Faraday rotation and optical absorption of a single crystal bismuth-substituted gadolinium iron garnet were measured in the near-infrared region. In spite remarkable increase by bismuth substitution, no appreciable coefficient was observed this wavelength

A 100-MHz ultrasonic linear transducer array made from a piezoelectric zinc oxide thin film on sapphire substrate was developed and evaluated. Epitaxial, high-acoustic quality 10-/spl mu/m-thick ZnO layers were produced by rf-magnetron sputter deposition onto (111)-oriented gold (with chromium adhesion layer) that vacuum-evaporated (0001) surface. We found that, in well-oriented growth of gold, it is important to control the sublayer thickness (less than 5 nm). An constructed...

Anomalous Faraday rotations of the following three series polycrystalline garnets weremeasured; 1) Gd3-xBixFe5O12, 2) Gd2Bi1Fe5-yGayO12 and Gd2Bi1Fe5-yInyO12, 3) Y2.25Bi0.75Fe5-yGayO12 Y2.25Bi0.75Fe5-yScyO12. In 1 2, were measured in visible region at room tentperature. The rotation increased linearly with x up to x=1.4, magneto-optical figure merit reached 23 deg (at 0.56 µm) Gd2Bi1Fe5O12. It was found 2 that further substitution Ga for Fe y=1.0 slightly decreased merit. 3, near infrared a...

Absolutely calibrated measurements of the neutron yield are important for evaluation plasma performance such as fusion gain Q in D–D operating tokamaks. The time-resolved is measured with 235U and 238U fission chambers 3He proportional counters JT-60U tokamak. situ calibration was performed by moving 252Cf source toroidally through JT-60 vacuum vessel. Detection efficiencies three two detectors were 92 locations point toroidal scans at different major radii. total detection efficiency torus...

Through seeded lateral overgrowth, c-axis oriented PbTiO3 films are formed on patterned Pt electrode that a SrTiO3 single crystal. The impedance characteristics then measured for this sample as if it were composite bulk wave resonator. A series of resonance and antiresonance is observed. Using conventional circuit model, the electrical analyzed to evaluate electromechanical coupling constant kt films. It found large 0.8.

Lead titanate PbTiO3 ceramics with a zero temperature coefficient of surface wave delay time are developed by addition Nd2O3, In2O3, and MnO2. These have very small coefficients less than 1 ppm/ °C over wide range (−10–+60 °C). They large electromechanical coupling factor low dielectric constant. The propagation loss is 4 dB/cm at 57 MHz. modified high potential for use in applications, e.g., filters.

低レベル放射性廃棄物のうち,比較的放射能濃度が高いものは,地表から深さ70 m以上の地下の廃棄物埋設地に埋設すること(以下,"中深度処分"という)が計画されており,その新規制基準は2014年の検討開始から7年を経て2021年10月に制定された。この間,日本原子力学会では2008年に制定していた余裕深度処分の安全評価手法標準の改定に取り組み,2023年に発行した。本報告は,日本原子力学会2024年春の年会の企画セッションにおいて紹介した中深度処分施設の安全評価の実施方法に関する改定標準(本報告では2023年改定の"AESJ-SC-F012:2023"を示す)の概要を説明する。

Ultra-light dark matter candidates, such as axions and photons, particularly within the mass range of $\mu$eV to meV, have garnered significant research interest. However, effectiveness existing experiments is often hindered by narrow bandwidths conventional spectrometers. This study presents a novel spectrometer solution based on RFSoC, which integrates high-speed data converter, field programmable gate array (FPGA), CPU single chip. The spectrometer's logic implements an optimized fast...

Abstract Ultra-light dark matter candidates, such as axions and photons, particularly within the mass range of μeV to meV, have garnered significant research interest. Detection approaches dish-antenna method benefit from broadband spectrometers, allowing for efficient scanning across a broad range. This study presents novel spectrometer solution based on an RFSoC. The spectrometer’s programmable logic implements optimized fast Fourier transform (FFT) that minimizes memory usage, enabling...

Experiments have been carried out in JT-60U to verify the modelling of fast ion ripple transport. The induced loss was estimated from neutron decay following neutral beam pulse injection and related heat load on first wall. Comparison lost fraction hot spot positions between measurements orbit Monte Carlo calculations exhibited good agreement, indicating that transport governing losses is explained within framework existing theory. Neutral heating experiments also indicate H modes free ELMs...

Translucent scintillator ceramics of Gd 2 O S:Pr, Ce, F were fabricated using a hot isostatic pressing (HIP) technique. The optical transmission is about 60% the incident light and X-ray stopping power also quite high. Owing to enhancement these properties by HIP densification process, highest output from 1 mm thick specimen combined with silicon photodiode, when excited 120 kV X-rays, has reached 1.8 times that CdWO 4 single crystals. present are very promising candidates for materials in...

The surface acoustic wave (SAW) and piezoelectric properties of PbTi03 ceramics modified by the partial substitution rare earths for Pb, particularly (Pb, Ln) (Ti, Mn)03 (Ln = La, Ce, Pr, Nd, Sm, or Gd) ceramics, are examined. effects introduced on these noted. Properties, such as velocities electromechanical coupling factors, bulk SAW vary monotonically with ionic sizes earths. On other hand, temperature coefficient delay time takes a minimum value when Ln is Nd. It shown that variation...

Decay spectra during the rf heating were identified as parametric decay into cold lower-hybrid waves and ion-cyclotron at plasma surface. The instabilities absorbed some fraction of power, hence they affected heating. However, did not prevent penetration lower hybrid wave to center. Drastic reduction was obtained when resonant condition destroyed.

Toroidal field ripple loss of neutral-beam-injected fast ions is measured from the heat load on first wall in JT-60U. The localized both toroidal and poloidal directions increases with size safety factor. overall good agreement an orbit-following Monte Carlo calculation. Nevertheless, there a small difference between experimental calculated location maximum load, which suggests that radial electric shifts impinging points ripple-trapped wall.

The influence of growth conditions on rf-magnetron sputtered lead zirconate titanate (or PZT) thin films has been investigated, and the structural electrical properties PZT have examined. It was found that Pb content in a film is proportional to rf power, thereby making it possible control composition precisely. A well-crystallized perovskite structure obtained by postdeposition annealing at 590°C. stoichiometric (i.e., Pb/Zr+Ti=1) had dielectric constant value 1180.

The absolute efficiencies of a microchannel-plate detector for He + and 0 were measured in the energy range 1 to 10 keV. There was no difference between incidences regarding efficiency, efficiency constant above range. This value indicates that almost all particles hitting entrance wall MCP pores detected.

Two types of piezoelectric ceramics with large electromechanical anisotropies (planar coupling factor k p is much less than thickness dilatational t ) have been developed for use as high-frequency ultrasonic transducer materials: modified lead titanate (Pb, Sm)(Ti, Mn)O 3 and ferroelectric PbZrO by adding small amounts Pb(Mn 1/3 Nb 2/3 )O PbTiO . These new a / PZT/polymer composite sheets also in medical transducers. were fabricated using “dicing filling” technique. The resulting composites...