Microscopic simulation of xenon-based optical TPCs in the presence of molecular additives
C. D. R. Azevedo, D. Gonzalez-Diaz, S. F. Biagi, C. A. B. Oliveira, C. A. O. Henriques, J. Escada, F. Monrabal, J. J. Gómez-Cadenas, V. Álvarez, J. M. Benlloch-… 展开作者
C. D. R. Azevedo, D. Gonzalez-Diaz, S. F. Biagi, C. A. B. Oliveira, C. A. O. Henriques, J. Escada, F. Monrabal, J. J. Gómez-Cadenas, V. Álvarez, J. M. Benlloch-Rodríguez F. I. G. M. Borges, A. Botas, S. Cárcel, J. V. Carrión, S. Cebrián, C. A. N. Conde, J. Díaz, M. Diesburg, R. Esteve, R. Felkai, L. M. P. Fernandes, P. Ferrario, A. L. Ferreira, E. D. C. Freitas, A. Goldschmidt, R. M. Gutiérrez, J. Hauptman, A. I. Hernandez, J. A. Hernando Morata, V. Herrero, B. J. P. Jones, L. Labarga, A. Laing, P. Lebrun, I. Liubarsky, N. Lopez-March, M. Losada, J. Martín-Albo, A. Martínez, A. D. McDonald, C. M. B. Monteiro, F. J. Mora, L. M. Moutinho, J. Muñoz Vidal, M. Musti, M. Nebot-Guinot, P. Novella, D. Nygren, B. Palmeiro, A. Para, J. Pérez, M. Querol, J. Renner, L. Ripoll, J. Rodríguez, L. Rogers, F. P. Santos, J. M. F. dos Santos, L. Serra, D. Shuman, A. Simón, C. Sofka, M. Sorel, T. Stiegler, J. F. Toledo, J. Torrent, Z. Tsamalaidze, J. F. C. A. Veloso, R. Webb, J. T. White, N. Yahlali
We introduce a simulation framework for the transport of high and low energy electrons in xenon-based gaseous optical time projection chambers (OTPCs). The simulation relies on elementary cross sections (electron-atom and electron-molecule) and incorporates, in order to compute the gas scintillation, the reaction/quenching rates (atom-atom and atom-molecule) of the first 41 excited states of xenon and the relevant associated excimers, together with their radiative cascade. The results compare positively with observations made in pure xenon and its mixtures with CO$_2$ and CF$_4$ in a range of pressures from 0.1 to 10~bar. This work sheds some light on the elementary processes responsible for the primary and secondary xenon-scintillation mechanisms in the presence of additives, that are of interest to the OTPC technology.
Secondary scintillation yield of Xenon with sub-percent levels of CO2 additive: efficiently reducing electron diffusion in HPXe optical TPCs for rare-event detection
Predicting the single-site and multi-site event discrimination power of dual-phase time projection chambers
Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；Stanford University（斯坦福大学）；University of California San Diego（加州大学圣迭戈分校）；SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Washington University in St. Louis（华盛顿大学圣路易斯分校）
A journey to ITACA: Ion Tracking with Ammonium Cations Apparatus
Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；Ikerbasque (Basque Foundation for Science)（伊克尔巴斯基克（巴斯克科学基金会））；Universidad del País Vasco (UPV/EHU)（巴斯克大学）；Ben-Gurion University of the Negev（内盖夫本-古里安大学）；Instituto de Física Corpuscular (IFIC)（粒子物理研究所）
Low-Energy Radon Backgrounds from Electrode Grids in Dual-Phase Xenon TPCs
SLAC National Accelerator Laboratory（斯坦福直线加速器中心）；Kavli Institute for Particle Astrophysics and Cosmology, Stanford University（卡弗里粒子天体物理与宇宙学研究所，斯坦福大学）；University College London (UCL)（伦敦大学学院）；Brown University（布朗大学）；University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；University of California, Santa Barbara（加州大学圣塔芭芭拉分校）；Imperial College London（帝国理工学院）；University of Maryland（马里兰大学）
我们提出的证据，非准分子为基础的二次闪烁气态氙，获得使用NEXT白色TPC和一个专用的设置。与第一原理计算的详细比较使我们能够将这种闪烁机制分配给中性韧致辐射（NBrS），这是一个被假定存在于氙中的过程，在很大程度上被忽视了。对于低于1000 nm的光子发射，NBrS产率从50 V cm $^{-1}$ bar $^{-1}$的减压电场值下的约10 $^{-2}$光子/e $^{-}$ cm $^{-1}$ bar $^{-1}$增加到500 V cm $^{-1}$ bar $^{-1}$下的3 $\times$ 10 $^{-1}$光子/e $^{-}$ cm $^{-1}$ bar $^{-1}$以上。在1.5 kV cm $^{-1}$条$^{-1}$（通常用于电致发光的值）以上，估计NBrS以约1光子/ePDMATHABMN cm $^{-1}$条$^{-1}$的强度存在，这比常规的基于准分子的电致发光低约两个数量级。尽管比其准分子对应物更微弱，但我们的计算表明，NBrS引起发光背景，其可以在气相或液相中干扰区分和/或精确测量低初级闪烁信号（S1）的能力。特别是，我们表明，这是在“缓冲”和“否决”区域的情况下，保持低于电致发光（EL）阈值的电场将不足以熄灭二次闪烁。应仔细选择这些区域中的电场，以避免NBrS发射的不可容忍水平。此外，我们表明，这种新的光源的光发射开辟了一条…
Detection of scintillation light in noble gases with wavelength-shifting optical fibers
Donostia International Physics Center, BERC Basque Excellence Research Centre（多诺西亚国际物理中心，BERC巴斯克卓越研究中心）；Ikerbasque (Basque Foundation for Science)（伊克拉巴斯克（巴斯克科学基金会））；Instituto de Física Corpuscular (IFIC), CSIC & Universitat de València（粒子物理研究所（IFIC），西班牙国家研究委员会与瓦伦西亚大学）；Department of Physics, Universidad del Pais Vasco (UPV/EHU)（巴斯克国立大学（UPV/EHU）物理系）；Nuclear Research Center Negev（内盖夫核研究中心）
