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takaki Hatae,H. Yoshida,M. Nakatsuka,O. Naito,S. Kitamura,T. Hamano,T. Sakuma 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Phase conjugate mirror based on stimulated Brillouin scattering (SBS) is a fundamentally new and promising technology, and it is applicable to plasma diagnostics in order to improve the measurement performance. A review is presented about the applications of SBS phase conjugation to Thomson scattering diagnostics in JT-60U and ITER. Proposed applications using the phase conjugate mirror to plasma diagnostics, namely double-pass and multipass Thomson scattering methods, were described. Improvement of diagnostic laser system for Thomson scattering employing the phase conjugate mirror are also described.I
Vorpahl, Christian,Alekseev, Andrey,Arshad, Shakeib,Hatae, Takaki,Khodak, Andrei,Klabacha, Jonathan,Le Guern, Frederic,Mukhin, Eugene,Pak, Sunil,Seon, Changrae,Smith, Mark,Yatsuka, Eiichi,Zvonkov, Ale North-Holland 2017 Fusion engineering and design Vol.123 No.-
<P><B>Abstract</B></P> <P>Numerous plasma-near mirrors of optical diagnostics in ITER require protection from erosion and deposition caused by impinging particles. This is achieved by 63 Diagnostic Shutters, which shall operate in vacuum under high thermal and neutron fluxes over 20 years without maintenance, ruling out standard engineering solutions. In fact, these conditions are unprecedented even on fusion devices. Hence, qualification R&D efforts are extensive, because if a shutter fails, so does the respective diagnostic.</P> <P>Shutter design tasks are widespread among Domestic Agencies and their suppliers, because every shutter is part of the diagnostic it shall protect when not in use. However, as these highly resembling systems have obvious synergy potential, a coordination strategy for all ITER shutters was implemented at IO.</P> <P>An extensive shutter experience collection including failure reports from 14 fusion devices was performed. These are summarized in the present work. For the first time, the state-of-the-art of shutters is thereby defined and assessed as to its applicability to ITER. Furthermore, design-driving environmental effects due to the specific operating conditions are recalled and evaluated. The findings of both assessments are put into context with the current designs of all ITER shutters. In a next step, these are reviewed with emphasis on synergies between different shutter systems. Finally, recommendations on necessary prototyping and generic components are given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Plasma-near first mirrors of ITER optical diagnostics are protected by 63 so-called <I>Diagnostic Shutters.</I> </LI> <LI> Harsh conditions rule out standard engineering solutions. </LI> <LI> If a shutter fails, so does its diagnostic, impeding ITER operation. </LI> <LI> As a design starting point, the state-of-the-art was defined by an extensive experience collection, the most frequent causes of failure being increased friction, standard mechanical problems and operational loads. </LI> <LI> All current ITER shutter designs were reviewed, yielding a limited set of <I>critical</I> components: Actuators, bearings and vacuum feedthroughs. </LI> <LI> Consequent recommendations for necessary R&D in an integrated strategy for all shutters are presented. </LI> </UL> </P>
Edge profile measurements using Thomson scattering on the KSTAR tokamak.
Lee, J H,Oh, S,Lee, W R,Ko, W H,Kim, K P,Lee, K D,Jeon, Y M,Yoon, S W,Cho, K W,Narihara, K,Yamada, I,Yasuhara, R,Hatae, T,Yatsuka, E,Ono, T,Hong, J H American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>In the KSTAR Tokamak, a 'Tangential Thomson Scattering' (TTS) diagnostic system has been designed and installed to measure electron density and temperature profiles. In the edge system, TTS has 12 optical fiber bundles to measure the edge profiles with 10-15 mm spatial resolution. These 12 optical fibers and their spatial resolution are not enough to measure the pedestal width with a high accuracy but allow observations of L-H transition or H-L transitions at the edge. For these measurements, the prototype ITER edge Thomson Nd:YAG laser system manufactured by JAEA in Japan is installed. In this paper, the KSTAR TTS system is briefly described and some TTS edge profiles are presented and compared against the KSTAR Charge Exchange Spectroscopy and other diagnostics. The future upgrade plan of the system is also discussed in this paper.</P>
Dynamic Chest X-Ray Using a Flat-Panel Detector System: Technique and Applications
Hata Akinori,Yamada Yoshitake,Tanaka Rie,Nishino Mizuki,Hida Tomoyuki,Hino Takuya,Ueyama Masako,Yanagawa Masahiro,Kamitani Takeshi,Kurosaki Atsuko,Sanada Shigeru,Jinzaki Masahiro,Ishigami Kousei,Tomiy 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.4
Dynamic X-ray (DXR) is a functional imaging technique that uses sequential images obtained by a flat-panel detector (FPD). This article aims to describe the mechanism of DXR and the analysis methods used as well as review the clinical evidence for its use. DXR analyzes dynamic changes on the basis of X-ray translucency and can be used for analysis of diaphragmatic kinetics, ventilation, and lung perfusion. It offers many advantages such as a high temporal resolution and flexibility in body positioning. Many clinical studies have reported the feasibility of DXR and its characteristic findings in pulmonary diseases. DXR may serve as an alternative to pulmonary function tests in patients requiring contact inhibition, including patients with suspected or confirmed coronavirus disease 2019 or other infectious diseases. Thus, DXR has a great potential to play an important role in the clinical setting. Further investigations are needed to utilize DXR more effectively and to establish it as a valuable diagnostic tool.
Hata, Satoshi,Nagai, Naoyuki,Yasui, Toyoaki,Tsukamoto, Hiroshi Korean Society for Fluid machinery 2008 International journal of fluid machinery and syste Vol.1 No.1
For mechanical drive steam turbines, the investigation results of corrosion fatigue phenomena in the transient zone are introduced, including basic phenomena on expansion line and actual design and damage experience. These results were analyzed from the standpoint of stress intensity during the start of cracking. In order to resolve such problems, preventive coating and blade design methods against fouling and corrosive environments are developed. Detailed evaluation test results are given for coating performance using a unique test procedure simulating fouling phenomena and washing conditions. Finally, the results of the successful modification of internals and on-line washing results on site are introduced.
The Use of Transabdominal Ultrasound in Inflammatory Bowel Disease
Hata Jiro,Imamura Hiroshi 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.3
Transabdominal ultrasound (TAUS) is useful in all aspects of lesion screening, monitoring activity, or treating/diagnosing any related complications of inflammatory bowel disease. Its ability to screen or diagnose complications is almost the same as that of other methods, such as CT or MRI. Moreover, its noninvasiveness makes it a first-line examination method. A TAUS image depicting ulcerative colitis will show large intestinal wall thickening that is continuous from the rectum, which is mainly due to mucosal layer thickening, while for Crohn’s disease, a TAUS image is characterized by a diversity in the areas affected, distribution, and layer structure. Indicators of activity monitoring include wall thickness, wall structure, and vascular tests that use Doppler ultrasound or contrast agents. While all of these have been reported to be useful, at this time, no single parameter has been established as superior to others; therefore, a comprehensive evaluation of these parameters is justified. In addition, evaluating the elasticity of lesions using elastography is particularly useful for distinguishing between fibrous and inflammatory stenoses. However, the lack of objectivity is the biggest drawback of using ultrasound. Standardizing and popularizing the ultrasound process will be necessary, including scanning methods, equipment settings, and image analysis.