A Computational Study to Find an Optimal RRR Value for a 1.5-T Persistent-Mode Conduction-Cooled MgB2 MRI Magnet From a Quench Protection Point of View

作者：Deissler Robert J^*; Baig Tanvir; Poole Charles; Amin Abdullah; Doll David; Tomsic Michael; Martens Michael

来源：IEEE Transactions on Applied Superconductivity, 2017, 27(4): 4702206.

DOI：10.1109/TASC.2017.2650982

• Superconducting magnet
• magnesium diboride
• numerical simulation
• quench protection
• magnetoresistance
• magnetothermal conductivity
• RRR value

The effect of magnetoresistance, magnetothermal conductivity (MTC), and RRR value on the active quench protection of a persistent-mode conduction-cooled 1.5 TMgB2 superconducting magnet is studied using numerical simulation. It is found that inclusion of magnetoresistance in the simulation can significantly decrease the calculated maximum temperature reached in this magnet during a quench, e.g., by 9K for RRR = 100. The inclusion of both magnetoresistance and MTC similarly decreases the peak temperature, but by a smaller amount, e.g., by 7 K for RRR = 100. Using copper with a lower RRR value can also significantly decrease the peak temperature reached in this magnet, e.g., by 16 K for RRR = 50 as compared to RRR = 200. However, decreasing the RRR value to much less than 50 results in a significantly higher voltage, e.g., decreasing the RRR value from 50 to 10 results in a 1000 V increase. A RRR value between 50 and 100 may provide a good balance.

• 出版日期2017-6