|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Observation of Impurity Accumulation After Hydrogen Multi-Pellet Injection in Large Helical Device显示文摘Impurity accumulation is studied for neutral beam-heated discharges after hydrogen multi-pellet injection in Large Helical Device (LHD).Iron density profiles are derived from radial profiles of EUV line emissions of FeXV-XXIV with the help of the collisional-radiative model.A peaked density profile of Fe23+ is simulated by using one-dimensional impurity transport code.The result indicates a large inward velocity of -6m/s at the impurity accumulation phase.However,the discharge is not entirely affected by the impurity accumulation,since the concentration of iron impurity,estimated to be 3.3×10-5 to the electron density,is considerably small.On the other hand,a flat profile is observed for the carbon density of C6+,which is derived from the Z eff profile,indicating a small inward velocity of -1m/s.These results suggest atomic number dependence in the impurity accumulation of LHD,which is similar to the tokamak result. | 董春凤 Shigeru MORITA Motoshi GOTO 王二辉 Gen MOTOJIAMA Izumi MURAKAMI Ryuichi SAKAMOTO Norimasa YAMAMOTO | 2013 | Plasma Science and Technology2013，15，3： | 0 |
| 2 | Edge and Core Impurity Transport Study With Spectroscopic Instruments in LHD显示文摘杂质运输与能测量杂质的一个维、二维的分布的发达分光镜的仪器在大螺旋状的设备(LHD ) 在边和核心区域被调查。边杂质行为最近用四碳被学习在 CIII (977 Å
) 的不同电离阶段的反响的转变, CIV (1548 Å
) , CV (40.3 Å
) 和 CVI (33.7 Å
) 。什么时候平均线的电子密度, n e , 从 1 ~ 6 ×被增加 10 13 厘米 −3, 比率(CIII+CIV )/n 当时, e 增加比率(CV+CVI )/n e 减少。这里, CIII+CIV (CV+CVI ) 表示 CIII (CV ) 和 CIV (CVI ) 的和紧张。CIII+CIV 显示碳流入, CV+CVI 在各态历经的层通过运输显示排出物。结果因此在在 LHD 由各态历经的层屏蔽的杂质上给试验性的证据,它被三维的边粒子模拟也支持。核心杂质行为也在高密度的分泌物被学习(n e ≤
1 × 10 15 厘米 −3) 与多 H 2-pellets 注射。它被发现 V/D 的比率(V:传送对流速度, D:散开系数) 在小团注射和 Z eff 侧面在价值显示出扁平的 1.1 1.2。这些结果证实没有杂质累积发生在高密度的分泌物。作为结果,铁密度, n Fe , 被分析是 6 × 10 −7(= n Fe /n 数量能甚至在如此的高密度的分泌物作为放射来源可以忽略的 e ) 。从解决空间的 VUV 和 EUV 分光计的一个维、二维的杂质分布最新发展了因为进一步的杂质运输学习也与他们的初步的结果被介绍。 | Shigeru MORITA Motoshi GOTO Masahiro KOBAYASHI Sadatsugu MUTO Malay Bikas CHOWDHURI 董春凤 周航宇 崔正英 Keisuke FUJII Akihiro FURUZAWA Masahiro HASUO AtsushiI WAMAE 揭银先 Mohammed KOUBITI Ikuya SAKURAI Yuzuru TAWARA 万宝年 吴振伟 Naohiro YAMAGUCHI | 2009 | Plasma Science and Technology2009，11，4： | 0 |
| 3 | Observation of Magnetic Dipole Forbidden Transitions in LHD and Its Application to Burning Plasma Diagnostics显示文摘Magnetic dipole forbidden (M1) transition was studied in large helical device (LHD)and F-, Si- and Ti-like M1 transitions are successfully observed for highly ionized Ar, Kr, Mo andXe ions. The wavelengths measured in visible range for the heavy elements, which are carefullydetermined with extremely small uncertainties of 0.02~0.05 A as a standard wavelength of usualelectric dipole (E1) plasma emissions, are compared with theoretical predictions. The result showsa good agreement with recent Hatree-Fock calculation including semi-empirical adjustment. TheM1 intensity for the F-like ions is examined by analyzing the intensity ratio of M1 to E1. Densitydependence of the ratio is experimentally verified by comparing with collisional- radiative modelcalculation on level population. The M1/E1 line ratio for the F-like ions is applied to the(He^(2+)) particle diagnostics in ITER, in which a steady-state operation of burning plasmas basedon D-T fusion reaction is expected with α particle heating. Unfortunately, the present estimationsuggests a negative result for the α particle measurement because the ratio is largely enhanced bythe collisional excitation with bulk ions due to high ion temperature of ITER of 10 keV as assumedand the resultant effect of the collisional excitation with α particles becomes less. Meanwhile, theM1 transition, in particular, Ti-like WLⅢ (W^(52+)) transition (3627 A) emitted in visible range,is very useful for diagnostics of the impurity behavior and the core plasma parameters in ITER. | Shigeru MORITA Motoshi GOTO Ryuji KATAI Chunfeng DONG Hiroyuki SAKAUE Hangyu ZHOU | 2010 | Plasma Science and Technology2010，12，3： | 0 |
