Demonstration of an x-ray ring-aperture microscope for inertial-confinement fusion experiments

Journal Article · Mon Jan 27 00:00:00 EST 1992 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.106673· OSTI ID:5068892

Ress, D; Lerche, R A; Da Silva, L ^[1]

---

1. Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94550 (United States)

We are investigating the use of annular (ring) apertures to image high-energy x-ray emission ({gt}4 keV) from inertial-confinement fusion targets. In our scheme, a coded image is formed on a detector (such as x-ray film) by x rays that pass through a narrow annulus cut in a sheet of high-Z material such as gold. Signal-to-noise ratio calculations show a factor of 10 advantage of ring-aperture imaging over conventional pinhole imaging. Simultaneous pinhole and ring-aperture images of small ({approx}20 {mu}m diam), laser-driven, x-ray sources were obtained in recent experiments. We used a 10-{mu}m-wide, 1-mm-diam annulus in a 6-{mu}m thickness of gold; a 10-{mu}m-diam pinhole was in the center of the annulus. Unfolds of the coded images have signal-to-noise ratios a factor of 20 larger than the pinhole images. The ring-aperture microscope is a promising new technique to image inertial-confinement fusion targets and other compact sources of high-energy x rays.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5068892
• Journal Information: Applied Physics Letters; (United States), Vol. 60:4; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
47 OTHER INSTRUMENTATION
PLASMA DIAGNOSTICS
X-RAY DETECTION
X-RAY RADIOGRAPHY
SPATIAL RESOLUTION
IMAGE CONVERTERS
INERTIAL CONFINEMENT
MODIFICATIONS
RINGS
SIGNAL-TO-NOISE RATIO
CONFINEMENT
DETECTION
IMAGE TUBES
INDUSTRIAL RADIOGRAPHY
PLASMA CONFINEMENT
RADIATION DETECTION
RESOLUTION
700320* - Plasma Diagnostic Techniques & Instrumentation- (1992-)
440600 - Optical Instrumentation- (1990-)