Calibration Study of Low-Noise Detection Chain for Axion Haloscope Search

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题名:	Calibration Study of Low-Noise Detection Chain for Axion Haloscope Search
作者:	劉瀚文;Liu, Han-Wen
贡献者:	物理學系
关键词:	Y因子方法;軸子探測;共振腔輻射熱校正;開關校正;放大鍊校正;約瑟夫森參數放大器;Y-factor method;Axion haloscope detection;Cavity-emitted radiation calibration;On-off calibration;Amplification chain calibration;Josephson parametric amplifier
日期:	2024-07-04
上传时间:	2024-10-09 15:46:34 (UTC+8)
出版者:	國立中央大學
摘要:	軸子作為一種假想粒子，預計在與電磁場交互作用下會轉換為光子。在軸子探測的實驗中，轉換的光子會在共振腔累積。縱使已累積光子作為訊號，訊號強度仍然很弱，因此準確地校正探測鍊的噪聲至關重要。以往的實驗中，利用Y因子方法校正時，必須假設兩條導線的行為彼此類似，再將一條校正鍊的結果類比至探測鍊。現在，利用共振腔輻射熱校正探測鍊可以免去”相似假設”，而且他的可行性也被證實。此外，使用開關校正方法可以決定參量放大器的增益。整合兩種校正方法，共振腔輻射熱校正與開關校正，便能精確的決定軸子探測的系統雜訊。 ;A hypothetical particle, the axion, is predicted to transform into photons when it interacts with an electromagnetic field. In the haloscope detection, the transformed photons accumulate in a cavity. However, the signal produced by the accumulated axions is still weak, so accurately determining the system noise through calibration is crucial. Tradi tionally, the Y-factor calibration method was necessary to assume that cable losses were similar. However, a new method of cavity-emitted radiation calibration has eliminated the need for this assumption and its feasibility is proven. Additionally, the on-off method has been introduced to characterize the gain of the Josephson parametric amplifier. By integrating the results of radiation calibration and on-off calibration, the system noise can be determined accurately.
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