A high-energy x-ray microscope for inertial confinement fusion

Abstract

We have developed a microscope capable of imaging x-ray emission from inertial confinement fusion targets in the range of 7-9 keV. Imaging is accomplished with a Kirkpatrick-Baez type, four-image microscope coated with a WB4C multilayer having a 2d period of 140 Å. This microscope design (a standard used on the University of Rochester's OMEGA laser system) is capable of 5 μm resolution over a region large enough to image an imploded target (∼400 μm). This design is capable of being extended to ∼40 keV if state-of-the-art, short-spacing, multilayer coatings are used (∼25 Å), and has been configured to obtain 3 μm resolution with the appropriate choice of mirror size. As such, this type of microscope could serve as a platform for multiframe, hard x-ray imaging on the National Ignition Facility. Characterization of the microscope and laboratory measurements of the energy response made with a cw x-ray source will be shown. © 1999 American Institute of Physics.