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本文以一个16cm内径,4.9T超导磁体作为实例,给出了超导磁体分段内保护的设计方法和实验结果。根据超导体的正常态传播速度,利用迭代法可计算出线圈的热量产生、温升、电阻的增加和电流衰减特性等。在给定线圈的最大允许温升情况下,我们能够确定出应将绕组分为多少段和每段所并联的分流电阻的数值。对于正常态区域传播速度很快的密绕的或者浸渍的高电流密度磁体,电感很大的超导磁体、自然分段的Nb_3Sn并绕磁体和在持续电流模型下运行的磁体,常常采用分段内保护方法。分段内保护常常是简单的、可靠的和费用低的。其缺点是消耗比较多的液氦。
In this paper, a 16cm inner diameter, 4.9T superconducting magnet is taken as an example to give the design method and experimental results of the superconducting magnet inside the segment. According to the normal state of superconductor propagation velocity, the use of iterative method can be calculated coil heat generation, temperature rise, resistance increase and current attenuation characteristics. Given the maximum allowable temperature rise of the coil, we can determine the number of divisions into which the winding should be divided and the value of the shunt resistor in parallel for each segment. For densely-packed or impregnated high-current density magnets with very fast propagation velocity in the normal state, highly inductive superconducting magnets, naturally segmented Nb_3Sn and surrounding magnets and magnets operating in continuous current mode, Internal protection method. Segment protection is often simple, reliable, and low cost. The disadvantage is that more liquid helium is consumed.