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Comparative study on sulfamethoxazole degradation by Fenton and Fe(ii)-activated persulfate process

RSC Advances 2017年第77期7卷 48670-48677页

作者： Shizong Wang Jianlong Wang Collaborative Innovation Center for Advanced Nuclear Energy Technology INET Tsinghua University Beijing 100084 P. R. China State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 P. R. China Beijing Key Laboratory of Radioactive Wastes Treatment Tsinghua University Beijing 100084 P. R. China

Pharmaceuticals and personal care products (PPCPs) are emerging contaminants, which are ubiquitous and pose the potential risk to ecosystem and human health. It is necessary to remove PPCPs from water and wastewater. In this study, sulfamethoxazole, a widely used antibiotic, was chosen as targeted pollutant. Fenton process and persulfate process were employed to remove sulfamethoxazole from aqueous solution. The results showed that Fenton process required less amount of Fe(II) and oxidant than persulfate process to achieve 100% removal of sulfamethoxazole in the water sample prepared with de-ionized water. The maximal mineralization reached 83% when hydrogen peroxide concentration was 1 mM and Fe(II) was 0.05 mM for Fenton process. The maximal mineralization for persulfate process was 60% with 4 mM of persulfate and 4 mM of Fe(II). The increase of Fe(II) concentration could increase the decomposition of hydrogen peroxide and persulfate, but did not increase the mineralization of sulfamethoxazole, indicating that the decomposition of hydrogen peroxide and persulfate was not positive correlation with the removal and mineralization of sulfamethoxazole. Five intermediate compounds were detected in Fenton process while eight intermediate compounds in persulfate process, suggesting that different degradation pathway occurred in the two processes. The wastewater components had negative effect on the degradation of sulfamethoxazole for both Fenton and persulfate processes. The removal efficiency of sulfamethoxazole was 52.5% and 52.3%, respectively, for Fenton and persulfate processes. Persulfate process could be an alternative for treating the real wastewater containing PPCPs.

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An approximate ripple-spreading algorithm with terminal h strategy

An approximate ripple-spreading algorithm with terminal h st...

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IEEE Symposium Series on Computational Intelligence (SSCI)

作者： Xiao-Bing Hu Ming-Kong Zhang Jian-Qin Liao Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin China Academy of Disaster Reduction and Emergence Management Beijing Normal University Beijing China Chengdu MiidShare Technology Ltd Chengdu China

By allowing each node to generate up to h

关键词： Computational efficiency Optimization Relays Signal processing algorithms Algorithm design and analysis Approximation algorithms Shortest path problem

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The XYZ states: Experimental and theoretical status and perspectives

arXiv

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arXiv 2019年

作者： Brambilla, Nora Eidelman, Simon Hanhartf, Christoph Nefedievh, Alexey Shen, Cheng-Ping Thomas, Christopher E. Vairo, Antonio Yuan, Chang-Zheng School of Physics and Nuclear Energy Engineering Beihang University Beijing100191 Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia University of Chinese Academy of Sciences Beijing100049 China DAMTP University of Cambridge Wilberforce Road CambridgeCB30WA United Kingdom Key Laboratory of Nuclear Physics and Ion-beam Application Institute of Modern Physics Fudan University Shanghai200433 Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China P.N. Lebedev Physical Institute of the Russian Academy of Sciences Leninskiy Prospect 53 Moscow119991 Russia Moscow Institute of Physics and Technology Institutsky lane 9 Dolgoprudny Moscow Region141700 Russia National Research Nuclear University MEPhI Kashirskoe highway 31 Moscow115409 Russia Novosibirsk State University Novosibirsk630090 Russia Physik Department Technische Universität München GarchingD-85748 Germany Institute for Advanced Study Universität München Lichtenbergstrasse 2 GarchingD-85748 Germany

The quark model was formulated in 1964 to classify mesons as bound states made of a quark-antiquark pair, and baryons as bound states made of three quarks. For a long time all known mesons and baryons could be classified within this scheme. Quantum Chromodynamics (QCD), however, in principle also allows the existence of more complex structures, generically called exotic hadrons or simply exotics. These include four-quark hadrons (tetraquarks and hadronic molecules), five-quark hadrons (pentaquarks) and states with active gluonic degrees of freedom (hybrids), and even states of pure glue (glueballs). Exotic hadrons have been systematically searched for in numerous experiments for many years. Remarkably, in the past fifteen years, many new hadrons that do not exhibit the expected properties of ordinary (not exotic) hadrons have been discovered in the quarkonium spectrum. These hadrons are collectively known as XYZ states. Some of them, like the charged states, are undoubtedly exotic. Parallel to the experimental progress, the last decades have also witnessed an enormous theoretical effort to reach a theoretical understanding of the XYZ states. Theoretical approaches include not only phenomenological extensions of the quark model to exotics, but also modern non-relativistic effective field theories and lattice QCD calculations. The present work aims at reviewing the rapid progress in the field of exotic XYZ hadrons over the past few years both in experiments and theory. It concludes with a summary on future prospects and challenges. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum theory

