A new pulse shape description for α particle pulses in a highly-sensitive sub-Kelvin bolometer
A new pulse shape description for α particle pulses in a highly-sensitive sub-Kelvin bolometer
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高灵敏度亚开尔文测辐射热计中 α 粒子脉冲的新脉冲形状描述
DOI：
10.1117/12.2313968
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
B. Maffei
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文献类型：
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作者：
S. Stever;F. Couchot;N. Coron;R. Janssen;B. Maffei
下一代宇宙学空间飞行任务将对宇宙射线产生的寄生信号敏感。为了了解电离辐射产生的能量的运动，我们用复合辐射热计研究了α粒子产生的脉冲。使用一系列的测量在100 mK，我们比较了典型的拟合算法（数学模型）与第二种方法的脉冲解释卷积探测器的热响应函数的起始配置文件的热化非热声子，考虑到热传播的影响。使用这种新的拟合方法，我们已经消除了使用更常见的方法产生的非物理二次非线性因子的需要，并且我们发现与热物理学的已知方面非常一致的脉冲形式。这项工作是在努力产生一个物理模型的能量沉积在这个探测器进行。建模的动机是再现实验数据集中的统计特征，对α脉冲形状的新解释代表了对该探测器中能量传播机制的当前理解的改进。
The next generation of cosmology space missions will be sensitive to parasitic signals arising from cosmic rays. Using a composite bolometer, we have investigated pulses produced by α particles in order to understand the movement of energy produced by ionising radiation. Using a series of measurements at 100 mK, we have compared the typical fitting algorithm (a mathematical model) with a second method of pulse interpretation by convolving the detector’s thermal response function with a starting profile of thermalised athermal phonons, taking into account the effects of heat propagation. Using this new fitting method, we have eliminated the need for a non-physical quadratic nonlinearity factor produced using more common methods, and we find a pulse form in good agreement with known aspects of thermal physics. This work is carried forward in the effort to produce a physical model for energy deposition in this detector. The modelling is motivated by the reproduction of statistical features in the experimental dataset, and the new interpretation of α pulse shapes represents an improvement in the current understanding of the energy propagation mechanisms in this detector.
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