Refraction-enhanced x-ray radiography for inertial confinement fusion and laser-produced plasma applications

We explore various laser-produced plasma and inertial confinement fusion applications of phase-contrast x-ray radiography, and we show how the main features of these enhancements can be considered from a geometrical optics perspective as refraction enhancements. This perspective simplifies the analysis and often permits simple analytical formulas to be derived that predict the enhancements. We explore a raytrace approach to various material interface applications, and we explore a more general example of refractive bending of x rays by an implosion plasma. We find that refraction-enhanced x-ray radiography of implosions may provide a means to quantify density differences across shock fronts as well as density variations caused by local heating due to high-Z dopants. We also point out that refractive bending by implosions plasmas can blur fine radiograph features and can also provide misleading contrast information on area-backlit pinhole imaging experiments unless its effects are taken into consideration.

[1]  T. Ishikawa,et al.  Zernike phase-contrast X-ray microscope with an X-ray refractive lens , 2003 .

[2]  O. Landen,et al.  The physics basis for ignition using indirect-drive targets on the National Ignition Facility , 2004 .

[3]  Perry M. Bell,et al.  X-Ray Backlighting for the National Ignition Facility , 2000 .

[4]  S. Wilkins,et al.  Contrast and resolution in imaging with a microfocus x-ray source , 1997 .

[5]  B. L. Henke,et al.  X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92 , 1993 .

[6]  J. Koch,et al.  High-resolution tunable spectrograph for x-ray laser linewidth measurements with a plane varied-line-spacing grating. , 1997, Applied optics.

[7]  G. Tromba,et al.  COHERENCE-BASED EDGE DIFFRACTION SHARPENING OF X-RAY IMAGES : A SIMPLE MODEL , 1999 .

[8]  P. Walsh,et al.  Characterization of National Ignitition Facility cryogenic beryllium capsules using x-ray phase contrast imaging , 2004 .

[9]  K. Uesugi,et al.  Sensitive detection of voids in solid materials by refraction-enhanced synchrotron radiation imaging , 2002 .

[10]  J. Lindl.  Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain , 1995 .

[11]  Gilbert W. Collins,et al.  Numerical Raytrace Verification of Optical Diagnostics of Ice Surface Roughness for Inertial Confinement Fusion Experiments , 2003 .

[12]  Peter A. Amendt,et al.  Update on design simulations for NIF ignition targets, and the rollup of all specifications into an error budget , 2007 .

[13]  A. Takeuchi,et al.  Zernike-type X-ray imaging microscopy at 25 keV with Fresnel zone plate optics. , 2002, Journal of synchrotron radiation.

[14]  David A. Hammer,et al.  Phase-contrast x-ray radiography using the X pinch radiation , 2001, SPIE Optics + Photonics.

[15]  S. Wang,et al.  Fresnel number of a regular polygon and slit. , 2000, Applied optics.

[16]  Kamel Fezzaa,et al.  Quantitative characterization of inertial confinement fusion capsules using phase contrast enhanced x-ray imaging , 2005 .

[17]  J. Koch.  Compact high-resolution soft-x-ray spectrograph design using two matched grazing-incidence gratings. , 1995, Applied optics.

[18]  O. Landen,et al.  Development of a Laser-Produced Plasma X-Ray Source for Phase-Contrast Radiography of D-T Ice Layers , 2009 .

[19]  Jeffrey A. Koch,et al.  High-energy Kα radiography using high-intensity, short-pulse lasersa) , 2006 .

[20]  K. Nugent,et al.  Phase measurement using x rays (invited) , 2004 .

[21]  D. K. Bradley,et al.  10 and 5 μm pinhole-assisted point-projection backlit imaging for the National Ignition Facility , 2001 .

[22]  C. Sorce,et al.  Very-high-growth-factor planar ablative Rayleigh-Taylor experimentsa) , 2006 .

[23]  Benchmarking X-Ray Phase Contrast Imaging for ICF D-T Ice Characterization Using Roughened Surrogates , 2008 .

[24]  Emil Wolf,et al.  Principles of Optics: Contents , 1999 .

[25]  L. J. Atherton,et al.  Single crystal growth and formation of defects in deuterium-tritium layers for inertial confinement nuclear fusion , 2009 .

[26]  J. Koch,et al.  Effective-focal-length calculations and measurements for a radial diffraction grating , 1999 .

[27]  James R. Fincke,et al.  Development of intense point x-ray sources for backlighting high energy density experiments (invited) , 2004 .

[28]  Jay D. Salmonson,et al.  Simulations of high-mode Rayleigh-Taylor growth in NIF ignition capsules , 2007 .

[29]  F. Zernike.  Phase contrast, a new method for the microscopic observation of transparent objects , 1942 .

[30]  J. Kilkenny,et al.  Large growth, planar Rayleigh–Taylor experiments on Nova , 1992 .

[31]  A. Barty,et al.  Validation of radiographic simulation codes including x-ray phase effects for millimeter-size objects with micrometer structures. , 2007, Journal of the Optical Society of America. A, Optics, image science, and vision.

[32]  E. Bernabeu,et al.  Unified and generalized Fresnel numbers , 1992 .

[33]  Jeffrey A. Koch,et al.  Quantitative Analysis of Backlit Shadowgraphy as a Diagnostic of Hydrogen Ice Surface Quality in ICF Capsules , 2000 .