A5103064389- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Advanced Surface Polishing Techniques
- Ion-surface interactions and analysis
- Advanced Electron Microscopy Techniques and Applications
- Advancements in Photolithography Techniques
- Magnetic Properties and Applications
- Nuclear Physics and Applications
- GNSS positioning and interference
- Astronomical Observations and Instrumentation
- Optical Systems and Laser Technology
- Magnetic properties of thin films
- Diamond and Carbon-based Materials Research
- Laser Material Processing Techniques
- Calibration and Measurement Techniques
- Optical Coatings and Gratings
- Astrophysical Phenomena and Observations
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray and CT Imaging
- Crystallography and Radiation Phenomena
Tongji University
2013-2024
Tsinghua University
2020
The Hot Universe Baryon Surveyor (HUBS) mission is proposed to study "missing" baryons in the universe. Unlike dark matter, baryonic matter made of elements periodic table, and can be directly observed through electromagnetic signals that it produces. Stars contain only a tiny fraction known present Additional are found diffuse (gaseous) form, or between galaxies, but significant has not yet been seen. latter (missing baryons) thought hiding low-density warm-hot ionized medium (WHIM), based...
Abstract The measurement of X-ray continuous emission from laser-driven plasma was achieved through multiple monochromatic imaging utilizing a multilayer mirror array. This methodology exemplified by the development an eight-channel system, capable operating in energy range several keV with spatial resolution approximately 3 μm. By integrating this system streak camera, temperature and trajectory imploding capsules were successfully measured at kJ-class Shenguang III prototype laser...
Abstract Nanoscale Ru/C multilayers are essential reflective optics in the hard x-ray region of 7–20 keV. To understand layer growth behavior and develop ultrathin multilayer mirrors with periods smaller than 3.0 nm, different 6.2–1.5 nm were fabricated studied. It is found that average interface width started to increase obviously when period became 2.5 while surface roughness remained almost same. The intrinsic stress gradually decreased decreasing reached a very low value −82 MPa at d =...
Multiple monochromatic x-ray imaging (MMI) is a technique for diagnosing the emission spectra of tracer elements in laser-driven inertial confinement fusion experiments. This study proposes an MMI method that combines simple pinhole array with laterally graded multilayer mirror. The directly obtains multiple images by regulating thickness different mirror positions to compensate energy-broadening effect. paper presents comprehensive design scheme, fabrication and experimental verification...
A multispectral extreme ultraviolet imaging system based on a separated multichannel Schwarzschild objective was developed for emission measurements of tokamak plasma, with wide field view, high spatial resolution, and resolution. Multiple energy responses were realized by depositing different multilayer coatings each mirror, targeting the interesting spectral lines common impurities, such as Ne, C, W, observed in experiments. Direct-current magnetron sputtering conjunction mask reshaping...
Curved crystal imaging is an important means of plasma diagnosis. Due to the short wavelengths high-energy X rays and fixed lattice constant spherical crystal, it difficult apply in X-ray imaging. In this study, we have developed a high-energy, high-resolution imager based on toroidal that can effectively correct astigmatism. We prepared Ge 〈5 1 1〉 for backlighting Mo Kα1 characteristic lines (∼17.48 keV) verified its ability region, achieving spatial resolution 5–10 µm field view larger than 1.0 mm.
Abstract High-resolution X-ray flash radiography of Ti characteristic lines with a multilayer Kirkpatrick–Baez microscope was developed on the Shenguang-II (SG-II) Update laser facility. The uses an optimized design Co/C and W/C stacks to obtain high reflection efficiency while meeting precise alignment requirement at Cu Kα line. method based dual simulated balls proposed herein, which simultaneously realizes accurate indication center field view backlighter position. optical design,...
A simultaneous high-resolution x-ray backlighting and self-emission imaging method for laser-produced plasma diagnostics is developed in which two Kirkpatrick–Baez channels high-energy low-energy are constructed using a combination of multilayer mirrors near-coaxial form. By streak or framing camera placed on the image plane, both backlit images with high spatial temporal resolution can be obtained simultaneously single shot. This paper describes details regard to its optical design,...
High-resolution x-ray imaging diagnostics play a crucial role in fundamental research, such as inertial confinement fusion (ICF) and high-energy density physics (HEDP). Plasma signals are typically characterized by small scales, rapid evolution, spectral complexity. These characteristics make it essential to develop optics with high spatial resolution, collection efficiency, resolution. requirements can be met using combination of high-resolution multi-channel Kirkpatrick–Baez (KB)...
Here, we developed a high-resolution, dual-channel toroidal-crystal x-ray imager for time-framed backlit imaging diagnostics using the 4.727 keV helium-like Ti line. We also presented method adjusting through self-imaging of two-dimensional periodic object. Offline experiments achieved spatial resolution ∼5.0 μm in center and better than 8.0 within field view (FOV) ∼2 mm. At ShenGuang-III prototype laser facility, obtained results with 5 an FOV ±40 µm. This thus provides way observing high...
