Fluid-dynamics and transport of 210Po in the scintillator Borexino detector: A numerical analysis
Fluid-dynamics and transport of 210Po in the scintillator Borexino detector: A numerical analysis
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闪烁体 Borexino 探测器中 210Po 的流体动力学和输运：数值分析
DOI：
10.1016/j.nima.2020.163801
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Pietrofaccia, L.
中科院分区：
文献类型：
--
作者：
Di Marcello, V.;Bravo-Berguño, D.;Mereu, R.;Calaprice, F.;Di Giacinto, A.;Di Ludovico, A.;Ianni, Aldo;Ianni, Andrea;Rossi, N.;Pietrofaccia, L.
除了过去几年Borexino实验对中微子物理的重要贡献外，INFN Gran Sasso国家实验室正在进行研究活动，以进一步提高探测器的灵敏度，以便准确测量次要的CNO太阳中微子速率。为此，提高探测器的流体动力稳定性是进一步降低210Po本底的关键，该本底是由对流电流在测量基准体积内连续输送的。在这个框架下，对探测器流体动力学的数值模拟有助于更好地理解210Po的行为，并提出有效的对策，能够最小化探测器内部的自然对流。在本工作中，对Borexino热力学和流体动力学进行了二维数值模拟，以提高目前对Borexino热力学和流体动力学的理解。所采用的模型针对不同的区域和感兴趣的时期进行了优化，重点放在被确定为影响钚本底浓度的最关键方面。特别是，为了验证模型的温度预测，构建了一个特定于Borexino的基准。导出的容器内表面温度被连续用作探测器最内部更精确的对流模型的边界条件。在计算对流电流的基础上，用对流扩散模型研究了本底210Po在探测器有效体积内的输运行为，计算结果与实验数据吻合较好。
Moving beyond the important contributions to neutrino physics obtained by the Borexino experiment during the last years, research activities are ongoing at INFN Gran Sasso National Laboratories to further improve the detector sensitivity in order to perform an accurate measurement of the subdominant CNO solar neutrino rate. To this purpose, the improvement of the detector fluid-dynamic stability is the key to further reduce the210Po background, that is continuously being transported inside the measurement fiducial volume by convective currents. In this framework, numerical simulations of the detector fluid-dynamics may help to better comprehend the210Po behaviour, and also to suggest effective countermeasures, able to minimize the natural convection inside the detector.In the present work, two-dimensional numerical simulations have been performed to improve the current understanding of Borexino thermal and fluid-dynamics. Adopted models have been optimized for different regions and periods of interest, focusing on the most critical aspects that were identified as influencing the polonium background concentrations. In particular, a Borexino-specific benchmark was constructed in order to validate the model temperature predictions. The derived inner vessel surface temperatures are successively used as boundary conditions for a more refined convective model of the inner most part of the detector. Based on the calculated convective currents, the transport behaviour of background210Po inside the detector active volume was investigated by means of a convection–diffusion model, showing a reasonable good agreement between calculations and experimental data.
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