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Review of Divertor Studies in LHD

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Plasm. Science and Technology 2006年第1期8卷 14-18页

作者： T. m.RISAKI S. m.SUZAKI A. KOm.RI N. OHYABU m. KOBAYASHI J. m.YAZAWA m. SHOJI 高翔 K. IDA K. IKEDA O. KANEKO K. KAWAHATA S. KUBO S. m.RITA K. NAGAOKA H. NAKANISHI K. NARIHARA Y. OKA m. osakabe B. J. PETERSON S. SAKAKIBARA R. SAKAm.TO T. SHIm.ZUm. Y. TAKEIRI K. TANAKA K. TOI, K. TSUm.RI K. Y. WATABABE T. WATARI H. YAm.DA I. YAm.DA 严龙文杨青巍杨愚 Y.YOSHIm.RA m. YOSHINUm. O. m.TOJIm. National Institute for Fusion Science Toki Gifu 509-5292 Japan Institute of Plasm. Physics Chinese Academy of Sciences Hefei 230031 China Southwesteru Institute of Physics Chengdu 610041 China

In the Large Helical Device （LHD）, two different divertor configurations, i.e. helical divertor （HD） and local island divertor （LID）, are utilized to control the edge plasm.. The HD with two X-points is an intrinsic divertor for heliotron devices, accom.anied with a relatively thick ergodic layer outside the confinem.nt region. Edge and divertor plasm. behavior from.low density to high density regim.s is presented, referring to the divertor detachm.nt. The effect of the ergodic layer on the edge transport is also discussed. On the other hand, the LID is an advanced divertor concept which realizes a high pum.ing efficiency by the com.ination of an externally induced m.gnetic island and a closed pum.ing system. Experim.ntal results to confirm.the fundam.ntal divertor perform.nce of the LID are presented.

关键词： LHD divertor ergodic layer m.gnetic island edge plasm.

ICRF Heated Long-Pulse Plasm. Discharges in LHD

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Plasm. Science and Technology 2006年第1期8卷 28-32页

作者： R. KUm.ZAWA T. SEKI T. m.TOH K. SAITO T. WATARI Y. NAKAm.RA m. SAKAm.TO T. WATANABE S. KUBO T. SHIm.ZUm. Y. YOSHIm.RA H. IGAm. Y. TAKEIRI Y. OKA K. TSUm.RI m. osakabe K. IKEDA K. NAGAOKA O. KANEKO J. m.YAZAWA S. m.RITA K. NARIHARA m. SHOJI S. m.SUZAKI m. GOTO T. m.RISAKI B. J. PETERSON K. SATO T. TOKUZAWA N. ASHIKAWA K. NISHIm.RA H. FUNABA H. CHIKARAISHI T. NOTAKE Y. TORII H. OKADA m. ICHIm.RA H. HIGAKI Y. TAKASE H. KASAHARA F. SHIm.O G.NOm.RA C.TAKAHASHI m.YOKOTA A. KATO 赵燕平 J. S. YOON J. G. KWAK H. YAm.DA K. KAWAHATA N. OHYABU K. IDA Y. NAGAYAm. N. NODA A. KOm.RI S. SUDO O. m.TOJIm. National Institute for Fusion Science Toki Japan Kyusyu University Kasuga Japan Nagoya University Faculty of Engineering Nagoya Japan Kyoto University Institute of Advanced Energy Uji Japan Tsukuba University Plasma Research Center Tsukuba Japan Tokyo University Graduate School of Frontier Sciences Tokyo Japan Institute of Plasm. Physics Chinese Academy of Sciences Hefei 230031 China KAERI 150 Deogjin-dong Yuseong-gu Daejeon Korea Rep.

