A5079030812- Advanced X-ray Imaging Techniques
- Advanced Surface Polishing Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-Plasma Interactions and Diagnostics
- Optical Systems and Laser Technology
- Advancements in Photolithography Techniques
- Advanced Electron Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Diamond and Carbon-based Materials Research
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- Adaptive optics and wavefront sensing
- Particle accelerators and beam dynamics
- Crystallography and Radiation Phenomena
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Surface Roughness and Optical Measurements
- Geophysics and Gravity Measurements
- Muon and positron interactions and applications
- Electrodeposition and Electroless Coatings
- Innovations in Concrete and Construction Materials
- Anodic Oxide Films and Nanostructures
- Neutrino Physics Research
Optica
2022
The University of Tokyo
2013-2020
Japan Science and Technology Agency
2020
Japan Synchrotron Radiation Research Institute
2020
Japan Proton Accelerator Research Complex
2017
High Energy Accelerator Research Organization
2006
In X-ray focusing, grazing incidence mirrors offer advantages of no chromatic aberration and high focusing efficiency. Although nanofocusing have been developed for the hard region, there is mirror with performance in soft region. Designing a system ability to focus beam size smaller than 100 nm at an energy less 1 keV requires numerical aperture larger 0.01. This leads difficulties fabrication accuracy. Ellipsoidal enable aperture. this study, we report production process ellipsoidal...
An x-ray ellipsoidal mirror is an ideal tool for focusing soft x-rays. Because nanometer-level shape accuracy required in the internal surface of a having small diameter, it difficult to fabricate by processing directly. We developed fabrication process mirrors which high-precision quartz mandrel with inverted designed replicated nickel sulfamate electroforming. In this study, 40-mm length was fabricated and evaluated measurement method using contact probe. The root mean square (RMS)...
We demonstrate broadband focusing of multiple high-order harmonics intense femtosecond laser pulses using an ellipsoidal mirror. The mirror, with a high numerical aperture and highly accurate surface, was fabricated replication process. in the wavelength range between 10 20 nm were focused to nearly diffraction-limited size 350 × 380 nm2. According Rayleigh's quarter criteria, wavefront aberration beam estimated be less than 5 nm, which corresponds temporal dispersion 16 as. developed system...
Intense sub-micrometre focusing of a soft X-ray free-electron laser (FEL) was achieved by using an ellipsoidal mirror with high numerical aperture. A hybrid system in combination Kirkpatrick–Baez applied for compensation small spatial acceptance the mirror. With this system, FEL pulses were focused down to 480 nm × 680 extremely intensity 8.8×10 16 W cm −2 at photon energy 120 eV, which yielded saturable absorption L -edge Si (99.8 eV) drastic increase transmittance from 8% 48%.
Ellipsoidal mirrors are promising optical devices for soft x-ray focusing. A fabrication process consisting of master and replication has been developed to produce ellipsoidal with wide apertures approximately 10 mm. In the present study, focusing performance an mirror was evaluated using x-rays in beamline BL25SU-a SPring-8. The focus sizes were measured at photon energies 300, 400, 500 eV. quantitative figure error also by analyzing wavefield focused beam retrieved ptychography....
A soft X-ray ptychography system using a Wolter mirror for the illumination optics has been developed. By taking advantage of achromaticity optics, is capable seamlessly imaging at half-period resolution 50 nm with broad photon-energy range from 250 eV to 2 keV while maintaining focal position. Imaging mammalian cell various wavelengths was demonstrated, and high-resolution visualization organelle achieved. Stereo also performed long working distance 20 mm. In combination in-situ/operando...
During the past five years, there has been an concerted program at SLAC and KEK to develop accelerator structures that meet high gradient (65 MV/m) performance requirements for Next Linear Collider (NLC) Global (GLC) initiatives. The design resulted is a 60-cm-long, traveling-wave structure with low group velocity 150 degree per cell phase advance. It average iris size produces acceptable short-range wakefield, dipole mode damping detuning adequately suppresses long-range wakefield. More...
The monolithic Wolter mirror is an ideal optical device for focusing soft x rays to a submicron-sized spot, with the advantages of high efficiency, large acceptance, achromaticity, and robustness alignment error. fabrication process this type has not been established because difficulty in highly accurate figure measurement free-form surfaces small radii curvature steep profiles. In study, we employed tactile scanning surface characterization fabricate high-precision mirror. First, it was...
Ellipsoidal mirrors are one of the most promising types X-ray mirror, because mirror can focus X-rays to nanometer size with a large aperture and no chromatic aberration. However, so far ideal ellipsoidal cannot be realized by any manufacturing methods. One reasons is there fabrication method process their inside surface diameter several millimeters nanometer-level accuracy. We propose develop mirror. First, master which has reversed shape prepared using grinding, polishing Elastic Emission...
We have developed a focusing system for extreme ultraviolet light produced by high-order harmonic generation. An ellipsoidal mirror with precise surface shape was fabricated and installed into the system. A rigid manipulator beam profiler were employed to perform stable alignment. As demonstration of performance, harmonics in wavelength range 13.5–19.5 nm successfully focused 2.4 × 2.3 μm2 spot.
