9 results on '"Yoichi Sato"'
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2. Evaluation method for effect of active vibration control on cooling performance of Stirling cooler
- Author
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Yoichi Sato, Kosuke Tanaka, Keisuke Shinozaki, Shuhei Shigeto, and Shinji Mitani
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010302 applied physics ,Materials science ,Stirling engine ,General Physics and Astronomy ,Cooling capacity ,01 natural sciences ,Signal ,Automotive engineering ,Power (physics) ,law.invention ,Vibration ,symbols.namesake ,law ,Active vibration control ,0103 physical sciences ,symbols ,General Materials Science ,010306 general physics ,Carnot cycle ,Gas compressor - Abstract
Accepted: 2021-04-30, 資料番号: PA2210020000
- Published
- 2021
3. Outgas analysis of mechanical cryocoolers for long lifetime
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Keisuke Shinozaki, Seiji Yoshida, Kenichi Kanao, Hiroyuki Sugita, Katsuhiro Narasaki, Shoji Tsunematsu, Kiyomi Otsuka, Noriko Y. Yamasaki, Kenichiro Sawada, Takao Nakagawa, Kazuhisa Mitsuda, and Yoichi Sato
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Stirling cooler ,Materials science ,Stirling engine ,Liquid helium ,Nuclear engineering ,Outgas reduction ,Joule–Thomson effect ,General Physics and Astronomy ,Cryocooler ,01 natural sciences ,Long lifetime ,law.invention ,010309 optics ,symbols.namesake ,Outgassing ,Piston ,law ,0103 physical sciences ,Heat exchanger ,Regenerative heat exchanger ,symbols ,Joule Thomson cooler ,General Materials Science ,010306 general physics - Abstract
著者人数: 12名, Accepted: 2017-10-01, 資料番号: SA1170240000
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- 2017
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4. Lifetime test of the 4K Joule-Thomson cryocooler
- Author
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Keisuke Shinozaki, Kiyomi Ootsuka, Kenichi Kanao, Hiroyuki Sugita, Takao Nakagawa, Noriko Y. Yamasaki, Kosuke Tanaka, Shoji Tsunematsu, Kenichiro Sawada, Kazuhisa Mitsuda, Yoichi Sato, and Katsuhiro Narasaki
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010302 applied physics ,Engineering ,Continuous operation ,business.industry ,Design specification ,Joule–Thomson effect ,General Physics and Astronomy ,Spica ,Cryocooler ,01 natural sciences ,symbols.namesake ,0103 physical sciences ,symbols ,General Materials Science ,Stirling cryocooler ,Aerospace engineering ,010306 general physics ,business - Abstract
The 4K Joule-Thomson (JT) cryocooler is a key cryogenic component for future astronomy missions such as ATHENA and LiteBIRD. It was originally developed for SMILES (2009) and upgraded for ASTRO-H/SXS (2016) and SPICA. The 20K two-stage Stirling cryocooler developed for AKARI (2006) was also upgraded and used as a precooler. The operational life is a critical factor in planning long-term missions. An engineering model of the 4K-JT cryocooler was built for continuous operation to verify its lifetime. Testing was done from 2010 to 2019 and successful three-year operation was demonstrated with an extended operation; this was beyond the design specification. This paper describes the overall history of the lifetime test of the 4K-JT cryocooler and an evaluation of the end-of-life cooling performance and performance changes during long-term operation.
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- 2021
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5. Improvement of micro-vibration of a two-stage Stirling cryocooler
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Keisuke Shinozaki, Yoichi Sato, Kazuhisa Mitsuda, Noriko Y. Yamasaki, Katsuhiro Narasaki, Kenichi Kanao, Yoshikatsu Hiratsuka, Takao Nakagawa, Shoji Tsunematsu, and Kiyomi Otsuka
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010302 applied physics ,Physics ,Ball bearing ,Stirling engine ,Detector ,General Physics and Astronomy ,Mechanical engineering ,Cryocooler ,Flexure bearing ,01 natural sciences ,law.invention ,Vibration ,Vibration isolation ,law ,0103 physical sciences ,General Materials Science ,010306 general physics ,Gas compressor - Abstract
Two-stage Stirling cryocoolers (2ST cooler) produced by Sumitomo Heavy Industries, Ltd. have been launched into orbit on three satellites: the “AKARI (ASTRO-F)” infrared astronomical satellite, JEM/SMILES on ISS, and the “HITOMI (ASTRO-H)” X-ray astronomical satellite. A 2ST cooler compressor has a linear-ball-bearing system as a piston-supporting structure. The linear ball bearing system is a key components to realize a lower drive frequency (15 Hz), a long piston stroke (30 mm). Its typical cooling power is 200 mW at 20 K for the second stage and 1000 mW at 100 K for the first stage, with 90 W electrical input power. During the test of the “HITOMI” engineering model, the energy resolution of the detector was found to be degraded when cryocoolers were in operation. After investigation, it was found that micro vibration from 2STs caused the degradation. The continuum in the vibration spectrum propagated into sub-Kelvin region and generated thermal noise. The continuum has origin in linear ball bearing in the compressor. In the case of “HITOMI”, vibration isolators were introduced to resolve this issue. For future mission, we are required to reduce microvibration of cryocooler itself. Therefore, the piston support mechanism in the compressor was modified from linear ball bearings to triangle shape flexure springs in order to reduce the continuum in vibration spectrum. In order to achieve a long piston stroke (±15 mm), the generated stress could be reduced to 400 MPa (Less than 1/2 of fatigue limit) or less even when the shape of the triangle shape flexure spring was devised and displaced by 15 mm. The typical vibration level has been reduced to 1 × 10−5 Nrms2 / Hz or less at a frequency of 200 Hz or less and 1/10 times or less at 200–600 Hz than that of a compressor with a linear ball bearing system. The cooling power is kept to 260 mW at 20 K, with 90 W electrical input power. This low vibration cooler is expected to be an improved cryogenic system for use in future projects with sub-Kelvin detectors.
