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Oscillation of 1MW at quad-frequency 203GHz, 170 GHz, 137GHz and 104GHz were demonstrated with a high-order mode (TE31,11) gyrotron developed for ITER. The final design of the ITER equatorial launcher has being implemented. The RF prototype testing to validate the millimeter wave design of the launcher were carried out and the results confirmed the steering range and quality of mm-wave beam and in-directly...
We have developed the ultra-thin MEMS mirror device. The thickness of the mirror device is 5.31 μm including Si structures and actuators. The mirror device was fabricated using SOI wafer on which Pt/SRO/PZT/SRO/Pt/Ti/SiO2 were deposited. The device was bonded on a flexible polyimide substrate and wired using adhesion passed and conductive paste. The mirror device was operated on the bent substrate.
A world record capacity 118.5 Tbit/s transmission through optical fiber with a 125 micron cladding diameter was achieved using a low loss and 316 km-long full space division multiplexing link incorporating multiple vendor technologies.
In order to decrease the measurement error of piezoelectric-cantilever current sensor caused by position and orientation errors, a position and orientation correction scheme including an array of piezoelectric cantilever and a system of nonlinear equations is presented in this paper. By solving the system with the values of piezoelectric outputs, current to be measured can be derived. Results of experiments...
This paper presents cellular transportation from a droplet on an originator plate to a droplet on an opposing receiver plate by contact fusion of the two droplets. This technique can be applied to the exchange of medium, drug delivery, and in situ characterization for hanging droplet cell cultures. Our study allows patterning of droplet arrays on the receiver plate in ways that facilitate contact...
We propose an optically-driven gas generator on a chip by integration of a thin-film photoelectrochemical cell (PEC) and a thin-film heterojunction photovoltaic cell (PV). A Se/TiO2 PV could supply its photo-induced open circuit voltage (Voc) at 0.646 V as a DC bias voltage to a TiO2-Pt PEC in order to accelerate photoelectrolysis for gas generation without external electrical sources. Integration...
This paper reports a ScAlN vibration energy harvester (VEH). A ScAlN thin film has a large piezoelectric effect and can be deposited by a standard sputtering method. These advantages are much attractive to piezoelectric Si MEMS cantilever VEHs. However, a ScAlN thin film has a large compressive stress of ∼1 GPa, resulting in a decrease in an efficiency of energy harvesting. In this paper, we introduced...
We demonstrate the first 1-Pb/s unidirectional inline-amplified transmission over 205.6-km of single-mode 32-core fiber within C-band only. 96-Gbaud LDPC-coded PDM-16QAM channels with FEC redundancy of 12.75% realize high-aggregate spectral efficiency of 217.6 b/s/Hz.
A bearingless motor (BelM) integrating function of an electric motor and a magnetic bearing (MB) can generate torque while magnetically suspending rotor shaft without mechanical contact.
Underwater wireless systems require highly efficient underwater antennas to realize high data rate communication. Since most underwater environments are lossy mediums affecting the characteristics of conventional antennas, an antenna contained by a buffer-layer is considered. This paper presents a numerical study on the relationship between the buffer layer characteristics and the antenna performance...
Quad-frequency oscillation from 100 GHz to 200 GHz was demonstrated using ITER gyrotron at QST. Those RF beam passed through the center of the gyrotron window and good couples to transmission line were obtained for each oscillation. The mega-watt-class power was obtained for all frequencies. Validation of gyrotron for a demo reactor is numerically started on the basis of our multi-frequency gyrotron.
A gyrotron and a waveguide transmission line, which were developed for electron cyclotron heating and current drive in JT-60SA, have been tested to evaluated its high-power, long-pulse and multi-frequency capabilities. High-power oscillations up to 1.8 MW at 110 GHz and 1.3 MW at 138 GHz have been obtained so far. The spatial distribution of the temperature increase of the waveguide transmission line...
The p-channel MOS device technology is a key technology for CMOS VLSI's[1][2]. For realizing small gate length and high performance MOSFET's avoiding short channel effects, thin gate oxide and shallow source and drain (S/D) junctions are effective[3]. We have already reported high performance deep-submicrometer n-channel MOSFET's with ultra thin gate oxide[4], In this paper, we report high performance...
We have fabricated ultra-thin piezoelectric strain sensors 5×5 array on polyethylene naphthalate (PEN) flexible printed circuit (FPC) with Cu wiring. Ultra-thin PZT(2 μm)/Si(3 μm) plates (5 mm-long and 1 mm-wide) were fabricated by MEMS microfabrication technique. The fabricated ultra-thin PZT/Si plates were transferred onto the FPCs by a chip mounter with a specially designed rubber collet, where...
This paper describes excellent performance of wettability switching by selecting a combination of attractive material and structural design. We employ sputter-coated rutile-TiO2 as a photoresponsive surface. In addition, the micro-pillar array with pent-roofs is designed to enhance the hydrophobicity. The pent-roof structure allows hydrophilic materials to exhibit Cassie-Baxter type superhydrophobic...
A highly reliable cell structure of capacitive micromachined ultrasound transducer (CMUT) was proposed. This structure equips with spacers (bumps) beneath the membrane and partial openings just above the respective spacers in the top electrode. The spacers prevent the membrane from direct contacting with the bottom surface of the cavity even when the total driving voltage exceeds collapse voltage...
An adaptive MIMO equalization method is presented for few-mode fiber transmission where various differential mode delays (DMDs) simultaneously occur. Evaluation using experimental data shows its use of sparsity to promote equalization effectively deals with various DMDs to suppress the noise.
Oscillation at tri-frequency 170 GHz, 137GHz and 104GHz with more than 1MW were demonstrated with a high-order mode (TE31,11) gyrotron developed for ITER. The successful modification of the ITER equatorial launcher design to enhance off-axis current drive performance and to ensures that mm wave beams from both middle and bottom beam row pass through the same BSM opening that leads to the increase...
High-power, long-pulse operations of a gyrotron for JT-60SA (Super-Advanced) have been carried out at 110 GHz (1 MW/100 s) and 138 GHz (1 MW/100 s). These results fully satisfied the requirements of the electron cyclotron heating and current drive (ECH/CD) system in JT-60SA. It was experimentally shown that the higher power operation at each frequency is expected to be acceptable for this gyrotron...
We describe the design and characterization of a 3-type heterogeneous 36-core, 3-mode fiber with record spatial channel count and density and perform transmission measurements in all 108 spatial channels using 40×100GHz spaced 25GBaud DP-QPSK signals.
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