Search Results 1-20 of 1039

  • 中性子集光用高精度Wolterミラーマンドレルの作製(第7報):PCVM加工における熱流入由来の加工量誤差の補正  [in Japanese]

    Arakawa Shohei , Yamamoto Yugo , Kawai Kentaro , Arima Kenta , Yamazaki Dai , Maruyama Ryuji , Hayashida Hirotoshi , Soyama Kazuhiko , Yamamura Kazuya

    <p>我々は大気圧マイクロ波プラズマジェットを用いたNC-PCVMによる,中性子顕微鏡用Wolterミラーの作製に取り組んでいる.PCVMは化学的な加工法であるため,加工速度は表面温度に依存する.マンドレルは先細り形状の合成石英棒であるため,プラズマ照射時の温度上昇は先端ほど大きく,加工速度の上昇分を照射時間で補正する必要がある.本報ではプラズマの照射時間補正後にマンドレルを形状修正し …

    Proceedings of JSPE Semestrial Meeting 2019A(0), 695-695, 2019

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  • High Power LPP-EUV Source with Long Collector Mirror Lifetime for Semiconductor High Volume Manufacturing

    Mizoguchi Hakaru , Soumagne Georg , Yamada Tsuyoshi , Saitou Takashi , Nakarai Hiroaki , Abe Tamotsu , Tanaka Hiroshi , Watanabe Yukio , Hori Tsukasa , Kodama Takeshi , Shiraishi Yutaka , Yanagida Tatsuya

    … −0.6%/Gpls with 125 W average was demonstrated during 30 Mpls with mirror test.</p><p> Furthermore, in 2018 ASML reported they succeeded 250 W operation with NXE3350 system achieved 125 WPH throughput not only in laboratory but also several customer site. … We have already started feasibility study of higher conversion efficiency, higher driver laser power and improvement of capping layer of collector mirror. …

    Journal of Photopolymer Science and Technology 32(1), 77-86, 2019

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  • Characteristics of Upstream and Downstream Plasma Parameters from Langmuir Probes and Visible Spectrometers in the D-Module of GAMMA 10/PDX

    IIJIMA Takaaki , NAKASHIMA Yousuke , HARA Toshiki , NOJIRI Kunpei , TERAKADO Akihiro , ISLAM Md. Shahinul , YOSHIMOTO Tsubasa , YAMASHITA Sotaro , EZUMI Naomichi , SAKAMOTO Mizuki

    … <p>Plasma parameters in the upstream and downstream regions in the divertor simulation experimental module (D-module) of the tandem mirror plasma device GAMMA 10/PDX were conducted using Langmuir probes. … The detached plasma was produced using hydrogen puffing. …

    Plasma and Fusion Research 14(0), 2401156-2401156, 2019

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  • Simulation Study of Neutral Beam Injection Heating in the HSX Plasma

    MORISHITA Yuya , MURAKAMI Sadayoshi , LIKIN Konstantin , ANDERSON David T.

    … <p>The Neutral Beam Injection (NBI) heating efficiency for the Helically Symmetric Experiment (HSX) plasma is studied by applying two simulation codes: HFREYA and GNET. … HFREYA is employed to evaluate the birth profiles of the fast ions by the NBI into the plasma. … We also find that no clear difference can be seen in the heat depositions between the QHS and Mirror configurations. …

    Plasma and Fusion Research 14(0), 3403152-3403152, 2019

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  • EUV light generation using laser induced Sn plasma for semiconductor high volume manufacturing  [in Japanese]

    MIZOGUCHI Hakaru , KODAMA Takeshi , YANAGIDA Tatsuya , SAITOU Takashi

    <p>半導体の微細化の進展とともに光リソグラフィ光源の短波長化が進んできた.KrF,ArF,ArF液浸,マルチパターニングと進展し,10nm以下のデザイン寸法では極端紫外線(EUV)波長でのリソグラフィが熱望されてきた.近年,光源の性能改善が進み半導体製造現場での250W運転の成功も報告され,ロジックデバイス製造メーカを中心にEUV露光装置の導入が大きく進展している.本稿では,昨今の世 …

    Oyo Buturi 88(1), 41-45, 2019

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  • Future Perspectives and Status of Magnetic Mirror Studies in Novosibirsk

    IVANOV Alexandr , BAGRYANSKY Petr , BURDAKOV Alexander , YAKOVLEV Dmitri

    … <p>In the paper, we present the Budker Institute long term plans for development of the plasma physics database for an advanced fuel fusion reactor based on the axisymmetric linear magnetic trap. … To develop the required database a stepwise approach is applied, which suggests construction of the several experimental devices with progressively increased plasma parameters, which incorporate the different constituents of the approach.</p> …

    Plasma and Fusion Research 14(0), 2402139-2402139, 2019

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  • Prototype of a Quasi-Optical Launcher System of a 4 mm Round-Trip Interferometer for the QUEST Spherical Tokamak Experiments

