The multi-channel Kirkpatrick-Baez microscope (KBM), currently in use at the National Ignition Facility (NIF), uses grazing incidence multilayer crystals to focus x-rays to form an image. This diagnostic produces four images with a ~11x magnification, with a designed energy response of 10.2 ±1.5 keV at <10 μm resolution over a 300 μm x 300 μm field of view. The KBM has been designed to image the imploded core of inertial confinement fusion (ICF) experiments, which have diameters ranging over 50-100 μm and broadband emission. The self-emission spectrum is broadband and peaked at ~10 keV.
We present a new calibration of the KBM using a molybdenum (W, Z = 42) x-ray microfocus source to measure the spectral response of the instrument over its field of view. Our results measure the variation and dependence on the coalignment of the four imaging channels, relating the region of best resolution and optimal spectral response.
Within the framework of its researches on Inertial Confinement Fusion (ICF), the “Commissariat à l’Énergie Atomique et aux Énergies Alternatives” (CEA) studies and designs advanced X-ray diagnostics in order to probe dense plasmas produced by Laser facilities. The final goal for those diagnostics is to be used during experiments on the Laser Megajoules french facility (LMJ) at Bordeaux.
We present two types of advanced monochromatic High Resolution X-ray Imaging microscopes (HRXI) who have high spatial resolution capability (3-6 μm) and high efficiency.
The first microscope so-called MERSSIX consists of two toroïdals mirrors mounted into a Wolter type geometry and working at grazing incidence. Non-periodic multilayer (depth graded) mirrors were developed with special coatings designed to provide broadband X-ray reflectance in the 1 - 22 keV energy range. Associated to this Wolter microscope a potential monochromatic third mirror coated with a multilayer stack can be used for monochromatic application in that range.
The second microscope is composed of a transmission gold Fresnel Phase Zone Plate (FPZP) and a narrow bandwidth multilayer mirror. We present an experimental study with X-ray plasma-source and a complete characterization of the X-ray optics on the synchrotron radiation facility BESSY II.
Potentialities (a few μspatial resolution monochromatic images) and complementarity of these two monochromatic HRXI are discussed. The design of the MLs for each microscope is detailed.