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Enhanced Strength Through Nanotwinning in the Thermoelectric Semiconductor InSb

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Physical Review Letters 2017年第21期119卷 215503-215503页

作者： Guodong Li Sergey I. Morozov Qingjie Zhang Qi An Pengcheng Zhai G. Jeffrey Snyder State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA

The conversion efficiency (zT) of thermoelectric (TE) materials has been enhanced over the last two decades, but their engineering applications are hindered by the poor mechanical properties, especially the low strength at working conditions. Here we used density functional theory (DFT) to show a strength enhancement in the TE semiconductor InSb arising from the twin boundaries (TBs). This strengthening effect leads to an 11% enhancement of the ideal shear strength in flawless crystalline InSb where this theoretical strength is considered as an upper bound on the attainable strength for a realistic material. DFT calculations reveal that the directional covalent bond rearrangements at the TB accommodating the structural mismatch lead to the anisotropic resistance against the deformation combined with the enhanced TB rigidity. This produces a strong stress response in the nanotwinned InSb. This work provides a fundamental insight for understanding the deformation mechanism of nanotwinned TE semiconductors, which is beneficial for developing reliable TE devices.

关键词： Material failure Mechanical deformation Semiconductors Stress Density functional theory

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Superstrengthening Bi2Te3 through Nanotwinning

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Physical Review Letters 2017年第8期119卷 085501-085501页

作者： Guodong Li Umut Aydemir Sergey I. Morozov Max Wood Qi An Pengcheng Zhai Qingjie Zhang William A. Goddard, III G. Jeffrey Snyder State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Chemistry Koc University Sariyer Istanbul 34450 Turkey Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA Materials and Process Simulation Center California Institute of Technology Pasadena California 91125 USA

Bismuth telluride (Bi2Te3) based thermoelectric (TE) materials have been commercialized successfully as solid-state power generators, but their low mechanical strength suggests that these materials may not be reliable for long-term use in TE devices. Here we use density functional theory to show that the ideal shear strength of Bi2Te3 can be significantly enhanced up to 215% by imposing nanoscale twins. We reveal that the origin of the low strength in single crystalline Bi2Te3 is the weak van der Waals interaction between the Te1 coupling two Te1─Bi─Te2─Bi─Te1 five-layer quint substructures. However, we demonstrate here a surprising result that forming twin boundaries between the Te1 atoms of adjacent quints greatly strengthens the interaction between them, leading to a tripling of the ideal shear strength in nanotwinned Bi2Te3 (0.6 GPa) compared to that in the single crystalline material (0.19 GPa). This grain boundary engineering strategy opens a new pathway for designing robust Bi2Te3 TE semiconductors for high-performance TE devices.

关键词： First-principles calculations Material failure Mechanical deformation Semiconductors Stress

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Fe-based catalysts for heterogeneous catalytic ozonation of emerging contaminants in water and wastewater

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Chemical Engineering Journal 2017年 312卷 79-98页

作者： Jianlong Wang Zhiyong Bai Collaborative Innovation Center for Advanced Nuclear Energy Technology INET Tsinghua University Beijing 100084 PR China State Key Joint Laboratory of Environment Simulation and Pollution Control Tsinghua University Beijing 100084 PR China School of Water Resources and Environment China University of Geosciences Beijing 100083 PR China

Catalytic ozonation utilizes catalysts to improve the decomposition of ozone and the formation of hydroxyl radicals, which can overcome some disadvantages of ozonation. Fe-based materials are widely used as catalysts for heterogeneous catalytic ozonation due to their easy preparation, excellent catalytic performance and the abundance of Fe in nature. In this paper, the performances of various Fe-based catalysts, including Fe 0 -derived, FeOOH-derived, Fe 2 O 3 -derived, Fe 3 O 4 -derived and iron oxides composite, their preparation and characterization methods were briefly introduced. The catalytic ozonation using Fe-based catalysts for the degradation of various emerging contaminants, such as pesticides and herbicides, pharmaceuticals, phthalic acid esters, dyes, nitrobenzenes, phenols, as well as for the treatment of actual wastewater was summarized. The main influencing factors on catalytic ozonation of toxic organic pollutants were discussed, and their potential applications and perspectives were proposed.

