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Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Sawada, Keiji*; Takizuka, Tomonori; Kawashima, Hisato; Shimizu, Katsuhiro; Asakura, Nobuyuki
Plasma and Fusion Research (Internet), 4, p.025_1 - 025_7, 2009/08
The volume recombination in detached divertor plasmas is a key process to reduce the ion flux to the divertor plates. Two-dimensional measurement is one of the ways to investigate a spatial structure of the volume recombination. In this work, the deuterium Balmer-series lines from a detached divertor plasma were observed two-dimensionally with a spatial resolution of 1 cm and were reconstructed into two-dimensional emissivities with a tomography technique. The ratio of the D
to the D
emissivity was compared to that calculated by the collisional-radiative model. This ratio could not be explained only by the excitation of D by electron impact, indicating that the volume recombination contributed to the D emission. This is the case for the region above the inner strike point with 8 cm and 4 cm, respectively, in the r- and the z-direction on the poloidal cross-section.
Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Sawada, Keiji*; Takizuka, Tomonori; Shimizu, Katsuhiro; Kawashima, Hisato; Asakura, Nobuyuki
Plasma and Fusion Research (Internet), 2, p.S1121_1 - S1121_4, 2007/11
Understanding deuterium particle behavior in the divertor plasma is necessary to study the ionizing and recombining plasmas. Two-dimensional spectroscopic measurement of deuterium emission is useful to understand deuterium particle behavior in divertor plasmas. The information of the ionization and recombination can be obtained by measurement of deuterium Balmer-series lines. A wide-spectral-band spectrometer with a CCD detector was used to observe deuterium Balmer-series lines with two-dimensional spatial distribution in the JT-60U divertor region. From the measurement, we can obtain a two-dimensional distribution of D and D
using a computer tomography technique. The D emission was strong above the strike point in the inner divertor and around the strike point in the outer divertor. The D emission was strong above the strike point in the inner divertor.
Kamiya, Masayoshi; Koyama, Tomozo; Aoki, Kazuo*; Sawada, Kayo*
no journal, ,
no abstracts in English
Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Shimizu, Katsuhiro; Sawada, Keiji*; Kawashima, Hisato; Asakura, Nobuyuki
no journal, ,
no abstracts in English
Kamiya, Masayoshi; Koyama, Tomozo; Miura, Sachiko; Aoki, Kazuo*; Sawada, Kayo*
no journal, ,
Distribution coefficient of Am and relation between distribution coefficient of Am and concentration of nitric ion in high salt concentration and high acid concentration region, were given by the experiment using U, Pu, and Am nitric acid solution. The Extractant of this experiment is TBP.
Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Sawada, Keiji*; Takizuka, Tomonori; Kawashima, Hisato; Shimizu, Katsuhiro; Asakura, Nobuyuki
no journal, ,
The volume recombination in detached divertor plasmas is a key process to reduce the ion flux to the divertor plates. The deuterium Balmer-series lines (D
, D
, ..., D
) from a detached divertor plasma were observed two-dimensionally with a spatial resolution of about 1 cm and were reconstructed with a tomography technique. The ratio of the D to the D emissivity was compared to that calculated by the collisional-radiative model. This ratio could not be explained only by the excitation of D by electron impact, indicating that the volume recombination contributed to the D emission. This is the case for the region above the inner strike point with about 8 cm and 4 cm, respectively, in the r- and the z-direction on the poloidal cross-section. In this region, from the ratios of the D, D, ..., D emissivities, the electron density and temperature were evaluated to be about 1
10
m
and less than 0.3 eV, respectively.
Kamiya, Masayoshi; Sano, Yuichi; Miura, Sachiko; Koyama, Tomozo; Aoki, Kazuo*; Sawada, Kayo*
no journal, ,
Processing in high concentration condition is the feature of actinides co-extraction system with direct extraction process using supercritical fluid. Distribution coefficient of U and Pu obtained by experiment indicates that conventional empirical formula is applicable in this condition.
Koyama, Tomozo; Kamiya, Masayoshi; Aoki, Kazuo*; Sawada, Kayo*
no journal, ,
Actinides co-extraction system with direct extraction process using supercritical fluid is developed in JAEA. This report indicates over view of development.
Kamiya, Masayoshi; Miura, Sachiko; Sano, Yuichi; Koyama, Tomozo; Aoki, Kazuo*; Sawada, Kayo*
no journal, ,
The direct extraction test of the unirradiation MOX fuel was executed under ordinary pressure. If the composition of the solvent used was appropriate, it was able to be confirmed that not only U and Pu but also Am was extractive at the same time by TBP. It was suggested to have approved the extraction simultaneously on slight balances of the concentration of TBP, acid, and water in the solvent.
Watanabe, Takayoshi; Kawase, Keiichi; Sawada, Noriyoshi*
no journal, ,
no abstracts in English