| 4 | Improvement of Plasma Performance Using Carbon Pellet Injection in Large Helical Device显示文摘 | Shigeru MORITA Motoshi GOTO Kenichi NAGAOKA Chunfeng DONG Hangyu ZHOU Zhengying CUI Yunbo DONC Xiang GAO TKatsumi IDA Katsunori IKED Osamu KANEKO Shiyao LIN Haruhisa NAKANO Masaki OSAKABE Ryuichi SAKAMOTO Yasuhiko TAKEIRI Ang TI Katsuyoshi TSUMORI Mikiro YOSHINUMA LHD experiment group | 2011 | Plasma Science and Technology2011，13，3： | 0 |
| 5 | Spectroscopic Studies on Impurity Transport of Core and Edge Plasmas in LHD显示文摘Spectroscopic diagnostics have been extensively developed for studies of impurityand neutral particle transports at core and edge plasmas in LHD.Diagnostics of core plasmas aresimilar to a tokamak case,i.e.,Z_(eff)from visible bremsstrahlung,K-x-ray measurements from x-ray spectroscopy using Si(Li)detectors and a compact crystal spectrometer,and high-Z impuritydiagnostics from VUV spectroscopy using a flat-field EUV spectrometer.A combination of impu-rity pellet injection and visible bremsstrahlung is an active tool for determination of the diffusioncoefficient D and convective velocity V.Using this tool the spatial structures of D and V areobtained and discussed with a neoclassical effect.On the other hand,the spectroscopic methodfor edge diagnostics is considerably different from the tokamak case because of the existence of athick ergodic layer in addition to the x-points necessarily included into the diagnostic chord view.In order to break this negative situation,Zeeman and polarization spectroscopy are adopted toLHD edge plasmas.As a result,2-dimensional emission contours of HeI and H_α are successfullyobtained.Laser absorption spectroscopy is tried to measure hydrogen neutrals directly.Radialprofiles of edge impurities are also measured with a mirror-assembled 3 m VUV spectrometer.Recent results of and progress in LHD spectroscopy are briefly reviewed. | Shigeru MORITA Motoshi GOTO SadatsuguMUTO Ryuji KATAI Hisamichi YAMAZAKI Hideaki NOZATO AtsuslliI WAMAE Makoto ATAKE Takashi FUJIMOTO Atsushi SAKAUE Hiroaki NISHIMURA Ikuya SAKURAI Chiho MATSUMOTO Akihiro FURUZAWA Yuzuru TAWARA Mitsutoshi ARAMAKI Yuji OKUMURA Koichi SASAKI 龚先祖 李建刚 万宝年 崔正英 | 2006 | Plasma Science and Technology2006，8，1： | 0 |
| 6 | Study on Radial Position of Impurity Ions in Core and Edge Plasma of LHD Using Space-Resolved EUV Spectrometer显示文摘Radial profiles of impurity ions of carbon, neon and iron were measured for hightemperatureplasmas in large helical device (LHD) using a space-resolved extreme ultraviolet(EUV) spectrometer in the wavelength range of 60 A to 400 A. The radial positions of the impurityions obtained are compared with the local ionization energies, E_1 of these impurity ions and theelectron temperatures T_(ez) there. The impurity ions with 0.3 keV ≤ E_i≤ 1.0 keV are alwayslocated in outer region of plasma, i.e., 0.7≤ p≤ 1.0, and those with E_i <0.3 keV are located inthe ergodic layer, i.e., 1.0 ≤ p ≤ 1.1, with a sharp peak edge, where p is the normalized radialposition. It is newly found that T_(ez) is approximately equal to E_i for the impurity ions withE_i≤ 0.3 keV, whereas roughly half the value of E_i for the impurity ions with 0.3 keV ≤ E_i ≤1.0 keV. It is known that T_(ez) is considerably lower than E_i in the plasma edge and approachesto E_i in the plasma core. Therefore, this result seems to originate from the difference in thetransverse transport between the plasma edge at p ≤1.0 and the ergodic layer at p ≥ 1.0. Thetransverse transport is studied with an impurity transport simulation code. The result revealedthat the difference appearing in the impurity radial positions can be qualitatively explained bythe different values of diffusion coefficient, e.g., D = 0.2 m^2/s and 1.0 m^2/s, which can be takenas a typical index of the transverse transport. | 董春风 Shigeru MORITA Motoshi GOTO Masahiro KOBAYASH | 2011 | Plasma Science and Technology2011，13，2： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员