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- 2020
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6. Cooling capability of JT coolers during the cool-down phase for space science missions
- Author
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Yoichi Sato, Kazuhisa Mitsuda, Hiroyuki Sugita, Takao Nakagawa, Kenichiro Sawada, Keisuke Shinozaki, Kenichi Kanao, J. M. Duval, Noriko Y. Yamasaki, T. Prouvé, Chihiro Tokoku, Shoji Tsunematsu, Ivan Charles, Laboratoire des Cryoréfrigérateurs et Cryogénie Spatiale (LCCS), Département des Systèmes Basses Températures (DSBT ), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)
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010302 applied physics ,Scientific instrument ,[PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] ,business.industry ,Infrared telescope ,Joule–Thomson effect ,Phase (waves) ,General Physics and Astronomy ,Spica ,01 natural sciences ,Heat capacity ,law.invention ,Telescope ,symbols.namesake ,law ,0103 physical sciences ,[PHYS.MECA.THER]Physics [physics]/Mechanics [physics]/Thermics [physics.class-ph] ,symbols ,Environmental science ,General Materials Science ,Space Science ,Aerospace engineering ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,010306 general physics ,business - Abstract
In space science missions that uses cryogen-free mechanical cooler systems to cool the low temperature telescope and detectors, a cooling time from room temperature to low temperature should be considered in the required mission life time, because of a limited cooling power of mechanical cooler. For instance, in the Space Infrared Telescope for Cosmology and Astrophysics (SPICA), the 4K-class Joule Thomson cooler (4K-JT) and the 1K-class Joule Thomson cooler (1K-JT) are being considered to cool a 2.5 m telescope and provide a 1–4 K environment for scientific instruments. The cooling capability of these JT coolers, below 20 K and even lower than 5 K, is critical for initial cooling. The 4K-JT cooling from precooling to operating temperatures under the heat input was measured and confirmed that the 4K-JT has enough cooling power to cool with these heat load. The 1K-JT cool down measurement with heater was also performed. These results enabled us to estimate the cool down time for the heat capacity provided by the telescope and scientific instruments assumed in SPICA, LiteBIRD and the ESA X-ray mission ATHENA.
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- 2020
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7. Thermal study of payload module for the next-generation infrared space telescope SPICA in risk mitigation phase
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Keiji Komatsu, Keisuke Shinozaki, Toshihiro Yamawaki, Katsuhiro Narasaki, Shigeki Takai, Shoji Tsunematsu, Kenichiro Sawada, Hiroshi Murakami, Hideo Matsuhara, Tadahiro Mizutani, Makoto Takada, Yoichi Sato, Makiko Ando, Akinobu Okabayashi, Takao Nakagawa, Kenichi Kanao, and Hiroyuki Sugita
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Physics ,Radiative cooling ,SPICA ,business.industry ,Infrared telescope ,Astrophysics::Instrumentation and Methods for Astrophysics ,General Physics and Astronomy ,Spica ,Radiant cooling ,Cryo cooler ,law.invention ,Telescope ,law ,Water cooling ,General Materials Science ,Astrophysics::Earth and Planetary Astrophysics ,Aerospace engineering ,Infrared ,business ,Radiator ,Astrophysics::Galaxy Astrophysics ,Remote sensing ,Halo orbit - Abstract
著者人数: 17名, 資料番号: SA1004974000
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- 2014
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8. Development Status of the Mechanical Cryocoolers for the Soft X-ray Spectrometer on board Astro-H
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Kazuhisa Mitsuda, Kenichi Kanao, Hiroyuki Sugita, Noriko Y. Yamasaki, Toshiyuki Nishibori, Kiyomi Ootsuka, Masahide Murakami, Ryota Sato, Ken Goto, Keisuke Shinozaki, Kenichi Kikuchi, Katsuhiro Narasaki, Yoichi Sato, Kenichiro Sawada, Yoh Takei, Shoji Tsunematsu, Takao Nakagawa, and Ryuichi Fujimoto
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Materials science ,Stirling engine ,Spectrometer ,Liquid helium ,Nuclear engineering ,Joule–Thomson effect ,General Physics and Astronomy ,Astro-H/SXS ,Cryocooler ,Vibration ,law.invention ,symbols.namesake ,Outgassing ,Contamination ,law ,symbols ,Water cooling ,Double-staged Stirling cooler ,Joule Thomson cooler ,General Materials Science ,Gas compressor ,Lifetime - Abstract
著者人数: 18名, 資料番号: SA1004976000
- Published
- 2014
9. Development of mechanical cryocoolers for Astro-H/SXS
- Author
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Masahide Murakami, Ryuichi Fujimoto, Katsuhiro Narasaki, Takao Nakagawa, Shoji Tsunematsu, Kiyomi Otsuka, Hiroyuki Sugita, Kazuhisa Mitsuda, Kenichi Kanao, and Yoichi Sato
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Physics ,Stirling engine ,Spectrometer ,Liquid helium ,Nuclear engineering ,Joule–Thomson effect ,Refrigerator car ,General Physics and Astronomy ,Thermodynamics ,Cryogenics ,Heat sink ,Cryocooler ,law.invention ,symbols.namesake ,law ,symbols ,General Materials Science - Abstract
Accepted: 2010-02-22, 資料番号: SA1002677000
- Published
- 2010
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