We developed a full-field microscope with twin Wolter mirrors for soft X-ray free-electron lasers. The condenser and an objective were fabricated using electroforming process precisely figured master mandrel. In the imaging system constructed at SACLA BL1, sub-micrometer spatial resolution was achieved wavelengths of 10.3 3.4 nm. Single-shot bright-field images acquired maximum illumination intensity 7×1014 W/cm2.
Electroforming is a replication technique based on the Ni electrodeposition of metal master surface. Generally, residual stress in deposited layer has been considered to be main reason for deformation replicated product. In this paper, influence accuracy discussed electroforming rotationally symmetric shape. The circumferential direction product was investigated quantitatively by finite-element calculations material mechanics, considering measured an electrodeposited nickel experiment, shape...
This study presents an approach for fabricating Wolter type-I mirrors x-ray telescopes using a nickel electroforming replication process with quartz glass mandrels. The proposed method addresses the challenges encountered in conventional fabrication techniques, which involve electroless nickel-coated aluminum mandrels that are susceptible to corrosion and thermal deformation. Quartz offer excellent chemical, thermal, mechanical stability, enabling efficient production of high-performance...
The focusing of x rays is essential in various types x-ray microscopy because the size and flux illuminating beam determine spatial resolution signal intensity, respectively. A system with grazing incidence mirrors allows highly efficient ray dimensions on nanometer scale. Tube-shaped a large numerical aperture high demagnification, including ellipsoidal Wolter mirrors, have recently been developed for soft nanofocusing. However, these low efficiency they cannot focus central part...
An achromatic soft x-ray imaging system based on a transmission microscope equipped with pair of Wolter mirrors was constructed. The two for the condenser and objective were fabricated precisely by using an electroforming replication process. samples illuminated broadband high harmonic pulses in wavelength range 26 nm to 35 via mirror, bright-field images without chromatic aberration formed mirror. A single-shot image femtosecond laser pulse recorded at spatial resolution about 200 nm....
We developed a copper electroforming replication (CER) process to fabricate precise ellipsoidal mirrors for soft x-ray focusing. Some applications of in microscopy require that all components are close samples, including the mirrors, made non-magnetic materials. In this study, mirror was fabricated by replicating figured and super-polished quartz glass mandrel using an technique. It found CER has high accuracy 8 nm. The focusing performance characterized free-electron laser with photon...
This paper introduces a new approach to measure the muon magnetic moment anomaly $a_{\mu} = (g-2)/2$, and electric dipole (EDM) $d_{\mu}$ at J-PARC facility. The goal of our experiment is $a_{\mu}$ using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing $g-2$ experiments unprecedented quality storage field. Additional significant differences from present experimental include 1,000 transverse emittance beam (reaccelerated...
Electroforming is a major replication method for producing precise and complicated shapes. In industry, optical components molds are produced by the electroforming process long time. Recently, this has also been used in MEMS fields mass production of nanometer pattern. study, we focus on electrodeposition condition to increase accuracy. order remove influence thermal deformation from accuracy, Ni under room temperature employed. The optimized viewpoint internal stress. Then developed system...
Mirrors are key devices for creating various systems in optics. Focusing X-ray and extreme ultraviolet (EUV) light requires mirror surfaces with an extremely high accuracy. The figure of ellipsoidal is obtained by rotating elliptical profile, using such a mirror, soft EUV can be focused to dimensions on the order nanometers without chromatic aberration. Although theoretical performance mirrors high, fabrication ideal remains problematic. Based this background, we have been working develop...
An X-ray ellipsoidal mirror requires nanometer-level shape accuracy for its internal surface. Owing to the difficulty in processing surface, electroforming using a high precision master mandrel has been applied fabrication. In order investigate replication of electroforming, measurement method entire surface must be developed. The purpose this study is evaluate electroforming. study, three-dimensional apparatus an composed laser probes, contact probe, reference flats, z-axis stage, and...
The muon anomalous magnetic moment (g - 2) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">μ</sub> and electric dipole (EDM) are sensitive to new physics beyond the Standard Model. We aim measure with a precision of 0.1 parts per million search for EDM sensitivity 10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">-21</sup> e·cm at J-PARC. In this experiment, we use silicon strip detector high granularity fast response detect positrons from...
Ellipsoidal mirrors are ideal focusing optics for soft x-rays because of advantages that include high numerical aperture, efficiency, and no chromatic aberrations. Shape accuracy nanometer order is required on the internal surface a mirror with diameter around 10 mm. Because difficulty processing surface, ellipsoidal fabricated by replication shapes master mandrels. In previous studies, fabrication process was developed x-ray involving mandrel nickel electroforming. 40-mm-long were focused...
The performance of an in situ internal stress measurement technique using a Shack-Hartmann sensor (SHS) is examined during nickel electrodeposition concentrated sulfamate solution. calculated from the change curvature test plate bent by stress. measured monitoring wavefront expanded laser beam reflected at substrate SHS. Applying proposed method, measurements were conducted and repeatability accuracy estimated. In with current density 2.1 mA/cm2 revealed approximately 1 MPa when thickness...