一种抑制离子回流的被动栅网研究
Study of a Passive Gating Grid for Ion Back Flow Suppression
摘要：
空间电荷（SC）畸变是高分辨率时间投影室（TPC）的一些主要问题。两个主要的SC源是来自初级电离的SC源和来自放大级的SC源。需要增益级将电子信号增加到电子噪声水平以上，但这不可避免地产生额外的离子。这些离子可以进入漂移区并使电场失真，从而降低检测器性能。我们将提出一个简短的动机，我们的离子回流（IBF）的研究，以及现有的技术和我们的模拟结果，以减少IBF的解释。我们提出了几种网格结构，以及静态双极门控。此外，我们讨论了由于静态双极网格的电子轨迹中的位置失真，并使用这些失真来补偿我们的锯齿形焊盘读出的非线性响应。
英文摘要：
Space Charge (SC) distortions are some of the main issues for high-resolution Time Projection Chambers (TPC). The two main SC sources are those from primary ionizations and those that result from amplification stages. The gain stages are required to increase the electron signal above electronics noise levels, but this inevitably creates extra ions. These ions can enter the drift region and distort the electric field, and thus lower the detector performance. We will present a brief motivation for our Ion Back Flow (IBF) studies along with explanations of existing techniques and our simulation results to reduce IBF. We propose several mesh structures along with static bi-polar gating. Further, we discuss position distortions in electron trajectories due to a static bi-polar grid and use these distortions to compensate for non-linear responses of our Zig-Zag pad readout.
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