Metallic Magnetic Calorimeters for Particle Detection
Metallic Magnetic Calorimeters for Particle Detection
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用于粒子检测的金属磁热量计
DOI：
10.1023/a:1004863823166
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发表时间：
2000
影响因子：
2
通讯作者：
G. Seidel
中科院分区：
文献类型：
--
作者：
C. Enss;A. Fleischmann;K. Horst;J. Schönefeld;J. Sollner;J. S. Adams;Y. H. Huang;Y. H. Kim;G. Seidel
磁量热计的工作原理和理论，在金属主机的顺磁离子的稀浓度制成，讨论了有关使用这样的设备作为探测器的X射线。量热计对能量吸收的响应取决于尺寸、热容、温度、磁场、自旋浓度以及它们之间的相互作用。导出了优化量热计性能的条件。噪声源，特别是由于在金属中的电子的热力学波动，进行了分析。在以Er为顺磁离子、Au为基质金属的探测器上进行了测量。一个热容量为10−12 J/K的探测器在6 keV时的测量分辨率为12 eV。在一个适合使用硬X射线高达200千电子伏的分辨率为120 eV的检测器。计算表明，这两种检测器的性能可以提高一个数量级。在低于50 mK的温度下，的Au：Er量热计的能量沉积的时间响应表明存在一个额外的热容量，我们解释为所产生的四分裂的Au核的电场梯度中引入的Er离子的存在。
The principles and theory of operation of a magnetic calorimeter, made of a dilute concentration of paramagnetic ions in a metallic host, is discussed in relation to the use of such a device as a detector of x-rays. The response of a calorimeter to the absorption of energy depends upon size, heat capacity, temperature, magnetic field, concentration of spins and interactions among them. The conditions that optimize the performance of a calorimeter are derived. Noise sources, especially that due to thermodynamic fluctuations of the electrons in the metal, are analyzed. Measurements have been made on detectors in which Er serves as the paramagnetic ion and Au as the host metal. The measured resolution of a detector with a heat capacity of 10−12 J/K was 12 eV at 6 keV. In a detector suitable for use with hard x-rays up to 200 keV a resolution of 120 eV was obtained. Calculations indicate that the performance of both detectors can be improved by an order of magnitude. At temperatures below 50 mK, the time response of the Au : Er calorimeters to an energy deposition indicates the presence of an additional heat capacity, which we interpret as arising from the quadruple splitting of the Au nuclei in the electric field gradients introduced by the presence of the Er ions.