X-ray imaging to characterize MeV electronics propagation through plastic targets Page: 6 of 7
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With one image showing the initial spot location, size, and structure, one can get beam
direction, structural evolution spread as it propagates through the foil. There is
substantial shot-to-shot variation, and shot locations are not precisely determined a priori
so that this information is not easily acquired with single tracer layers on successive
shots. In addition, these foils can be some distance from the front or back surface, and
we can see the character of the beam away from the perturbing surfaces.
In conclusion, we have shown high Z multiple tracer layers will enable tracking high
energy electron beams within an overdense CH plasma far from the plasma boundaries.
These foils can be so thin that they should cause minimal perturbation to the propagation
of the beam. This will allow determination of the high energy electron direction and
beam spread, and investigation of the effects of boundaries on their structure.
This work was performed under the auspices of the U.S. Department of Energy by the
Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48, with the
additional corporate support of General Atomics.
 M. Tabak, J. Hammer, M.E. Glinsky, W.L. Kruer, S.C. Wilks, J. Woodworth, E.M.
Campbell, and M.D. Perry, "Ignition and gain with ultrapowerful lasers," Phys. Plasmas
5 1626-1634 (1994).
 The critical frequency for light propagation goes as the square root of the electron
density, and is >10 eV for ne ~ 1 g/cc and is >100 eV at the 200 g/cc core of a densified
target. Physis Vade Mecum, 2" edition, ed. H.L. Anderson (AIP, New York, 1981) p.
 M. Tatarakis, J.R. Davies, P. Lee, P.A. Norreys, N.G. Kassapakis, F.N. Beg, A.R.
Bell, M.G. Haines, and A.E. Dangor, "Plasma formation on the front and rear of plastic
targets due to high-intensity laser-generated fast electrons," Phys. Rev. Lett. 81 999-1002
 M. Key - private communication.
 J.R. Davies, A.R. Bell, and M. Tatarakis, "Magnetic focusing and trapping of high-
intensity laser-generated fast electrons at the rear of solid targets," Phys. Rev. B 59 6032-
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Key, M H; Stephens, R B; Koch, J & Pennington, D. X-ray imaging to characterize MeV electronics propagation through plastic targets, article, September 3, 1999; California. (https://digital.library.unt.edu/ark:/67531/metadc623302/m1/6/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.