关键词： advanced oxidation processes Catalytic ozonation Fe-based catalyst Emerging contaminants Wastewater treatment

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Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope

Radiative Cooling of the Thermally Isolated System in KAGRA ...

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10th Asian Conference on Applied Superconductivity and Cryogenics, ACASC 2020, 2nd International Cryogenic Materials Conference in Asia, Asian-ICMC 2020 and CSSJ Joint Conference

作者： Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Aso, Y. Bae, S.-W. Bae, Y.-B. Baiotti, L. Bajpai, R. Barton, M.A. Cannon, K. Capocasa, E. Chan, M.-L. Chen, C.-S. Chen, K.-H. Chen, Y.-R. Chu, H.-Y. Chu, Y.-K. Eguchi, S. Enomoto, Y. Flaminio, R. Fujii, Y. Fukunaga, M. Fukushima, M. Ge, G.-G. Hagiwara, A. Haino, S. Hasegawa, K. Hayakawa, H. Hayama, K. Himemoto, Y. Hiranuma, Y. Hirata, N. Hirose, E. Hong, Z. Hsieh, B.-H. Huang, G.-Z. Huang, P.-W. Huang, Y.-J. Ikenoue, B. Imam, S. Inayoshi, K. Inoue, Y. Ioka, K. Itoh, Y. Izumi, K. Jung, K. Jung, P. Kajita, T. Kamiizumi, M. Kanda, N. Kang, G.-W. Kawaguchi, K. Kawai, N. Kawasaki, T. Kim, C. Kim, J. Kim, W. Kim, Y.-M. Kimura, N. Kita, N. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A.K.H. Kotake, K. Kozakai, C. Kozu, R. Kumar, R. Kume, J. Kuo, C.-M. Kuo, H.-S. Kuroyanagi, S. Kusayanagi, K. Kwak, K. Lee, H.-K. Lee, H.-W. Lee, R.-K. Leonardi, M. Lin, C.-Y. Lin, F.-L. Lin, L.C.-C. Liu, G.-C. Luo, L.-W. Marchio, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyazaki, Y. Miyo, K. Miyoki, S. Morisaki, S. Moriwaki, Y. Nagano, K. Nagano, S. Nakamura, K. Nakano, H. Nakano, M. Nakashima, R. Narikawa, T. Negishi, R. Ni, W.-T. Nishizawa, A. Obuchi, Y. Ogaki, W. Oh, J.J. Oh, S.-H. Ohashi, M. Ohishi, N. Ohkawa, M. Okutomi, K. Oohara, K. Ooi, C.-P. Oshino, S. Pan, K.-C. Pang, H.-F. Park, J. Peiia Arellano, F.E. Pinto, I. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sakuno, Y. Sato, S. Sato, T. Sawada, T. Sekiguchi, T. Sekiguchi, Y. Shibagaki, S. Shimizu, R. Shimoda, T. Shimode, K. Shinkai, H. Shishido, T. Shoda, A. Somiya, K. Son, E.J. Sotani, H. Sugimoto, R. Suzuki, T. Suzuki, T. Tagoshi, H. Takahashi, H. Takahashi, R. Takamori, A. Takano, S. Takeda, H. Takeda, M. Tanaka, H. Tanaka, K. Tanaka, K. Tanaka, T. Tanaka, T. Tanioka, S. Tapia San Martin, E.N. Telada, S. Tomaru, T. Tomigami, Y. 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa-City Chiba277-8582 Japan 1-1 Oho Tsukuba-City Ibaraki305-0801 Japan Earthquake Research Institute University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo113-0032 Japan 238 Higashi-Mozumi Kamioka-cho Hida-City Gifu Pref. Japan 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan 245 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of National Institute for Mathematical Sciences Yuseong-daero 1689 beon-gil 70 Daejeon Yuseong-gu34047 Korea Republic of Graduate School of Science Osaka University 1-1 Machikaneyama-cho Toyonaka-City Osaka560-0043 Japan 1-1 Oho Tsukuba-City Ibaraki305-0801 Japan Institute for Gravitational Research University of Glasgow Kelvin BuildingG12 8QQ United Kingdom Department of Applied Physics Fukuoka University Jonan Nanakuma Fukuoka814-0180 Japan Department of Physics Tamkang University No.151 Yingzhuan Rd. Danshui Dist. New Taipei-City25137 Taiwan Department of Physics Center for High Energy and High Field Physics National Central University No. 300 Zhongda Road Zhongyi District Taiyuan-City320 Taiwan Institute of Astronomy National Tsing Hua University No. 101 Kuang-Fu Road Section 2 Hsinchu30013 Taiwan Department of Physics National Tsing Hua University No. 101 Kuang-Fu Road Section 2 Hsinchu30013 Taiwan Department of Physics National Taiwan Normal University Sceince Campus National Taiwan Normal University Taipei116 Taiwan Univ. Grenoble Alpes Universite Savoie Mont Blanc CNRS IN2P3 AnnecyF-74941 France Department of Astronomy University of Tokyo 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan 2-21-1 Osawa Mitaka-City Tokyo181-8588 Japan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of

Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises caused by the thermal fluctuation. The mirror is suspended with the multi-stage pendulum to isolate any vibration. Therefore, this mirror suspension system has few heat links to reduce vibration injection. Thus, this system is mainly cooled down with thermal radiation. In order to understand the process of radiative cooling of the mirror, we analyzed cooling curve based on mass and specific heat. As a result, it was newly found that a cryogenic part called "cryogenic duct-shield"seems to have large contribution in the beginning of the mirror cooling. This finding will help to design new cooling system for the next generation cryogenic gravitational wave detector. © Published under licence by IOP Publishing Ltd.

关键词： Gravity waves

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Effective field theory for collective rotations and vibrations of triaxially deformed nuclei

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Physical Review C 2018年第6期97卷 064320-064320页

作者： Q. B. Chen N. Kaiser Ulf-G. Meißner J. Meng Physik-Department Technische Universität München D-85747 Garching Germany Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics and JARA-HPC Forschungszentrum Jülich D-52425 Jülich Germany State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Department of Physics University of Stellenbosch Stellenbosch South Africa

The effective field theory (EFT) for triaxially deformed even-even nuclei is generalized to include the vibrational degrees of freedom. The pertinent Hamiltonian is constructed up to next-to-leading order (NLO). The leading-order part describes the vibrational motion, and the NLO part couples rotations to vibrations. The applicability of the EFT Hamiltonian is examined through the description of the energy spectra of the ground state bands, γ bands, and K=4 bands in the Ru108,110,112 isotopes. It is found that, by taking into account the vibrational degrees of freedom, the deviations for high-spin states in the γ band observed in the EFT with only rotational degrees of freedom disappear. This supports the importance of including vibrational degrees of freedom in the EFT formulation for the collective motion of triaxially deformed nuclei.

关键词： Collective levels Effective field theory Nuclear structure & decays 90 ≤ A ≤ 149 Collective models Models based on symmetries

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Oxidation of benzalkonium chloride by gamma irradiation: kinetics and decrease in toxicity

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Journal of Radioanalytical and Nuclear Chemistry 2017年第3期312卷 631-637页

作者： Zibin Xu Xue Zhang Nan Huang Hong-ying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC) School of Environment Tsinghua University Beijing People’s Republic of China Shenzhen Laboratory of Microorganism Application and Risk Control Graduate School at Shenzhen Tsinghua University Shenzhen People’s Republic of China Collaborative Innovation Center for Advanced Nuclear Energy Technology Institute of Nuclear and New Energy Technology Tsinghua University Beijing People’s Republic of China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Institute Shenzhen People’s Republic of China

The gamma degradation of toxic non-oxidizing biocide dodecyl dimethyl benzyl ammonium chloride (DDBAC) was investigated. The degradation of DDBAC achieved 70–100% depending on the initial concentration and the absorbed dose, but only 10–33% dissolved organic carbon was removed. The presence of NO3 −, HCO3 −, 2-propanol and tert-butanol inhibited the degradation of DDBAC. The DDBAC degradation rate constant ratios of ·OH, ·H and e aq − was calculated as 7.4:1.4:1. The acute toxicity of 10 mg L−1 DDBAC was removed by 60% at absorbed doses of 0.5–3.0 kGy. The results showed that gamma irradiation was effective to remove DDBAC and its toxicity.

