The synthesis and deposition of nanoparticles consisting of Cu and Au in a CuSO<sub>4</sub> solution with some kinds of alcohol and electroplating solution containing gold (I) trisodium disulphite under synchrotron X-ray radiation was investigated. The functional group of alcohol plays an important in nucleation, growth and aggregation process of copper and cupric oxide particles. We found that the laboratory X-ray source also enables us to synthesize the NPs from the metallic solution. As increasing X-ray exposure time, the full length at half width of particle size distribution is broader and higher-order nanostructure containing NPs clusters is formed. The surface-enhanced Raman scattering (SERS) of 4, 4'-bipyridine (4bpy) in aqueous solution was measured using higher-order nanostructure immobilized on silicon substrates under systematically-varied X-ray exposure. This demonstration provide a clue to develop a three-dimensional printing and sensor for environmental analyses and molecular detection through simple SERS measurements.
A Four-stage X-ray Telescope (FXT) has been developed as the best-fit optics for the Diffuse Intergalactic Oxygen Surveyor (DIOS) mission, a small satellite mission for mapping observations of the warm-hot intergalactic medium. The FXT mirrors are based on a conical approximation of the Wolter-I design, fabrication technique used in the Suzaku satellite. We made the second FXT demonstration model, in which we installed 4 sets of 4 stage mirrors with diameter of about 500 mm using alignment plate. Both optical and X-ray measurement were done to estimate FXT performance. Although angular resolution is two to three times worse than that of the requirement and the goal, the field of view and the effective area are consistent with expected performance derived by the ray tracing simulation.
A Four-stage X-ray Telescope (FXT) has been developed as the best-fit optics for the Diffuse Intergalactic Oxygen Surveyor (DIOS) mission, a small satellite mission for mapping observations of the warm-hot intergalactic medium. The FXT mirrors are based on a conical approximation of the Wolter-I design, fabrication technique used in the Suzaku satellite. We developed processes for fabricating a large-diameter (≥ 50 cm) foil mirror and made a new full size quadrant housing 60 cm in diameter with four-stage integrated alignment plates. We made optical measurement using one set of four-stage mirrors over than diameter of more than 50 cm.
To search for warm-hot intergalactic medium (WHIM), a small satellite mission DIOS (Diffuse Intergalactic Oxygen Surveyer ) is planned and a specially designed four-reflection X-ray telescope (FXT) has been developed as the best fit optics to have a wide field of view and a large effective area. Based on the design of optics and mirror fabrication method developed for FXT, we made the quadrant model with ten nested four-stage mirrors. We describe the expected and the measured performance of this system.
A small satellite mission DIOS (Diffuse Intergalactic Oxygen Surveyor ) is planned to observe the warm-hot
intergalactic medium ( WHIM ) of a few millions of degree, by mapping the redshifted emission lines of oxygen.
FXT( Four Stage X-ray Telescope) has been developed as the best fit optics for DIOS. The X-ray measurement
of the first demonstration model showed a few time larger angular resolution than designed value and compact
optical measurement systems for each stage single mirror were made to clarify the reason of worse performance.
We will report on the present status of the development of FXT including compact optical measurement system
and reexamination of the process of replica foil mirror fabrication.
To search for warm-hot intergalactic medium (WHIM), a small satellite mission DIOS (Diffuse Intergalactic
Oxygen Surveyor ) is planned and a specially designed four-stage X-ray telescope (FXT) has been developed
as the best fit optics to have a wide field of view and large effective area. Based on the previous design work
and mirror fabrication technology used in the Suzaku mission, we made small demonstration model of DIOS
FXT. This model has focal length of 700 mm consisting of quadrant housing and four-stage mirror sets with
different radii of 150 - 180 mm and each stage mirror hight of 40 mm. We performed X-ray measurement for
one set of four-stage mirror with a radius of 180 mm. From the results of the optical and X-ray measurement,
it was found that tighter control were required for positioning and fabrication process of each mirror even to get
angular resolution of several arcmin.
We present the current status of a small X-ray mission DIOS (Diffuse Intergalactic Oxygen Surveyor), consisting
of a 4-stage X-ray telescope and an array of TES microcalorimeters, cooled with mechanical coolers, with a total
weight of about 400 kg. The mission will perform survey observations of warm-hot intergalactic medium using
OVII and OVIII emission lines, with the energy coverage up to 1.5 keV. The wide field of view of about 50'
diameter, superior energy resolution close to 2 eV FWHM, and very low background will together enable us a
wide range of science for diffuse X-ray sources. We briefly describe the current status of the development of the
satellite, and the subsystems.