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33 results on '"Yamagami, T"'

2. Preliminary observation of polarization for Crab Nebula by PHENEX polarimeter

Author

Kanno, M., primary, Gunji, S., additional, Kishimoto, Y., additional, Murayama, H., additional, Ishigaki, Y., additional, Tokanai, F., additional, Sakurai, H., additional, Ishikawa, Y., additional, Katayama, K., additional, Hayashida, K., additional, Morimoto, M., additional, Anabuki, N., additional, Tsunemi, H., additional, Saito, Y., additional, Yamagami, T., additional, Mihara, T., additional, Kohama, M., additional, Suzuki, M., additional, and Kishimoto, S., additional

Published
2007
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3. Basic Performance of PHENEX : A Polarimeter for High ENErgy X rays

Author

Kishimoto, Y., primary, Gunji, S., additional, Ishigaki, Y., additional, Kanno, M., additional, Murayama, H., additional, Ito, C., additional, Tokanai, F., additional, Suzuki, K., additional, Sakurai, H., additional, Mihara, T., additional, Kohama, M., additional, Suzuki, M., additional, Hayato, A., additional, Hayashida, K., additional, Anabuki, N., additional, Morimoto, M., additional, Tsunemi, H., additional, Saito, Y., additional, Yamagami, T., additional, and Kishimoto, S., additional

Published
2006
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7. Basic Performance of PHENEX: A Polarimeter for High ENErgy X rays.

Author

Kishimoto, Y., Gunji, S., Ishigaki, Y., Kanno, M., Murayama, H., Ito, C., Tokanai, F., Suzuki, K., Sakurai, H., Mihara, T., Kohama, M., Suzuki, M., Hayato, A., Hayashida, K., Anabuki, N., Morimoto, M., Tsunemi, H., Saito, Y., Yamagami, T., and Kishimoto, S.

Subjects
POLARISCOPE, POLARIMETRY, X-rays, POLARIZATION of electromagnetic waves, NUCLEAR counters, CRAB Nebula
Abstract

We have been developing an instrument named "PHENEX (Polarimetry for High ENErgy X rays)" to measure polarization in the hard X-ray region. The PHENEX polarimeter consists of detector modules called "unit counters". We have investigated the performance of the unit counter, using a highly polarized beam in KEK-PF BL14A. From these measurements, we obtained a detection efficiency of 20% and a modulation factor (analyzing power for polarization) of 53% for 80 keV X rays. Assembling four unit counters, a balloon-flight version was constructed and a preliminary observation of the Crab Nebula was carried out on Jun. 13th, 2006. During this flight, the PHENEX polarimeter observed the Crab for about one hour and detected its hard X rays with a significance of 9σ. From this result, we expect that a PHENEX polarimeter with nine "unit counters" would achieve a 17% minimum detectable polarization of the Crab Nebula with 3σ significance in a 3-hour observation. [ABSTRACT FROM AUTHOR]

Published
2007
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8. BSMILES - a balloon-borne superconducting submillimeter-wave limb-emission sounder for stratospheric measurements.

Author

Irimajiri, Y., Manabe, T., Ochiai, S., Masuko, H., Yamagami, T., Saito, Y., Izutsu, N., Kawasaki, T., Namiki, M., and Murata, I.

Abstract

A balloon-borne superconducting submillimeter-wave limb-emission sounder (BSMILES) was developed to observe thermal emission lines from stratospheric minor constituents. BSMILES carries a 300-mm-diameter offset parabolic antenna, a 624-639-GHz superconductor-insulator-superconductor (SIS) receiver, a three-axis fiber-optical gyroscope, and an acousto-optical spectrometer. BSMILES was launched from the Pacific Coast of Japan. All systems operated properly and emission line spectra of stratospheric gases, such as O3, HCl, HO2, and O3 isotopes were measured. The system noise temperature in double sideband (DSB) during the flight was less than 460 K over the observing bandwidth with a best value of 330 K that is 11 times as large as the quantum limit (11hν/kB). After the observation, the gondola splashed down in the Pacific Ocean and was retrieved. Almost all instruments were waterproofed, and it has been proved that they are reusable. [ABSTRACT FROM PUBLISHER]

Published
2006
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