Search Results - "Masuzaki, S"

Transition between Isotope-Mixing and Nonmixing States in Hydrogen-Deuterium Mixture Plasmas by Ida, K, Nakata, M, Tanaka, K, Yoshinuma, M, Fujiwara, Y, Sakamoto, R, Motojima, G, Masuzaki, S, Kobayashi, T, Yamasaki, K

“…The transition between isotope-mixing and nonmixing states in hydrogen-deuterium mixture plasmas is observed in the isotope (hydrogen and deuterium) mixture…”
Get full text

Analysis of mixed-material layers deposited on the toroidal array probes during the FY 2012 LHD plasma campaign by Alimov, V.Kh, Yajima, M., Masuzaki, S., Tokitani, M.

“…•Ten Si probes were located on the outer side of the LHD first-wall surface in each 36° toroidal section.•During the 16th plasma campaign, mixed-material…”
Get full text

Application of the Advanced Multi-Step Brazing for fabrication of the high heat flux component by Tokitani, M., Hamaji, Y., Hiraoka, Y., Masuzaki, S., Tamura, H., Noto, H., Tanaka, T., Muroga, T., Sagara, A.

“…A novel fabrication method for a divertor heat removal component with tungsten (W) armour and copper alloy heat sink was newly developed and named as the…”
Get full text

Development of the brazing technique of W and JLF-1 by Ni-P filler material by Yamashita, T., Tokitani, M., Hamaji, Y., Noto, H., Masuzaki, S., Muroga, T.

“…The reliable bonding between tungsten (W) and reduced activation ferritic/martensitic (RAFM) steel (JLF-1) was obtained by brazing with BNi-6 (Ni-11%P) filler…”
Get full text

Ultrahigh neutral pressures in the sub-divertor of the Large Helical Device by Wenzel, U., Motojima, G., Kobayashi, M., Goto, M., Hayashi, Y., Masuzaki, S., Kawamura, G., Jagielski, B., Haak, V.

“…Abstract In the Large Helical Device (LHD) a low temperature mode (LTM) of the helical divertor was discovered. It combines particle detachment and very large…”
Get full text

Boiling incipience of subcooled water flowing in a narrow tube using wavelet analysis by Shibahara, M., Fukuda, K., Liu, Q.S., Hata, K., Masuzaki, S.

“…•Incipient boiling phenomena of subcooled water in a narrow tube were observed.•The boiling signal was analyzed by the wavelet decomposition method.•The…”
Get full text

Observation of a reduced-turbulence regime with boron powder injection in a stellarator by Nespoli, F., Masuzaki, S., Tanaka, K., Ashikawa, N., Shoji, M., Gilson, E. P., Lunsford, R., Oishi, T., Ida, K., Yoshinuma, M., Takemura, Y., Kinoshita, T., Motojima, G., Kenmochi, N., Kawamura, G., Suzuki, C., Nagy, A., Bortolon, A., Pablant, N. A., Mollen, A., Tamura, N., Gates, D. A., Morisaki, T.

“…In state-of-the-art stellarators, turbulence is a major cause of the degradation of plasma confinement. To maximize confinement, which eventually determines…”
Get full text

First experiments on RF plasma production at relatively low magnetic fields in the LHD by Kovtun, Yu.V., Kamio, S., Moiseenko, V.E., Kasahara, H., Seki, T., Saito, K., Seki, R., Masuzaki, S., Brezinsek, S., Dinklage, A.

“…Abstract The results of the first experimental series to produce a plasma using the radio frequency discharge (RF) above the ion cyclotron frequency at…”
Get full text

Deformation and fracture behavior of the W/ODS-Cu joint fabricated by the advanced brazing technique by Tokitani, M., Hamaji, Y., Hiraoka, Y., Masuzaki, S., Tamura, H., Noto, H., Tanaka, T., Muroga, T., Sagara, A.

“…In our previous work, the joint between oxide dispersion strengthened copper alloy (ODS-Cu), GlidCop® (Cu–0.3 wt%Al2O3) and tungsten (W) demonstrated superior…”
Get full text

Twisted-tape-induced swirl flow heat transfer and pressure drop in a short circular tube under velocities controlled by Hata, K., Masuzaki, S.

“…The twisted-tape-induced swirl flow heat transfer due to exponentially increasing heat inputs with various exponential periods ( Q = Q 0 exp( t/ τ), τ = 7, 14…”
Get full text

Leak tight joint procedures for ODS-Cu/ODS-Cu by the advanced brazing technique by Tokitani, M., Hamaji, Y., Hiraoka, Y., Masuzaki, S., Tamura, H., Noto, H., Tanaka, T., Muroga, T., Sagara, A.

“…The joint of the oxide dispersion strengthened copper alloy, ODS-Cu (ODS-Cu/ODS-Cu), was prepared. The applied ODS-Cu was GlidCop® (Cu-0.3 wt%Al2O3). The joint…”
Get full text

Full‐torus impurity transport simulation for optimizing plasma discharge operation using a multi‐species impurity powder dropper in the large helical device by Shoji, M., Kawamura, G., Smirnov, R., Tanaka, Y., Masuzaki, S., Uesugi, Y., Ashikawa, N., Gilson, E., Lunsford, R.