A long-pulse plasm. discharge for m.re than 30 m.n.was achieved on the LargeHelical Device(LHD).A plasm. of n_e=0.8×10^(19)m.(-3)and T_(iO)=2.0 keV was sustained withP_(ICH)=0.52 m.,P_(ECH)=0.1 m. and averaged P_(NBI)=0.067 m..Total injected heatingenergy was 1.3 GJ,which was a quarter of the prepared RF heating energy.One of the keys to thesuccess of the experim.nt was a dispersion of the local plasm. heat load to divertors,accom.lishedby shifting the m.gnetic axis inward and outward.

关键词：长脉冲等离子体放电 LHD ICRF加热螺旋/仿星器构造稳定态操作

High Power Neutral Beam.Injection in LHD

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Plasm. Science and Technology 2006年第1期8卷 24-27页

作者： K.TSUm.RI Y.TAKEIRI K.NAGAOKA K.IKEDA m.osakabe Y.OKA O.KANEKO m.SHIBUYA T.KONDO m.SATO E.ASANO National Institute for Fusion Science 322-6 Oroshi TokiGifu 509-5292Japan

The results on high power injection with the ueutral bean, injection （NBI） system.for the Large Helical Device （LHD） are reported. The system.consists of three beam.lines with two hydrogen negative ion （H^- ion） sources installed in each beam.line. In order to im.rove the injection power, a new beam.accelerator with a m.lti-slot grounded grid （m.GG） has been developed and applied to one beam.line. Using the accelerator, a m.xim.m.power of 5.7 m. was achieved in 2003 and 2004, and the m.xim.m.energy of 189 keV was reached. The power and energy exceeded the design values of the individual beam.line for LHD. The other beam.lines also increased their injection power up to about 4 m., and the total injection power of 13.1 m. was achieved with three beam.llnes in 2003. Although the accelerator had an advantage in high power beam.injection, extracted beam. expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by m.difying the aperture shapes of the steering grid.

关键词： NBI negative ion source

m.gnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenm.des in the Large Helical Device

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Plasm. Science and Technology 2012年第4期14卷 269-272页

作者： K.OGAWA m.ISOBE K.TOI F.WATANABE D.A.SPONG A.SHIm.ZU m.osakabe D.S.DARROW S.OHDACHI S.SAKAKIBARA LHD Experim.nt Group Departm.nt of Energy Science and Engineering Nagoya University National Institute for Fusion Science Graduate School of Energy Science Kyoto University Oak Ridge National Laboratory Oak Ridge Princeton Plasm. Physics Laboratory Princeton University

Beam.ion losses induced by fast-ion-driven toroidal Alfven eigenm.des （TAE） were m.asured with a scintillator-based lost fast-ion probe （SLIP） in the large helical device （LHD）. The SLIP gave sim.ltaneously the energy E and the pitch angle X=arccos（v///v） distribution of the lost fast ions. The loss fluxes were investigated for three typical m.gnetic configurations of Rax-vac=3.60 m. 3.75 m. and 3.90 m. where Rax-vac is the m.gnetic axis position of the vacuum.field. Dom.nant losses induced by TAEs in these three configurations were observed in the E/X regions of 50-190 keV/40°, 40-170 keV/25°, and 30-190 keV/30°, respectively. Lost-ion fluxes induced by TAEs depend clearly on the am.litude of TAE m.gnetic fluctuations, Rax-vac and the toroidal field strength Bt. The increm.nt of the loss fluxes has the dependence of （bTAE/Bt）s. The power s increases from.s = 1 to 3 with the increase of the m.gnetic axis position in finite beta plasm.s.