    YUNOKI Miu , IDEI Hiroshi , NAKAMURA Kazuo , FUKUYAMA Masaharu , ASHIDA Ryuichi , OGATA Daichi , ONCHI Takumi , IKEZOE Ryuya , YOSHIKAWA Masayuki

    <p>A launcher system for a round-trip interferometer, with a corrugated horn antenna and two quasi-optical mirrors, has been developed for the QUEST spherical tokamak experiment. The corrugated …

    Plasma and Fusion Research 14(0), 3402122-3402122, 2019

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  • Estimation of the <i>j </i>× <i>B </i>Force Produced by Electron Cyclotron Heating in HSX Plasma

    YAMAMOTO Yasuhiro , MURAKAMI Sadayoshi , CHANG Ching-Chieh , KUMAR Santhosh T.A. , TALMADGE Joseph N. , LIKIN Konstantin , ANDERSON David T.

    … <p>The force related to electron cyclotron heating (ECH) is investigated in HSX plasma. … Radial diffusion of energetic electrons by ECH produces a canceling return current, which then generates a <i>j </i>× <i>B </i>force that can play an important role in the toroidal rotation during ECH in HSX plasma. …

    Plasma and Fusion Research 14(0), 3403105-3403105, 2019

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  • Peripheral Technology and Future Prospects of Ultraprecision/Micro Machining  [in Japanese]

    SHAMOTO Eiji

    Journal of the Japan Society for Precision Engineering 85(7), 609-612, 2019

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  • Effect of High Ion Temperature on the Polytropic Coefficient in the End Region of GAMMA 10/PDX

    NOJIRI Kunpei , TAKIZUKA Tomonori , OGAWA Yuichi , NAKASHIMA Yousuke , SAKAMOTO Mizuki , EZUMI Naomichi , TOGO Satoshi , IIJIMA Takaaki , JANG Seowon , TERAKADO Akihiro , KINOSHITA Yosuke , HARA Toshiki

    … <p>The effect of high ion temperature on the ion polytropic coefficient (<i>γ</i>) was experimentally investigated in the end region of the GAMMA 10/PDX tandem mirror. … The ion temperature parallel to the magnetic field (<i>T</i><sub>i||</sub>) was varied using the ion cyclotron range of frequencies (ICRF) waves, which heat the plasma in the central cell, and by applying an additional gas puff in the central cell. …

    Plasma and Fusion Research 14(0), 2401086-2401086, 2019

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  • Mechanical Design and Structural Analysis for Lower Port Optics of ITER Divertor Impurity Monitor

    MARUYAMA Toshiyuki , OIKAWA Toshihiro , KITAZAWA Sin-iti , IOKI Kimihiro , MERA Saori , NOMURA Ikuma , OGAWA Hiroaki , TANAKA Suguru , HATAE Takaki

    … The mechanical design of the optics forms a box-shaped optics and the structural analysis results indicate the mirror box satisfies design criteria in the RCC-MR code, except for the inner support part interfacing with the divertor cassette.</p> …

    Plasma and Fusion Research 14(0), 3405080-3405080, 2019

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  • Analysis of Ar Impurity Transport in the Large Tandem Mirror Device GAMMA 10/PDX Plasmas

    TAKECHI Sayuri , TATSUMI Ryoko , ISLAM Md. Shahinul , HOSHINO Kazuo , HATAYAMA Akiyoshi , NAKASHIMA Yousuke

    <p>The purpose of this study is to understand the Ar impurity transport process in the GAMMA 10/PDX. In the present study, the initial simulation using LINDA code and IMPGYRO code has been done …

    Plasma and Fusion Research 14(0), 2403045-2403045, 2019

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  • Ray Trace Study for Visible Spectroscopy Reference System (VSRS) Diagnostics in ITER

    KAJITA Shin , DE BOCK Maarten , DESJARDINS Michel , BARNSLEY Robin

    … <p>The visible spectroscopy reference system (VSRS) diagnostic will be used to measure the continuum visible light emitted from the plasma in ITER. … We investigated the influences of the reflection property of the retroreflector and first mirror for the signal and stray light intensity.</p> …

    Plasma and Fusion Research 14(0), 1405042-1405042, 2019

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  • Code Development for Calculating Electron Beams in the Cavities of the Future High-Power Gyrotrons

    NUMAKURA Tomoharu , KARIYA Tsuyoshi , MINAMI Ryutaro , OKADA Maki , HOJO Toshitaka , MOTOYOSHI Fumiya , IMAI Tsuyoshi

    … The effects of fluctuations of the intense electron flows in nonuniform magnetic fields are studied in a 1 MW gyrotron for electron cyclotron resonance plasma heating and current drive in large devices, such as the tandem mirror plasma device GAMMA10/PDX and the Large Helical Device (LHD). …

    Plasma and Fusion Research 14(0), 2405052-2405052, 2019

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  • Generation and Measurement of High Intermittent Heat Flux in GAMMA 10/PDX

