论文标题
Cuore低温量热计的能量依赖性电热反应模型
An Energy-dependent Electro-thermal Response Model of CUORE Cryogenic Calorimeter
论文作者
论文摘要
稀有事件的低温地下观测站（Cuore）是最敏感的实验，在$^{130} \ text {te} $中寻找中微子双β衰变（$0νββ$）。 Cuore使用的低温阵列为988 TEO $ _2 $ calorimeters以$ \ sim $ 10 mk的价格运行，总质量为741千克。为了进一步提高灵敏度，必须充分理解检测器响应。在这里，我们呈现了Cuore实验的非线性热模型。我们已经通过将非线性微分方程拟合到Cuore通道子集的检测器数据，这些探测器的平衡和动态电热模型通过数值拟合的非线性微分方程，这些方程式具有很好的特征并代表了所有通道。我们证明，仅NTD-GE热敏电阻中电阻的热电子效应和电场依赖性不足以描述我们的探测器依赖能量脉冲形状。我们在热敏电阻的指数温度依赖性中引入了经验二阶校正因子，该温度依赖性与能量依赖性脉冲形状数据产生了极好的一致性，高达6 MeV。我们还使用拟合的热参数提出了噪声分析，并表明与检测器观察到的噪声相比，固有的热噪声可以忽略不计。
The Cryogenic Underground Observatory for Rare Events (CUORE) is the most sensitive experiment searching for neutrinoless double-beta decay ($0νββ$) in $^{130}\text{Te}$. CUORE uses a cryogenic array of 988 TeO$_2$ calorimeters operated at $\sim$10 mK with a total mass of 741 kg. To further increase the sensitivity, the detector response must be well understood. Here, we present a non-linear thermal model for the CUORE experiment on a detector-by-detector basis. We have examined both equilibrium and dynamic electro-thermal models of detectors by numerically fitting non-linear differential equations to the detector data of a subset of CUORE channels which are well characterized and representative of all channels. We demonstrate that the hot-electron effect and electric-field dependence of resistance in NTD-Ge thermistors alone are inadequate to describe our detectors' energy dependent pulse shapes. We introduce an empirical second-order correction factor in the exponential temperature dependence of the thermistor, which produces excellent agreement with energy-dependent pulse shape data up to 6 MeV. We also present a noise analysis using the fitted thermal parameters and show that the intrinsic thermal noise is negligible compared to the observed noise for our detectors.
