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 24 00:00:00 EDT 2017},
month = {Tue Oct 24 00:00:00 EDT 2017}
}

Conference:
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  • Images of the R2DTO resolution target were obtained during laser-driven-radiography experiments performed at the TRIDENT laser facility, and analysis of these images using the Bayesian Inference Engine (BIE) determines a most probable full-width half maximum (FWHM) spot size of 78 μm. However, significant uncertainty prevails due to variation in the measured detector blur. Propagating this uncertainty in detector blur through the forward model results in an interval of probabilistic ambiguity spanning approximately 35-195 μm when the laser energy impinges on a thick (1 mm) tantalum target. In other phases of the experiment, laser energy is deposited on a thin (~100more » nm) aluminum target placed 250 μm ahead of the tantalum converter. When the energetic electron beam is generated in this manner, upstream from the bremsstrahlung converter, the inferred spot size shifts to a range of much larger values, approximately 270-600 μm FWHM. This report discusses methods applied to obtain these intervals as well as concepts necessary for interpreting the result within a context of probabilistic quantitative inference.« less
  • TriMeV is a compact 3 MeV, 30 kA electron beam accelerator driving an x-ray radiographic source. it was previously operated by French researchers and has recently been purchased by Bechtel Nevada for experiments in Las Vegas. In normal operating mode the accelerator emits an e-beam from a flat cathode which focuses in a {approximately}10 Torr Nitrogen gas cell onto a flat bremsstrahlung target. The extremely fast 3ns rise-time of the TriMeV voltage pulse is ideal for studying beam transport issues. A series of radiographic source optimization experiments planned in collaboration with Sandia National Laboratories will investigate different diode configurations tomore » reduce the radiographic spot size. Both ballistic propagation and nonneutralized transport, where the self-fields pinch the beam, will be studied. A magnetically-immersed diode, where a cathode and confined in an {approximately}12 T solenoidal magnetic field during acceleration to the target in vacuum, will also be studied. This immersed diode previously demonstrated < 2-mm spots on the Hermes III accelerator. It is anticipated that similar results will be attained on TriMeV. A review of the operating parameters, geometry, and electrical characteristics will be presented along with an outline of the experimental program and a description of the diode and transport configurations studied. The most recent shot data will also be presented with an emphasis on the results form the immersed diode experiments.« less