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Ogiwara, Norio
Journal of the Vacuum Society of Japan, 58(5), p.168 - 172, 2015/05
The angular distribution of molecules emitted from rotating disks with a small gap was simulated using the Monte Carlo method. As the molecules have a circumferential velocity 
(: distance from the rotating axis and : angular velocity), when they leave the surfaces of the rotating disks, they tend to be emitted toward the tangent lines of the rims of the disks. When the disks rotate with a velocity ratio 
/ 
(: radius of the disk and : mean velocity of the molecules) of 3.8, three quarters of the outgoing molecules gather within an angle of 0.4 radians from the tangent line. The angular distribution is related to the altitude almost independent of the revolution frequency with a value of less than 2, where the rotating vector is specified to be oriented to zenith.
Kamiya, Junichiro; Ogiwara, Norio; Hikichi, Yusuke; Yanagibashi, Toru; Kinsho, Michikazu
Journal of the Vacuum Society of Japan, 58(4), p.134 - 139, 2015/04
This report aims to propose a new in situ degassing method by which only the kicker magnets were baked out without raising the temperature of the vacuum chamber by installing heat source and heat shield between the kicker magnet and the chamber wall. The target temperature of the ferrites in the kicker magnet is above 100
C, while keeping the temperature rise of the vacuum chamber less than 30C in order to prevent the heat expansion of the vacuum chamber. After checking the operability of this method by thermal analysis with simple model, the experimental measurement was performed by using a RCS kicker magnet. The results showed that the target temperature was able to be achieved by this degassing method.
Yoshii, Kenji; Mizumaki, Masaichiro*; Hayashi, Naoaki*; Matsumura, Daiju; Takano, Mikio*
no journal, ,
The barium iron oxide BaFeO containing high-valence Fe
has been known to have a hexagonal crystal structure. This materials is synthesized under high pressure and shows antiferromagnetic ordering at 160 However, a recent investigation revealed that BaFeO has a cubic structure and shows a ferromagnetic transition at 110 K, if it is prepared in a flow of ozone at a low temperature of 200. In this presentation, we will show magnetic and spectroscopic studies using synchrotron radiation to reveal details of physical properties of this system. Magnetic measurements showed large magnetocaloric effect at around 110 K without hysteretic loss. From magnetic circular dichroism measurements, the small hysteresis is owing to the fact that Fe is actually in the Fe
state, which has no orbital magnetic moment. This result suggests that a search for new materials containing Fe is interesting from the viewpoint of development of new magnetic refrigerants.
Teraoka, Yuden
no journal, ,
no abstracts in English
