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203 results on '"Mochizuki, Takayasu"'

6. Propagation characteristics of a diffracted [M.sup.2] beam

Author

Amano, Sho and Mochizuki, Takayasu

Subjects
Diffraction patterns -- Analysis, Beam optics -- Research, Astronomy, Physics
Abstract

The propagation characteristics of a beam diffracted by a circular aperture are investigated. The beam-quality factor [M.sup.2] defined by an 86.5% power-content radius is given theoretically and experimentally as a function of the truncation ratio. It is found that the theoretical limit of [M.sup.2] is 2.37 times as great as that of an incident beam as the truncation ratio approaches 0. For a weakly diffracted beam a simple formula giving [M.sup.2] is derived. Although [M.sup.2] does not increase much with diffraction, the influence of diffraction should be taken into account in beam brightness. OCIS codes: 260.1960, 000.4430, 030.4070, 050.1220.

Published
2002

7. High average and high peak brightness lab laser

Author

Amano, Sho and Mochizuki, Takayasu

Subjects
Lasers -- Design and construction, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A high average and high peak brightness slab laser was developed.

Published
2001

8. Performance of composite glass slab laser

Author

Tajima, Hidemi, Moriyama, Mitsuhisa, Tadokoro, Nobuyuki, Hara, Hideo, and Mochizuki, Takayasu

Subjects
Lasers -- Innovations, Composite materials -- Usage, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The operational characteristics of composite glass slab lasers are discussed. Composite glass was fabricated from laser glass and nondoped glass by the application of thermal fusion. Elliptic-shaped reflectors were attached at both sides of the glass slab and light was focused on the structure from four water-cooled lamps. The device was then subjected to laser oscillation tests and its behavior was evaluated using a computer simulation technique. Results reveal that composite glass slab performs more effectively compared to conventional monolithic slab.

Published
1992

21. Experimental Study of Nuclear Astrophysics with Photon Beams

Author

Shima, Tatsushi, primary, Nagai, Yasuki, additional, Miyamoto, Shuji, additional, Amano, Sho, additional, Horikawa, Ken, additional, Mochizuki, Takayasu, additional, Utsunomiya, Hiroaki, additional, Akimune, Hidetoshi, additional, Ozawa, Akira, additional, and Lu, Weiping, additional

Published
2010
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22. Study of [sup 12]C(γ, 2α)[sup 4]He with NewSUBARU laser Compton scattered gamma-ray beam

Author

Shima, Tatsushi, primary, Nagai, Yasuki, additional, Miyamoto, Shuji, additional, Amano, Sou, additional, Horikawa, Ken, additional, Mochizuki, Takayasu, additional, Utsunomiya, Hiroaki, additional, Akimune, Hidetoshi, additional, Tanihara, Isao, additional, Ong, Hooi Jin, additional, Tamii, Atsushi, additional, Kishimoto, Tadafumi, additional, Kajino, Toshitaka, additional, Kubono, Shigeru, additional, and Shima, Tatsushi, additional

Published
2010
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48. Crystallization mechanism of a-Si and a-Ge by soft X-ray irradiation.

Author

Kino, Shota, Heya, Akira, Nonomura, Yuki, Matsuo, Naoto, Kanda, Kazuhiro, Miyamoto, Shuji, Amano, Sho, Mochizuki, Takayasu, Toko, Kaoru, Sadoh, Taizoh, and Miyao, Masanobu

Abstract

We investigated a low-temperature crystallization of a- Si and a-Ge films by the synchrotron radiation soft X-ray irradiation at storage-ring current of 25–220 mA. It is found that the crystallization temperatures of a-Si and a-Ge were decreased from 680 to 580 °C and from 500 to 390 °C. These decreasements relate effects of enhancement atomic migration via electron excitation at valence band and core level. [ABSTRACT FROM PUBLISHER]

Published
2012

50. Laser-Compton Gamma-Ray Source at a Beamline (BL1) in NewSUBARU.

Author

Amano, Sho, Horikawa, Ken, Miyamoto, Shuji, and Mochizuki, Takayasu

Subjects
LASERS, ELECTRON beams, GAMMA rays, STORAGE rings, PARTICLE accelerators
Abstract

We have developed a laser-Compton gamma-ray source at beamline (BL1) in NewSUBARU, an electron storage ring operating at electron energies of 0.7–1.5 GeV. Initially, we generated 17–37 MeV gamma rays using a Nd:YVO4 laser operating at 1.06 μm and 0.53 μm, achieving a luminosity of 6000 photons/(W·mA·s) and a flux of 5×106 photons/s with a laser power of 4 W and a beam current of 200 mA. We then installed a CO2 laser operating at 10.6 μm, and generated gamma rays in the energy range of 1–4 MeV. In this range, the gamma-ray luminosity is 7300 photons/(W·mA·s) and the flux is 5.6×106 photons/s when operating the laser at 4 W and 200 mA. These performances are in good agreement with calculations. We will next add a Tm-fiber laser operating at 2 μm to generate gamma rays in the energy range of 4–21 MeV, using a laser-focusing design to generate the maximum flux. The luminosity of this stage is calculated to be 6400 photons/(W·mA·s). Nd:YVO4, CO2, and Tm-fiber laser are all capable of operating in a high-power regime and can generate kW-level output power. At present, the maximum gamma-ray flux is limited only by the laser power. When operating the laser at 1 kW of output power with a beam current of 200 mA, we expect a flux of up to ∼109 photons/s. At NewSUBARU, up to several dozen MeV gamma-ray sources are capable of generating such high power. [ABSTRACT FROM AUTHOR]

Published
2010
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