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206. Increasing of Peak Power of Superradiation Pulses by Variation of Accelerating Voltage.

Author

Ginzburg, N. S., Zotova, I. V., Rozental, R. M., Sergeev, A. S., Kamada, M., Sugawara, K., Kurihara, K., Shirasaka, H., Ando, R., and Kamada, K.

Subjects
PARTICLE beams, NUCLEAR physics
Abstract

Modeling carried out demonstrates possibility of generation of gigawatt power level S band microwave pulse with duration of several nanoseconds using superradiation of short electron beam moving along slow-wave periodical structure. A 10 ns / 500 keV / 5 kA accelerator of Kanazawa University can be used in such experiments. It is shown that significant increasing peak power can be obtained by optimization of voltage and current pulses waveforms. [ABSTRACT FROM AUTHOR]

Published
2002

216. Experimental Apparatus to Search for Supersolidity in Monolayer $$^4$$ He on Graphite.

Author

Kubota, Y., Toda, R., Kamada, M., Nakamura, S., Matsui, T., and Fukuyama, Hiroshi

Subjects
SUPERFLUIDITY, QUANTUM solids, THERMAL properties of graphite, MONOMOLECULAR films, SEASONAL temperature variations
Abstract

We describe some details of a new experimental setup for torsional oscillator (TO) measurement of $$^4$$ He monolayers adsorbed on a graphite surface. This setup is designed to seek for the possible supersolid phase, in which crystalline order coexists with superfluidity, in two dimensional (2D) solid $$^4$$ He below 300 mK. Among such 2D solids, the commensurate phase in the second layer on graphite is the most hopeful candidate for the novel supersolid phase since it is the lowest-density quantum solid ever found. An exfoliated graphite substrate we used is ZYX which has at least ten times longer surface coherence length compared to Grafoil, an exfoliated graphite most commonly used in previous experiments. The first version of TO we made has the resonant frequency of 786.8 Hz and the Q value of $$1.1\times 10^5$$ at $$T \le 10$$ mK. The resonant frequency of this particular TO without any He samples ( $$f_{\mathrm {cell}}$$ ) showed unexpectedly large temperature variation and non-reproducibility below 1 K as well as sudden jumps when mechanical shocks are applied to the experimental apparatus. We found the stability of $$f_{\mathrm {cell}}$$ is highly correlated with the temperature stability of 1 K pot in dilution refrigerator. [ABSTRACT FROM AUTHOR]

Published
2014
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228. Upgraded IR beamline at UVSOR

Author

Sakurai, M., primary, Okamura, H., additional, Watanabe, M., additional, Nanba, T., additional, Kimura, S., additional, and Kamada, M., additional

Published
1998
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