Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Development of backlighting sources for Compton radiography diagnostic of Inertial Confinement Fusion targets.



Lawrence T. Hudson, A. Tommasini, A MacPhee, D. Hey, T Ma, C. Chen, N Izimi, W Unites, A. MacKinnon, P. Hatchett, B.A. Remington, H.S. Park, P. Springer, J. Koch, O.L. Landen, John F. Seely, G Holland


We present scaled demonstrations of backlighter sources, emitting Bremsstrahlung x rays with photon energies above 75 keV, that we will use to record x-ray Compton radiographic snapshots of cold dense DT fuel in inertial confinement fusion implosions at the National Ignition Facility (NIF). In experiments performed at the Titan laser facility at Lawrence Livermore National Laboratory, we measured the source size and the Bremsstrahlung spectrum as a function of laser intensity and pulse length from solid targets irradiated at 2e17 W/cm2 to 5e18 W/cm2 using 2 ps to 40 ps pulses. Using Au planar foils we achieved source sizes down to 5.5 µm, and conversion efficiencies of about 1e-3 J/J into x-ray photons with energies in the 75 keV to 100 keV spectral range. We can now use these results to design NIF backlighter targets and shielding, and to predict Compton radiography performance as a function of the NIF implosion yield and associated background.
Review of Scientific Instruments


laser-plasma interaction, hard x rays, x-ray spectroscopy, radiography


Hudson, L. , Tommasini, A. , MacPhee, A. , Hey, D. , Ma, T. , Chen, C. , Izimi, N. , Unites, W. , MacKinnon, A. , Hatchett, P. , Remington, B. , Park, H. , Springer, P. , Koch, J. , Landen, O. , Seely, J. and Holland, G. (2008), Development of backlighting sources for Compton radiography diagnostic of Inertial Confinement Fusion targets., Review of Scientific Instruments, [online], (Accessed July 23, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created December 8, 2008, Updated February 19, 2017