| Autor: |
Kohki Takahashi, Tomoya Hase, Satoshi Awaji, Akinobu Nakai, Satoshi Yamano, Shinichi Mukoyama, Hisaki Sakamoto |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Applied Superconductivity; Apr2018, Vol. 28 Issue 3, p1-4, 4p |
| Abstrakt: |
A superconducting joint and a persistent current switch are the key technologies in persistent current operation for MRI and NMR magnets to obtain higher resolution and sensitivity. We prepared a persistent current system including a superconducting joint, a persistent current switch, and a double pancake coil, which were fabricated with a REBCO tape. The magnetic field decay behavior in persistent current operation were observed in a self-field and the external magnetic field of 1 T at 20 K. In the self-field, the decay rate of persistent current excited up to 170 A reached to 1.7 ppm/h after five days operation. This means that the practical persistent current operation has been achieved successfully using the REBCO superconducting joint. From the voltage-current characteristics estimated from the magnetic field decay, it was found that the decay behavior of persistent current is dominated by the joint resistance in 1 T, but by the shielding current in the self-field. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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