“…The transport of impurities supplied by a multi‐species impurity powder dropper (IPD) in the large helical device (LHD) is investigated using a…”
Get full text

In-vessel colorimetry of Wendelstein 7-X first wall components: variation of layer deposition distribution in OP1.2a and OP1.2b by Motojima, G, Masuzaki, S, Dhard, C P, Krause, M, Naujoks, D, Hayashi, Y, Brezinsek, S

“…A colorimetry study of the first wall panels in the Wendelstein 7-X (W7-X) was carried out using a compact color analyzer after Operation Phases OP1.2a and…”
Get full text

Plasma-wall interaction studies in W7-X: main results from the recent divertor operations by Dhard, C P, Brezinsek, S, Mayer, M, Naujoks, D, Masuzaki, S, Zhao, D, Yi, R, Oelmann, J, Schmid, K, Romazanov, J, Pardanaud, C, Kandler, M, Kharwandikar, A K, Schlisio, G, Volzke, O, Grote, H, Gao, Y, Rudischhauser, L, Goriaev, A, Wauters, T, Kirschner, A, Sereda, S, Wang, E, Rasinski, M, Dittmar, T, Motojima, G, Hwangbo, D, Kajita, S, Balden, M, Burwitz, V V, Neu, R, Linsmeier, Ch, W7-X Team, the

“…Abstract Wendelstein 7-X (W7-X) is an optimized stellarator with a 3-dimensional five-fold modular geometry. The plasma-wall-interaction (PWI) investigations…”
Get full text

Plasma wall interaction in long-pulse helium discharge in LHD – Microscopic modification of the wall surface and its impact on particle balance and impurity generation by Tokitani, M., Kasahara, H., Masuzaki, S., Motojima, G., Shoji, M., Ueda, Y., Yoshida, N., Yoshimura, Y., Nagasaki, K., Ashikawa, N., Mutoh, T., Yamada, H., Nagata, S.

“…Ultra-long-pulse helium discharge with ion and electron cyclotron heating (ICH+ECH) in the Large Helical Device (LHD) was achieved in a 48min plasma…”
Get full text

Tritium distributions in castellated structures of Be limiter tiles from JET-ITER-like wall experiments by Lee, S., Hatano, Y., Masuzaki, S., Oya, Y., Tokitani, M., Yajima, M., Otsuka, T., Ashikawa, N., Torikai, Y., Asakura, N., Nakamura, H., Kurotaki, H., Hayashi, T., Nozawa, T., Ito, A.M., Likonen, J., Widdowson, A., Rubel, M.

“…Abstract Tritium retention in the castellated structure of beryllium limiters used in JET with the ITER-like wall (ILW) during the first (ILW1), third (ILW3)…”
Get full text

Overview of tritium retention in divertor tiles and dust particles from the JET tokamak with the ITER-like wall by Torikai, Y., Kikuchi, G., Owada, A., Masuzaki, S., Otsuka, T., Ashikawa, N., Yajima, M., Tokitani, M., Oya, Y., Lee, S.E., Hatano, Y., Asakura, N., Hayashi, T., Oyaidzu, M., Likonen, J., Widdowson, A., Rubel, M.

“…Abstract Divertor tiles after Joint European Torus-ITER like wall (JET-ILW) campaigns and dust collected after JET-C and JET-ILW operation were examined by a…”
Get full text

Self‐consistent transport simulation of boron dust particle injection in the peripheral plasma in Large Helical Device by Shoji, M., Kawamura, G., Smirnov, R., Tanaka, Y., Masuzaki, S., Nespoli, F., Gilson, E., Lunsford, R.

“…The trajectories and the ablation positions of boron dust particles dropped from an impurity powder dropper in the peripheral plasma in the Large Helical…”
Get full text

A reduced-turbulence regime in the Large Helical Device upon injection of low-Z materials powders by Nespoli, F., Tanaka, K., Masuzaki, S., Ashikawa, N., Shoji, M., Gilson, E.P., Lunsford, R., Oishi, T., Ida, K., Yoshinuma, M., Takemura, Y., Kinoshita, T., Motojima, G., Osakabe, M., Kenmochi, N., Kawamura, G., Suzuki, C., Nagy, A., Bortolon, A., Pablant, N.A., Mollen, A., Tamura, N., Gates, D.A., Morisaki, T.

“…Abstract Recently an improved confinement regime, characterized by reduced turbulent fluctuations has been observed in the Large Helical Device upon the…”
Get full text

Inspection of W 7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments by Dhard, C P, Äkäslompolo, S, Balden, M, Baldzuhn, J, Biedermann, C, Bräuer, T, Brezinsek, S, Endler, M, Hayashi, Y, Hwangbo, D, Kajita, S, Krause, M, Kornejew, P, Masuzaki, S, Mayer, M, Motojima, G, Naujoks, D, Otte, M, Rohde, V

“…Due to its twisted magnetic field configurations, the orientation of the plasma-facing components (PFCs) of the Wendelstein 7-X stellarator is changed from…”
Get full text