Detection of temperature Rise at 4.2 k by Using a Dual-Core Optical Fiber - An Optical Method to Detect a Quench of a Superconducting Magnet.
We performed a experiment to detect a temperature rise at cryogenic temperature using a dual-core optical fiber. This fiber has two single-mode optical cores in one fiber. We demonstrated that a temperature rise of 4 K was detectable at 4.2 K. The sensitivity of this method can be improved using a longer fiber. This method may be applicable as a quench detector for superconducting magnets. A quench detector using this optical method is immune from electromagnetic noise, free from troubles caused by break-down of electrical insulator, and has many advantages over a conventional quench detector measuring voltages of a magnet.
KeywordsTemperature Rise Interference Fringe Cryogenic Temperature Electromagnetic Noise Fringe Shift
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