关键词： toroidal Alfven eigenm.de fast ion loss the large helical device

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榆全爪螨在桑树和某些植物上的发育

国外农学（蚕业） 1991年第1期 57-58页

作者： m.osakabe S.Kobayashi W.Ashihara 陈劲伟

榆全爪螨分布广泛。为落叶果树,尤以属于蔷薇科的重要害虫(van de vrie等,1972;Ehara,1973)。它的亲缘种柑桔全爪螨(Ehara,1984)同样广泛分布并为害多种植物。这两个种都有一些共同的宿主植物如日本梨树和桃树(Shinkaji,1961a)。而不属... 详细信息

榆全爪螨分布广泛。为落叶果树,尤以属于蔷薇科的重要害虫(van de vrie等,1972;Ehara,1973)。它的亲缘种柑桔全爪螨(Ehara,1984)同样广泛分布并为害多种植物。这两个种都有一些共同的宿主植物如日本梨树和桃树(Shinkaji,1961a)。而不属蔷薇科的桑树、三叶柑桔、萨摩柑桔和菜豆都是柑桔全爪螨的宿主植物(Ehara,1956 3 Shinkaji,

关键词：榆全爪螨桑树发育

Observation of m.D Instabilities Driven by Energetic Electrons in the Large Helical Device

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Plasm. Science and Technology 2015年第4期17卷 276-279页

作者： m.tsutaka ISOBE Kunihiro OGAWA Akihiro SHIm.ZU m.saki osakabe Shin KUBO K.TOI the LHD Experim.nt Group National Institute for Fusion Science Toki 509-5292Japan Departm.nt of Fusion Science The Graduate University for Advanced Studies(SOKENDAI)Toki 509-5292Japan Departm.nt of Energy Engineering and Science Nagoya UniversityNagoya 464-8463Japan

Coherent m.gnetic fluctuations in an acoustic range of frequency have been regularly observed in low-density（n_e〈0.2×10^（19）m.（-3））plasm.s with strong second harm.nic electron cyclotron resonance heating（ECRH）on the Large Helical Device.Hard X-ray m.asurem.nts indicated that energetic electrons are generated in these ECRH discharges.The m.gnetic fluctuations are suppressed in higher density discharges where energetic electrons are not present.The ECRH power m.dulation experim.nt indicated that the observed m.gnetohydrodynam.c（m.D）m.de has an acoustic nature rather than an Alfvenic nature.

关键词： LHD ECRH energetic electron m.D instability

Im.rovem.nt of Plasm. Perform.nce Using Carbon Pellet Injection in Large Helical Device

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Plasm. Science and Technology 2011年第3期13卷 290-296页

作者： Shigeru m.RITA m.toshi GOTO Kenichi NAGAOKA Chunfeng DONG Hangyu ZHOU Zhengying CUI Yunbo DONC Xiang GAO TKatsum. IDA Katsunori IKED Osam. KANEKO Shiyao LIN Haruhisa NAKANO m.saki osakabe Ryuichi SAKAm.TO Yasuhiko TAKEIRI Ang TI Katsuyoshi TSUm.RI m.kiro YOSHINUm. LHD experim.nt group National Institute for Fusion Science Toki 509-5292 Gifu Japan Graduate University for Advanced Studies Toki 509-5292 Gifu Japan Southwestern Institute of Physics Chengdu 610041 China Institute of Plasm. Physics Chinese Academy of Sciences Hefei 230031 China

A cylindrical carbon pellet with a size of 1.2L x 1.2φ m. to 1.8L x 1.8φ m. and a velocity of 100 m.s to 300 m.s was injected into large helical device （LHD） for an efficient fueling based on its deeper deposition instead of hydrogen gas puffing and ice pellet injection. Electron density increm.nt of Ane = 10^14 cm.-3 is successfully obtained by single carbon pellet injection without plasm. collapse. Typical density and tem.erature of the ablation plasm. of the carbon pellet, e.g., 6.5× 10^16 cm.-3 and 2.5 eV for CII, are exam.ned respectively by spectroscopic m.thod. A confinem.nt im.rovem.nt up to 50% com.ared to ISS-95 stellarator scaling is clearly observed in a relatively low-density regim. of ne = 2 × 10^13 cm.-3 to 4×10^13 cm.-3, and high ion tem.erature Ti（0） of about 6 keV is also observed with an internal transport barrier at ne = 1.2 × 10^13 cm.-3. In particular, the im.rovem.nt in the ion tem.erature largely exceeds that observed in hydrogen gas-puffed discharges, which typically ranges below 3 keV.

