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High frequency gyrotrons developed in FIR UF covering sub-THz to THz range have achieved operation functions such as high stabilization of frequency and power, high speed frequency modulation and frequency tunability. Such gyrotrons with functions of frequency and power control have opened new horizon of high power THz technologies, for example, high frequency DNP-NMR spectroscopy, direct measurement...
The limitation of the package height in the smartphone becomes severer and severer. Especially in the case of application processer, TSV structure is necessary to clear 1mm package height that is stacked by 2–4 DRAMs inside. But not only the cost of fabricating Through Si Via (TSV) on the Si device is expensive, also handling of the thin chip is fragile. To solve these problems, we have developed...
We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 20 kW power using a gyrotron and high finesse Fabry-Pérot resonator. We report the current status of our experiment.
We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-Pérot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured...
We are preparing an experiment searching for hypothetical particles which couple very weakly to photons, such as axions and paraphotons. Using sub-THz photons, our new experiment is sensitive to different axion/paraphoton masses from existing experiments which use visible photons.
The direct transition from o-Ps to p-Ps was firstly observed, using a gyrotron, a mode-converter and a Fabry-Pérot cavity. The Einstein's A coefficient is measured as 3.9 (+1.8 −1.7) • 10−8 s−1. It is the first step to directly examine a reported discrepancy of positronium hyperfine splitting.
For direct measurement on hyperfine structure of positronium, high power sub-THz radiation sources, Gyrotrons FU CW V and FU CW VIII have been developed. FU CW V is a frequency fixed gyrotron operating at 203.3 GHz for the proof-of-principle experiment and FU CW VIII a frequency continuously tunable gyrotron to measure directly the energy difference between orth- and para states of positronium.
Sophisticated multimodal interfaces are the key to success in future computer development and many ideas have been proposed so far. Augmented reality (AR) is such an idea. Computer-generated digital objects are mixed with objects in the real world, and they are perceptually assimilated. People don't need to be aware of the computer. What to do for them is just behave as usual in the real world. However,...
Gyrotron FU CW V operating at the fundamental cyclotron resonance is used for measurement of hyperfine structure on positronium. The gyrotron delivers high power radiation with the frequency of 203.2 GHz and output power of 0.7 kW under CW operation mode. This radiation can be used for direct measurement of energy level transition of positronium, because expected energy level difference is near 203...
Due to increase of integration density on a chip, layout variations have a serious impact on MOSFET behavior, such as active-area-size dependence (the STI-stress effect), well-boundary location dependence (the well-proximity effect) and other proximity effects. A circuit MOSFET model (An extracted SPICE-parameter set) tends to have complex expressions. Circuit designers, however, require a sufficiently...
Accurate measurement of difference between energy levels of positronium is a current important subject in the experimental physics of elementary particles. The frequency corresponding to the energy difference is about 203.39 GHz. At least, 100 watt CW power is requested for the direct measurement. We are now designing such a gyrotron FU CW V consisting of an 8 T superconducting magnet and a demountable...
We describe the integration of a 45-nm node CMOS for low operation power (LOP) application. The SD extension profile along with a strain channel and a thin-gate-SiON were optimized to keep high drive current at the 45-nm node. A novel STI structure was developed to reduce the SRAM cell size. Nano-clustering silica (NCS) without a middle-etch stopper (MES) was also developed to decrease the wire capacitance...
Problem areas in materials for future ULSIs are identified and possible solutions are discussed. Many new materials have already been used in addition to the usual silicon, its oxide and aluminum to make state-of-the-art LSIs which contain up to forty million transistors and feature line-widths around 0.8 mu m. Why the materials have to be reviewed to further exploit the ultimate potential of integrated...
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