| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
We report the results obtained in the present study as follows, for the purpose of developing a cryogenic pump to generate a superfluid helium flow.
(1) We have successfully developed a cryogenic motor, rotating even at low temperatures below 4.2 K. To operate a motor at very low temperature, we adopted a brushless motor with a cryogenic Hall device, ferrite core with no magnetic hysteresis at low temperatures, and a sliding bearing with no grease. The motor has achieved a rotation range from 2 to 40 revolutions/second with a power below 0.25 W at a temperature of 2 K. (2) We have observed a rotating flow of superfluid helium generated by the motor. The flow rotation is almost equal to the rotation speed of the motor. (3) We developed a centrifugal pump using a helium rotation state, generating a superfluid helium flow.
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