Mitsubishi Denki Kabushiki Kaisha

Akinori Ohara

Tadatoshi Yamada

Takeo Kawaguchi

Takashi Inaguchi

Masatami Iwamoto

Yuuichi Yamamoto

Toshiyuki Amano

Itsuo Kodera

Yoshiyuki Tsuda

Shunji Yamamoto

Takashi Murai

Shirou Nakamura

Katsuyoshi Toyoda

The invention provides a persistent current circuit switch of high performance having a small contact resistance. The persistent current circuit switch has a pair of oppositely arranged electrodes and ends of the electrodes are brought into line contact or dot contact with each other. A bore is located at the center of the end of one of the electrodes to reduce the rigidity of the electrode end so that the electrodes can be brought smoothly into contact with each other.

Persistent current circuit switch

Superconducting magnet and regenerative refrigerator can be reduced in size of the apparatus and is capable of reducing the evaporating amount of liquid helium. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are disposed so as to enclose a coil portion helium tank 2a which contains superconducting coil 1. Further, a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are disposed so as to enclose a helium reservoir tank 2b which stores liquid helium 3. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are cooled by a coil portion 2-stage type Gifford-McMahon cycle refrigerator 50a while a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are cooled by a helium reservoir portion 2-stage type Gifford-McMahon cycle refrigerator 50b.

Superconducting magnet and regenerative refrigerator for the magnet

Superconducting magnet and regenerative refrigerator can be reduced in size of the apparatus and is capable reducing the evaporating amount of liquid helium. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are disposed so as to enclose a coil portion helium tank 2a which contains superconducting coil 1. Further, a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are disposed so as to enclose a helium reservoir tank 2b which stores liquid helium 3. A coil portion second thermal shield 17a and a coil portion thermal shield 8a are cooled by a coil portion 2-stage type Gifford-McMahon cycle refrigerator 50a while a helium portion second thermal shield 17b and a helium reservoir portion thermal shield 8b are cooled by a helium reservoir portion 2-stage type Gifford-McMahon cycle refrigerator 50b.

Method for separating superconductor powder from nonsuperconductive

A vacuum chamber for a superconducting SOR apparatus comprises a main chamber through which a beam of charged particles can pass and an SOR chamber which opens onto the inside of the main chamber. The main chamber has a connecting flange formed on each end, and the SOR chamber has a connecting flange formed on its outer end. The dimensions of the vacuum chamber are such that the entire vacuum chamber can fit into the gap between the vacuum tanks of a superconducting bending magnet for the SOR apparatus. The vacuum chamber may further comprise an SOR port in the form of a tube having a flange which connects to the flange of the SOR chamber. The cross-sectional dimensions of the SOR port increase from the inner end which is connected to the SOR chamber to the outer end.

Vacuum chamber for an SOR apparatus

A superconducting synchrotron orbital radiation (SOR) apparatus having a plurality of deflecting electromagnets each comprising first and second superconducting coils which are immersed in liquid helium contained in helium tanks. The helium tanks are surrounded by nitrogen shields which are cooled by liquid nitrogen in nitrogen contained tanks. One of the helium tanks is equipped with a liquid helium supply port and a helium gas exhaust port. All of the other helium tanks are connected with this helium tank such that liquid helium which is supplied to this one helium tank automatically flows to the other helium tanks and such that helium gas from the other helium tanks automatically flows to this helium tank and is exhausted. One of the nitrogen tanks is equipped with a liquid nitrogen supply port and a nitrogen gas exhaust port, and all of the other nitrogen tanks are connected with this nitrogen tank so that liquid nitrogen which is supplied to this nitrogen tank automatically flows to the other nitrogen tanks, and nitrogen gas from the other nitrogen tanks automatically flows to this nitrogen tank and is exhausted.

Superconducting synchrotron orbital radiation apparatus

A vertically compact cryostat includes a housing 2 having a cylindrical lower chamber 3a containing a superconducting coil 1 and a contiguous, larger diameter, overhanging upper chamber 3b serving as a liquid helium reservoir. An annular liquid nitrogen tank 15 surrounds the lower chamber and underlies the upper chamber overhang to thermally insulate the helium and minimize the evaporation thereof. The assembly is completed by a metallic thermal shield 17 attached to the tank and enclosing the housing, and a vacuum vessel surrounding the tank and shield.

Growing community of inventors

Amagasaki, Japan

Akinori Ohara