کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
273749 505060 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of magnetic hysteresis on quench-voltage detection in large superconducting magnets
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Influence of magnetic hysteresis on quench-voltage detection in large superconducting magnets
چکیده انگلیسی

We present a technical problem caused by magnetic hysteresis in quench-voltage detection systems for superconducting magnets. To detect a quench sensitively, it is necessary to use a balanced bridge circuit for canceling out inductive terminal voltages across a magnet. However, a changing magnetization due to shielding currents influences the quench-voltage detection in large superconducting magnets. In particular, the specifically designed detection system for the large helical device (LHD) cannot balance terminal voltages perfectly by adjusting a potentiometer to eliminate the inductive component. We apply a simple theoretical model and a numerical analysis to evaluate the out-of-balance voltage due to superconducting magnetization and coupling currents. The analysis indicates that the observed out-of-balance voltage in the LHD can be explained by a difference in magnetic hysteresis between two symmetric coils, caused by differences in the penetration field and coupling time constant between the conductors. Because a terminal voltage due to magnetic hysteresis is proportional to the volume of a superconductor, the influence of magnetization must be taken into account for large superconducting magnets.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fusion Engineering and Design - Volume 81, Issues 20–22, November 2006, Pages 2571–2575
نویسندگان
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