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Input optics systems of the KAGRA detector during O3GK

arXiv

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arXiv 2022年

作者： Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Asada, H. Aso, Y. Bae, S. Bae, Y. Baiotti, L. Bajpai, R. Barton, M.A. Cannon, K. Cao, Z. Capocasa, E. Chan, M. Chen, C. Chen, K. Chen, Y. Chiang, C.-I. Chu, H. Chu, Y.-K. Eguchi, S. Enomoto, Y. Flaminio, R. Fujii, Y. Fujikawa, Y. Fukunaga, M. Fukushima, M. Furuhata, T. Gao, D. Ge, G.-G. Ha, S. Hagiwara, A. Haino, S. Han, W.-B. Hasegawa, K. Hattori, K. Hayakawa, H. Hayama, K. Himemoto, Y. Hiranuma, Y. Hirata, N. Hirose, E. Hong, Z. Hsieh, B.-H. Huang, G.-Z. Huang, H.-Y. Huang, P. Huang, Y.-C. Huang, Y.-J. Hui, D.C.Y. Ide, S. Ikenoue, B. Imam, S. Inayoshi, K. Inoue, Y. Ioka, K. Ito, K. Itoh, Y. Izumi, K. Jeon, C. Jin, H.-B. Jung, K. Jung, P. Kaihotsu, K. Kajita, T. Kakizaki, M. Kamiizumi, M. Kanbara, S. Kanda, N. Kang, G. Kataoka, Y. Kawaguchi, K. Kawai, N. Kawasaki, T. Kim, C. Kim, J. Kim, J.C. Kim, W.S. Kim, Y.-M. Kimura, N. Kita, N. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A.K.H. Kotake, K. Kozakai, C. Kozu, R. Kumar, R. Kume, J. Kuo, C. Kuo, H.-S. Kuromiya, Y. Kuroyanagi, S. Kusayanagi, K. Kwak, K. Lee, H.K. Lee, H.W. Lee, R. Leonardi, M. Li, K.L. Lin, L.C.-C. Lin, C.-Y. Lin, F.-K. Lin, F.-L. Lin, H.L. Liu, G.C. Luo, L.-W. Majorana, E. Marchio, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyazaki, Y. Miyo, K. Miyoki, S. Mori, Y. Morisaki, S. Moriwaki, Y. Nagano, K. Nagano, S. Nakamura, K. Nakano, H. Nakano, M. Nakashima, R. Nakayama, Y. Narikawa, T. Naticchioni, L. Negishi, R. Nguyen Quynh, L. Ni, W.-T. Nishizawa, A. Nozaki, S. Obuchi, Y. Ogaki, W. Oh, J.J. Oh, K. Oh, S.H. Ohashi, M. Ohishi, N. Ohkawa, M. Ohta, H. Okutani, Y. Okutomi, K. Oohara, K. Ooi, C. Oshino, S. Otabe, S. Pan, K.-C. Pang, H. Parisi, A. Park, J. Pena Arellano, F.E. Pinto, I. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sakuno, Y. Sato, S. Sato, T. Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Research Center for the Early Universe The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute for Cosmic Ray Research KAGRA Observatory The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa City Chiba277-8582 Japan 1-1 Oho Tsukuba City Ibaraki305-0801 Japan Earthquake Research Institute The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo113-0032 Japan Department of Mathematics and Physics Graduate School of Science and Technology Hirosaki University 3 Bunkyo-cho Aomori Hirosaki036-8561 Japan Kamioka Branch National Astronomical Observatory of Japan 238 Higashi-Mozumi Kamioka-cho Gifu Hida City506-1205 Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Korea Institute of Science and Technology Information 245 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of National Institute for Mathematical Sciences 70 Yuseong-daero 1689 Beon-gil Yuseong-gu Daejeon34047 Korea Republic of International College Osaka University 1-1 Machikaneyama-cho Toyonaka City Osaka560-0043 Japan 1-1 Oho Tsukuba City Ibaraki305-0801 Japan Department of Astronomy Beijing Normal University Xinjiekouwai Street 19 Haidian District Beijing100875 China Department of Applied Physics Fukuoka University 8-19-1 Nanakuma Jonan Fukuoka Fukuoka City814-0180 Japan Department of Physics Tamkang University No. 151 Yingzhuan Rd. Danshui Dist. New Taipei City25137 Taiwan Department of Physics Institute of Astronomy National Tsing Hua University No. 101 Section 2 Kuang-Fu Road Hsinchu30013 Taiwan Department of Physics Center for High Energy and High Field Physics National Central University No.300 Zhongda

KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with the GEO 600 detector from April 7th - 21st, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kHz, whereas the laser intensity did not significantly limit the detector sensitivity. © 2022, CC BY.

关键词： Gravity waves

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