当前位置: X-MOL 学术Physica C › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of heaters on the measurement of normal zone propagation velocity on short YBCO conductors
Physica C: Superconductivity and its Applications ( IF 1.3 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.physc.2021.1353848
Jùn Zhou , Justin Schwartz

Based on a fully two-dimensional (2D) electrothermal model, the quench propagation characteristics of short superconducting YBa2Cu3O7-x conductors (AMSC and SuperPower), including the minimum quench energy (MQE), normal zone propagation velocity (NZPV) and hot spot temperature rising rate, are studied by numerical simulations in this paper. It is found that different heater configurations, such as the size of heater and the duration of heat pulse, can result variations of the MQEs and NZPVs. During the quench propagation processes, the NZPV and the normal zone length (LNZ), when viewed as functions of the hot spot temperature Tpeak, i.e., NZPV(Tpeak) and LNZ(Tpeak), are not sensitive to the heater configurations for relatively higher operating temperature from 50 K – 70 K. For both AMSC and SuperPower's YBCO conductor, the simulation results show that the hot spot temperature rising rate dTpeak/dt, as a nearly-linear function of Tpeak, is almost not affected by heater configurations for a given fixed operating temperature in the regime 30 – 70 K. For a fixed operating temperature in the regime 30 – 50 K, the temperature rising rate of SuperPower's conductor can reach 1000 K/s ~ 6000 K/s as Tpeak rising from ~110 K to 300 K, which makes it challenging to experimentally determine the NZPV prior the moment Tpeak reaches the temperature limit 300 K. The relations LNZ(Tpeak) obtained for SuperPower's conductor can provide information for the selection of reference voltage employed to determine the NZPV.



中文翻译:

加热器对短YBCO导体正常区域传播速度测量的影响

基于完全二维(2D)电热模型,短超导YBa 2 Cu 3 O 7-x导体(AMSC和SuperPower)的猝灭传播特性,包括最小猝灭能量(MQE),法向区域传播速度(NZPV) )和热点温度上升率,通过数值模拟进行了研究。发现不同的加热器配置,例如加热器的大小和热脉冲的持续时间,可能会导致MQE和NZPV的变化。在淬火传播过程中,当将NZPV和正常区域长度(L NZ)作为热点温度T峰值(即NZPV(T峰值)的函数时,)和L NZT峰值),对于50 K – 70 K相对较高的工作温度对加热器配置不敏感。对于AMSC和SuperPower的YBCO导体,仿真结果均显示热点温度上升速率d T峰值/ dt,作为T peak的近似线性函数,在给定的固定工作温度为30 – 70 K的情况下,几乎不受加热器配置的影响。对于在30 – 50 K的固定工作温度下,温度的升高T峰时SuperPower导体的速率可以达到1000 K / s〜6000 K / s从〜110 K上升到300 K,这使得在T峰值达到温度极限300 K之前在实验上确定NZPV具有挑战性。SuperPower导体获得的关系L NZT peak)可为选择参考提供信息用于确定NZPV的电压。

更新日期:2021-03-04
down
wechat
bug