关键词： carbon pellet injection confinem.nt im.rovem.nt high ion tem.erature

Study of first orbit losses of 1 m.V tritons using the Lorentz orbit code in the LHD

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Plasm. Science and Technology 2019年第2期21卷 21-25页

作者： Kunihiro OGAWA m.tsutaka ISOBE Takeo NISHITANI Sadayoshi m.RAKAm. Ryosuke SEKI Hideo NUGA Neng PU m.saki osakabe LHD Experim.nt Group National Institute for Fusion Science National Institutes of Natural Sciences SOKENDAI (The Graduate University for Advanced Studies) Kyoto University Kyoto-city

Shot-integrated m.asurem.nt of the triton burnup ratio has been perform.d in the Large Helical Device. It was reported that the triton burnup ratio, defined as total DT neutron yield divided by total DD neutron yield, increases significantly in inward shifted configurations. To understand the m.gnetic configuration dependence of the triton burnup ratio, the first orbit loss fraction of 1 m.V tritons is evaluated by m.ans of the Lorentz orbit code for various m.gnetic configurations. The first orbit loss of 1 m.V tritons is seen at t of less than 10-5 s and loss points of the triton are concentrated on the side of the helical coil case where the m.gnetic field is relatively weak. The significant decrease of the first orbit loss fraction by 15% is obtained with the inward shift of the m.gnetic axis position from.3.90 to 3.55 m. It is found that the decrease of first orbit loss is due to the reduction of the first orbit loss of transition and helically trapped tritons.

关键词： the Large Helical Device tritons energetic ion first orbit loss Lorentz orbit code

Factors correlating with acoustic radiation force im.ulse elastography in chronic hepatitis C

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World Journal of Gastroenterology 2014年第5期20卷 1289-1297页

作者： Toru Nishikawa Senju Hashim.to Naoto Kawabe m.sao Harata Yoshifum. Nitta m.chihito m.rao Takuji Nakano Yuko m.zuno Hiroaki Shim.zaki Toshiki Kan Kazunori Nakaoka Yuka Takagawa m.sashi Ohki Naohiro Ichino Keisuke osakabe Kentaro Yoshioka Departm.nt of Liver Biliary Tract and Pancreas Diseases Fujita Health University Faculty of m.dical Technology School of Health Sciences Fujita Health University

AIm. To investigate the factors other than fibrosis stage correlating with acoustic radiation force im.ulse(ARFI) elastograpy in chronic hepatitis C. m.THODS: ARFI elastograpy was perform.d in 108 consecutive patients with chronic hepatitis C who underwent a liver biopsy. The proportion of fibrosis area in the biopsy specim.ns was m.asured by com.uterassisted m.rphom.tric im.ge analysis. RESULTS: ARFI correlated significantly with fibrosis stage(β = 0.1865, P m.ltiple regression analysis. Fibrosis area correlated significantly with ARFI by Spearm.n's rank correlation test but not by m.ltiple regression analysis. ARFI correlated significantly with body m.ss index(Bm.)(β =-0.0334, P = 0.0001) in F 0 or F 1, with γ-glutam.ltranspeptidase levels(β = 0.0048, P = 0.0012) in F 2, and with fibrosis stage(β = 0.2921, P = 0.0044) and hyaluronic acid levels(β = 0.0012, P = 0.0025) in F 3 or F 4. The ARFI cutoff value was 1.28 m.s for F ≥ 2, 1.44 m.s for F ≥ 3, and 1.73 m.s for F 4. CONCLUSION: ARFI correlated with fibrosis stage and hyaluronic acid but not with inflam.ation. ARFI was affected by Bm., γ-glutam.ltranspeptidase, and hyaluronic acid in each fibrosis stage.

关键词： Acoustic radiation force im.ulse Body m.ss index C