    MINAMI Ryutaro , ENDO Yoichi , NAKASHIMA Yousuke , KARIYA Tsuyoshi , IMAI Tsuyoshi , NUMAKURA Tomoharu , OKADA Maki , HOJO Toshitaka , MOTOYOSHI Fumiya , YABUSA Takuya , HIMENO Nao

    … In this study,a new mirror antenna is developed to generate higher heat flux and concentrate the heating power on the axis. … The energy density and heat flux obtained using previous systems are 0.06 MJ/m2 and 11.4 MW/m2, respectively,and those obtained using the new mirror systems are 0.09 MJ/m2 and 30 MW/m2, respectively. …

    Plasma and Fusion Research 14(0), 2402034-2402034, 2019

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  • Studies of Plasma Confinement and Stability in a Gas Dynamic Trap: Results of 2016 - 2018

    BAGRYANSKY Peter A. , MURAKHTIN Sergey V. , PINZHENIN Egor I. , PRIKHODKO Vadim V. , SAVKIN Valery Ya. , SHALASHOV Alexander G , SKOVORODIN Dmitry I. , SOLDATKINA Elena I. , SOLOMAKHIN Alexander L. , YAKOVLEV Dmitry V. , GOSPODCHIKOV Egor D. , IVANOV Alexander A. , LIZUNOV Andrey A. , KOLESNIKOV Evgeny Yu. , KONSHIN Zahar E. , KOROBEYNIKOVA Olga A. , KOVALENKO Yury V. , MAXIMOV Vladimir V.

    … These studies were focused on the experimental substantiation of a new version of the Gas Dynamic Multi-mirror Trap project, which is aimed at developing the key technologies needed to implement a number of thermonuclear applications of linear magnetic traps. … The paper reviews the work aimed at stable plasma confinement under auxiliary ECR heating. …

    Plasma and Fusion Research 14(0), 2402030-2402030, 2019

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  • Effect of the Potential of Confined Plasma on End-Loss Ion in GAMMA 10/PDX

    JANG Seowon , SEKINE Ryo , KAYANO Hiroki , NAKASHIMA Yousuke , ICHIMURA Makoto , HIRATA Mafumi , IKEZOE Ryuya , SAKAMOTO Mizuki , SUMIDA Shuhei , IZUMI Koki , TANAKA Atsuto , KUBOTA Yushi

    … In the GAMMA 10/PDX tandem mirror, studies on divertor physics have been performed in the west end region by utilizing end-loss plasmas flowing from the confinement region. … Since the plasma density in the end region is quite low (∼1016 m−3), an increase of the end-loss ion flux is required. …

    Plasma and Fusion Research 14(0), 2402032-2402032, 2019

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  • Sensitivity Check of Background Plasma Parameter during SMBI in the GAMMA 10 Central-Cell by 3-D Monte-Carlo Simulations

    ISLAM Md. Maidul , KOBAYASHI Shinji , NISHINO Nobuhiro , ISLAM Md. Shahinul , IIJIMA Takaaki , YOSHIKAWA Masayuki , KOHAGURA Junko , SHOJI Mamoru , NAKASHIMA Yousuke

    … <p>The gas fueling by supersonic molecular beam injection (SMBI) has been carried out in the world largest tandem mirror device GAMMA 10 and higher plasma density has been achieved compared with conventional gas-puffing. … In this paper the simulation is carried out in the different profiles of electron temperature in order to check the sensitivity of the background plasma parameter. …

    Plasma and Fusion Research 14(0), 2403017-2403017, 2019

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  • Spatiotemporal Structure of Hα Emission from the Detached Plasma in GAMMA 10/PDX

    TANAKA Hirohiko , KOHAGURA Junko , OHNO Noriyasu , SAKAMOTO Mizuki , EZUMI Naomichi , TERAKADO Akihiro , NOJIRI Kunpei , MIKAMI Tomohiro , KINOSHITA Yosuke , KOBAYASHI Kaede , YOSHIKAWA Masayuki

    … <p>High-speed camera measurement was performed for analyses of detached plasma fluctuation in the GAMMA 10/PDX tandem mirror device. …

    Plasma and Fusion Research 14(0), 2402036-2402036, 2019

    IR  J-STAGE 

  • First Experimental Campaign on SMOLA Helical Mirror

    SUDNIKOV Anton V. , MELNIKOV Nikita A. , BEKLEMISHEV Aleksey D. , POSTUPAEV Vladimir V. , IVANOV Ivan A. , INZHEVATKINA Anna A. , SKLYAROV Vladislav F. , BURDAKOV Aleksandr V. , KUKLIN Konstantin N. , ROVENSKIKH Andrey F.

    … <p>Experimental evidence of the plasma flow suppression by the helical magnetic mirror is presented. … Reported experiments were done during the first plasma campaign in the SMOLA helical mirror device at self-consistent floating potentials of all in-vessel electrodes and at minimal magnetic fields suitable for confinement regime. …

    Plasma and Fusion Research 14(0), 2402023-2402023, 2019

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