Multi-channel Kirkpatrick–Baez (KB) microscopes, which have better resolution and collection efficiency than pinhole cameras, been widely used in laser inertial confinement fusion to diagnose time evolution of the target implosion. In this study, a tandem multi-channel KB microscope was developed sixteen imaging channels with precise control spatial image intervals. This created using coarse assembly mirror pairs high-accuracy optical prisms, followed by adjustment real-time x-ray...
For investigating extreme ultraviolet (EUV) damage on optics, a table-top EUV focusing optical system was developed in the laboratory. Based modified Schwarzschild objective with large numerical aperture and laser-plasma light source, this can generate spot maximum energy density of 2.27 J/cm2 at focal plane wavelength 13.5 nm. The structures characterized properties are presented paper. testing performance setup, single-shot tests were carried out an substrate CaF2 gold thin film....
Because grazing–incidence Kirkpatrick–Baez (KB) microscopes have better resolution and collection efficiency than pinhole cameras, they been widely used for x-ray imaging diagnostics of laser inertial confinement fusion. The assembly adjustment a multichannel KB microscope must meet stringent requirements image reproducible alignment. In the present study, an eight-channel was developed by self-emission x-rays with framing camera at Shenguang-II Update (SGII-Update) facility. A consistent...
A four-channel multilayer Kirkpatrick-Baez (KB) microscope is developed for the 8-keV X-ray imaging of experiments on laser inertial confinement fusion (ICF).A periodic that works at 8 keV and with a grazing incidence angle 1.0 • coated reflective surfaces to achieve spatial resolution higher than 5 µm an effective solid ∼10 -7 sr.A precise assembly realized by conical reference cone couple framing camera.This study provides detailed information optical design, method, experimental results...
In this work, a masking technique was used to improve the thickness uniformity of Mo/Si multilayer deposited on curved spherical mirror by direct current (DC) magnetron sputtering with planetary rotation stages. The clear aperture 125 mm radius curvature equal 143.82 mm. Two different shadow masks were prepared; one flat and other oblique. When using mask, non-uniformity considerably increased owing relatively large gap between mask substrate. deviation designed measured layer gradually...
A time-resolved multispectral X-ray imaging approach with new version of multi-channel Kirkpatrick-Baez (KB) microscope is developed for laser plasma diagnostics at the kilojoule-class Shenguang-II facility (SG-II).The uses a total external reflection mirror in sagittal direction and an array multilayer mirrors tangential to obtain multiple individual high-resolution, highthroughput, quasi-monochromatic images.The time evolution imploded target energy bands can be acquired when coupled...
Lithium fluoride (LiF) crystal is a radiation sensitive material widely used as EUV and soft x-ray detector. The LiF-based detector has high resolution, in principle limited by the point defect size, large field of view, wide dynamic range. Using LiF an imaging detector, resolution 900 nm was achieved projection test meshes with Schwarzschild objective operating at 13.5 nm. In addition, pinhole illuminated plasma, spot 1.5 μm diameter image plane generated, which accomplished direct writing...
A large-field high-resolution x-ray microscope was developed for multi-keV time-resolved imaging diagnostics of laser plasma at the Shenguang-III prototype facility. The consists Kirkpatrick–Baez amélioré (KBA) bimirrors and a KB single mirror corresponding to temporal directions streak camera, respectively. KBA coated with an Ir layer were used obtain high spatial resolutions within millimeter-range field view, Cr/C multilayers specific spectral resolution around 4.3 keV. This study...
Montel mirror coated by laterally graded multilayer is a key two-dimensional collimating optics for x-ray analysis instrument. To provide guidance the fabrication, collimation property of W/Si with parabolic shape simulated systematically ray-tracing program. The influence different source sizes, reflection bandwidth, mirror-detector distance, figure errors, and assembly errors on performance simulated. mechanism change divergence angle, efficiency, beam uniformity, so analyzed. Based...
Monochromatic energy multilayer Kirkpatrick-Baez microscope is one of key diagnostic tools for researches on inertial confinement fusion. It composed by two orthogonal concave spherical mirrors with small curvature and aperture, produce the image an object collecting X-rays in each direction, independently. Accurate measurement radius very important to achieve its design optical properties including imaging quality, throughput resolution. However, it difficult measure surfaces aperture...
The degradation of image quality the nested conical Wolter-I X-ray telescope mainly results from mirror-position tolerance, alignment-bar tolerance and surface-figure tolerance. analytical approach three kinds was presented in this paper. Based on predetermined initial structure, we analyzed compared qualities with different tolerances. Furthermore, simulated distribution spot diagrams calculated spatial resolution entire system. Shift along optical axis (Z axis) rotation around it have no...
A four-channel Kirkpatrick-Baez microscope working at multiple energy bands is developed for multiframe X-ray imaging diagnostics the Shenguang-II laser facility.The response to realized by coating double-periodic multilayers on reflected surfaces of microscope.Because limited size microstrips in framing camera, image separation controlled conical angle reference cores during assembly.This study describes optical and multilayer design, assembly, alignment microscope.The achieves a spatial...