重新审视ITACA：使用CMOS ASICs的离子跟踪装置
ITACA revisited: Ion Tracking Apparatus with CMOS ASICs
AI总结：
ITACA利用高压氙气TPC和电发光放大技术，通过电子轨迹和离子轨迹的成像，提高中微子less双β衰变搜索的灵敏度。
摘要：
高压氙气电发光放大（HPXeEL）技术能够提供详细的带电粒子轨迹拓扑重建，为中微子less双β衰变（0ββν）搜索提供独特的双电子信号。我们最近提出了一种名为ITACA的探测器概念，该探测器可以成像电子轨迹和对应的离子轨迹，由正离子以相反方向漂移。虽然电子快速漂向阳极进行标准EL成像，但正离子缓慢漂向阴极，具有毫米级扩散，允许时间确定事件能量和质心并定位可移动的离子探测器在离子云的预计到达点。我们提出了ITACA探测器的概念设计，回答了关键可行性问题。首先，我们定义了探测器几何形状和操作参数，用于1吨量级的仪器在15巴下的运行，包括模块化的电发光结构。其次，我们提出了磁性驱动旋转系统（MARS）的概念设计，该系统能够将离子传感器定位在阴极下方的任意（r，θ）坐标处，并证明预期的移动时间足够快，可以保留约95%的漂移体积用于离子检测，同时不显著扰动离子漂移的气体规模。第三，我们提出使用Topmetal CMOS ASIC基离子探测器作为我们原始工作中描述的分子传感器方法的替代方案，从而实现实时、三维的离子轨迹成像，而无需离线激光扫描。最后，我们估计了所提出装置的灵敏度，显示增强的拓扑判别力结合超低背景设计，使探索0ββν半衰期超过10^28年的可能性成为可能。
英文摘要：
High-pressure xenon gas TPCs with electroluminescent amplification (HPXeEL) provide detailed topological reconstruction of charged-particle trajectories, offering a distinctive two-electron signature for neutrinoless double beta decay ($0ββν$) searches. We have recently proposed ITACA, a detector concept that images both the electron track and the corresponding ion track, carried by the positive ions drifting in the opposite direction. While electrons drift rapidly to the anode for standard EL imaging, the positive ions drift slowly to the cathode with millimetre-scale diffusion, allowing time to determine the event energy and barycenter and to position a movable ion detector at the projected arrival point of the ion cloud. We present a conceptual design of the ITACA detector, addressing key feasibility questions. First, we define the detector geometry and operating parameters for a 1-tonne-scale instrument at 15 bar, including a modular tiled electroluminescent structure. Second, we present the conceptual design of the Magnetically Actuated Rotor System (MARS), the mechanism that positions the ion sensor at any $(r, θ)$ coordinate below the cathode, and show that the expected movement time is fast enough to retain $\sim95\%$ of the drift volume for ion detection, while not significantly perturbing the gas on the scales of the ion drift. Third, we propose using a Topmetal CMOS ASIC-based ion detector as an alternative to the molecular sensor approach described in our original work, enabling real-time, 3D imaging of the ion track without the need for offline laser scanning. Finally, we estimate the sensitivity of the proposed apparatus, showing that enhanced topological discrimination from the ion track, combined with an ultra-low background design, allows exploration of $0ββν$ half-lives in excess of $10^{28}$ yr.
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