Flux trapping in superconducting integrated circuits cause circuits to operate with reduced margins, or to fail completely. Moats are used in superconducting ground planes to create low energy locations for flux trapping. Moat design and placement strategies have been presented before, and several experiments published to evaluate moat efficiency. Although fluxons can be steered to moats to prevent trapping in or near Josephson junctions or inductive interconnects, the flux in a moat couples to nearby structures and induces dc currents in superconducting loops. In this paper, we discuss a set of numerical simulation tools for flux trapping analysis, developed under the IARPA SuperTools project. These tools are used to extract compact models for magnetic flux trapped in moats, including the magnetic coupling to superconducting structures. An open-source superconducting transient simulation engine, called JoSIM, is used to simulate these compact models. To evaluate the magnetic co...

中文翻译：

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助焊剂捕获实验以验证仿真模型

超导集成电路中的助焊剂捕获会导致电路以降低的裕度运行或完全失效。护城河用于超导接地层中，以产生低能量的位置来捕获通量。护城河的设计和放置策略已经在之前提出过，并且发表了一些评估护城河效率的实验。尽管可以将磁通量引导到at沟，以防止陷在约瑟夫逊结或感应互连中或附近，但，沟中的磁通耦合到附近的结构，并在超导环路中感应出直流电流。在本文中，我们讨论了一组在IARPA SuperTools项目下开发的用于通量捕获分析的数值模拟工具。这些工具用于提取护城河中的磁通量的紧凑模型，包括与超导结构的磁耦合。名为JoSIM的开源超导瞬态仿真引擎用于仿真这些紧凑模型。评估磁性...