Twisting an optomechanical cavity

Oue, Daigo*; Matsuo, Mamoru

Physical Review A, 106(4), p.L041501_1 - L041501_7, 2022/10

https://doi.org/10.1103/PhysRevA.106.L041501

Enhancement of domain-wall mobility detected by NMR at the angular momentum compensation temperature

Imai, Masaki; Chudo, Hiroyuki; Matsuo, Mamoru; Maekawa, Sadamichi; Saito, Eiji

Physical Review B, 102(1), p.014407_1 - 014407_5, 2020/07

https://doi.org/10.1103/PhysRevB.102.014407

Observation of gyromagnetic reversal

Imai, Masaki; Ogata, Yudai*; Chudo, Hiroyuki; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru*; Onuma, Yuichi*; Maekawa, Sadamichi; Saito, Eiji

Applied Physics Letters, 113(5), p.052402_1 - 052402_3, 2018/07

https://doi.org/10.1063/1.5041464

Plasma generation using high power microwave and application of space propulsion

Oda, Yasuhisa*; Komurasaki, Kimiya*; Takahashi, Koji; Kasugai, Atsushi; Sakamoto, Keishi

Denki Gakkai Kenkyukai Shiryo, Genshiryoku Kenkyukai (NE-04-1115), p.19 - 22, 2004/09

no abstracts in English

Fundamental experiments of Microwave thruster

Matsui, Makoto*; Mihara, Yorichika*; Nakagawa, Tatsuo*; Mori, Koichi*; Komurasaki, Kimiya*; Takahashi, Koji; Sakamoto, Keishi; Imai, Tsuyoshi

Uchu Yuso Shimpojiumu (Heisei-14-Nendo) Koenshu, p.300 - 303, 2003/00

no abstracts in English

Active control of internal transport barrier and confinement database in JT-60U reversed shear plasma

Sakamoto, Yoshiteru; Takizuka, Tomonori; Shirai, Hiroshi; Fujita, Takaaki; Kamada, Yutaka; Ide, Shunsuke; Fukuda, Takeshi; Koide, Yoshihiko

Journal of Plasma and Fusion Research SERIES, Vol.4, p.249 - 252, 2001/00

no abstracts in English

SIMMER-III Analysis, of Gas-Liquid Flow with Large Liquid Density

Suzuki, Toru; Tobita, Yoshiharu

JNC TN9400 2000-019, 35 Pages, 2000/03

JNC-TN9400-2000-019.pdf:1.79MB

The transition phase analysis code SIMMER-III has been developed to appropriately evaluate the core disruptive accident in a fast breeder reactor. The momentum exchange model used in the fluid dynamics portion of the code uses the conventional correlation based on ordinary flows such as air-water flows. lt has already been confirmed that this code can represent the experimental results of ordinary flows. However, more detailed research is needed to confirm that this code is applicable to two-phase flow with large liquid density, which would be formed in an actual molten core pool. In addition, since the shapes of bubbles affect their drag in the bubbly flow where the liquid and the gas form continuous and dispersed phases, respectively, it is necessary to take this effect of bubble shape into account to improve SIMMER-III's analytical precision. ln this study, using experimental results obtained through a joint research program with Kyoto university, the momentum exchange model of SIMMER-III is assessed with regard to the bubbly flow regime of two-phase flow with large liquid density, on which experimental data and information on bubble shapes had been lacking. This study suggests that the original SIMMER-III can appropriately represent the characteristics of bubbly flows containing ellipsoidal bubbles with relatively small gas flux. Moreover, this study shows that the precision of SIMMER-III for bubbly flows containing cap bubbles with relatively large gas flux is much improved by using Kataoka-lshii's correlation to determine the drag coefficient of bubbles in the momentum exchange model.

Numerical Investigation on Thermal Stratification and Striping Phenomena in Various Coolants

Yang Zumao*;

JNC TN9400 2000-009, 81 Pages, 2000/02

JNC-TN9400-2000-009.pdf:47.3MB

It is important to study thermal stratification and striping phenomena for they can induce thermal fatigue failure of structures. This presentation uses the AQUA code, which has been developed in Japan Nuclear Cycle Development Institute (JNC), to investigate the characteristics of these thermal phenomena in water, liquid sodium, liquid lead and carbon dioxide gas. There are altogether eight calculated cases with same Richardson number and initial inlet hot velocity in thermal stratification calculations, in which four cases have same velocity difference between inlet hot and cold fluid, the other four cases with same temperature difference. The calculated results show : (1) The fluid's properties and initial conditions have considerable effects on thermal stratification, which is decided by the combination of such as thermal conduction, viscous dissipation and buoyant force, etc., and (2) The gas has distinctive thermal stratification characteristics from those of liquid because for

Evaluation for the Effects of a Ring Plate Device to Eliminate FreeSurface Gradients in Liquid Metall Fast Breeder Reactor Vessel UsingMulti-Dimensional Thermohydraulics

Gao Ming Quing*

PNC TN9410 97-016, 42 Pages, 1997/02

PNC-TN9410-97-016.pdf:1.3MB

There is a free surface at the upper plenum in a reactor vessel of LMFBR.The free surface has spatial gradient caused by the internal coolant flow.This is a disadvantageous factor to engineering from the view point of gas entrainment into coolant. To eliminate the free surface gradients,ring plates about 20cm wide are fitted at about 1 meter under the free surface. They interfere fluid flow,and decrease the component velocity in vertical direction.To investigate the efficiency ofthe ringplates, analyses with the AQUA-VOF code were carried out.For contrast, three conditions were given:Case-1:Without ring plates.Case-2:Ring plates,fitted at 1.125m under the free surface.Case-3:Ring plates,fitted at 1.5m under the free surface. The results shown that the ring plateshave a sufficiently high potential to elminate the free surface gradients due to disperse the momentum along reactor vessel axis to radial direction.In the calculations with ring plate (Case-2 and -3),the maximum free surface heig

Evidence for a toroidal-momentum-transport nondiffusive term from the JFT-2M tokamak

*; Miura, Yukitoshi; Matsuda, Toshiaki; Ito, Kimitaka; *; Ito, Sanae*; JFT-2M Group

Physical Review Letters, 74(11), p.1990 - 1993, 1995/03

https://doi.org/10.1103/PhysRevLett.74.1990

no abstracts in English