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您的检索式：作者名="Ryuji KATAI"
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| 1 | 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 |
| 2 | 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 |
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