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Okamura Lab.

The research field of my laboratory is refrigeration and cooling engineering. For instance, superconducting magnet cooling technology, performance improvement of cryocooler and recently we have been developing a room-temperature magnetic refrigerator that is an environment-friendly new type refrigerator.
Experiments are main means for our research. From one up to three students are engaged on the respective subject. Numerical simulations are also important to discuss on the experimental results.

MAIN RESEARCH

Development of room-temperature magnetic refrigerator


This refrigerator does not use chloro- fluorocarbon (CFC) or substitute CFC, while uses magnet-caloric effect. Some materials have this effect that heat generation and absorption are occurred when the materials are magnetized and de-magnetized. It is important to use magnet-caloric effect for cooling effectively.

Development of high Tc superconducting (HTS) magnet excited by thermo-electric element


A thermo-electric element, its electromotive force is a few millivolts, can supply a few hundred ampere current to a HTS magnet, because the electric resistance of HTS magnet is less than a few micro-ohm.
We have demonstrated an excitation of 1 tesla class HTS magnet using a thermo-electric element. The size of the element is only 3 cm x 3 cm square and 1.8 mm thick. This is so small and light compared with a conventional power supply for HTS magnet. We are exploring the applications of this system (e.g. for a plasma magnetic sail space craft, as a mobile magnet)

Development of thermo-syphon working at cryogenic temperature

Refrigerants for superconducting magnets or devices, such as liquid helium and nitrogen, vaporize due to heat leakage from the ambient temperature surroundings. This thermo-syphon condenses the vaporized gas into liquid and returns it to a refrigerant-storage vessel.
If we equip this device to a cryogenic system, refilling of refrigerant becomes no need. The vaporized gas is condensed in the upper part of the thermo-syphon using a cryocooler and the condensed refrigerant flows down to the storage vessel because of gravity. Development of thermo-syphon as small as we can and having larger condensation ability is going on.
2014.06.07 Joint seminar@ Lake Ymanaka


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Suzukakedai Campus G3-412 / tokamura[@]es.titech.ac.jp

〒226-8502
4259 G3-39, Nagatsuta-cho, Mifdori-ku, Yokohama