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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.
Anisotropic g-values and 1.590 THz antiferromagnetic gap of multiferroic material CuO has been observed for the first time using the advantages of THz high field ESR. Especially antiferromagnetic resonance measurements have been performed at 4.2 K for three principal axes up to 1.852 THz and 40 T, and the magnetic anisotropy of CuO will be discussed.
The present study describes the MEMS-based piezoelectric switch to activate the event-driven wireless sensor node for chicken health monitoring system. We have fabricated the switch composed of “S” shaped piezoelectric cantilever and proof mass, where the resonance is 24 Hz. When the switch has been vibrated at 4, 6, 8, and 12 Hz, which is close to the chicken movement frequency, the input vibration...
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.
Coaxial feeds are effective to obtain rotationally symmetrical radiation patterns with a broad beamwidth or primary patterns reducing the spillover loss. For precisely controlling mutual coupling between the fed waveguide and the outer corrugation, we have developed a multimode horn loading coaxial grooves which works as a higher-order mode converter. In this paper, for improving the frequency characteristics...
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...
We propose a digital output piezoelectric accelerometer for chicken health monitoring. The accelerometer has patterned Pb(Zr, Ti)O3 (PZT) thin films electrically acc connected in series, which accompany CMOS switches. The elerometer converts acceleration into number of on-state CMOS switches, which can be called as "digital output". Since the accelerometer are based on piezoelectric effect,...
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