标题： ATLAS ITk条形模块的扩展热循环测试，有和没有应力缓解中介层的情况 显示英文标题

标题： Extended thermal cycling of ATLAS ITk strip modules with and without stress mitigating interposers

摘要： 本文研究了ATLAS内跟踪器条形预生产模块在独立热循环过程中的临界机械故障。 五个模块在充分调整热夹具并引入无人操作互锁装置后进行了延长的热循环。 通过定期的传感器计量来跟踪模块弯曲的变化。 所有五个模块在将最大循环温度从$20^\circ$C 提高到$40^\circ$C 时，平均弯曲增加量为$146\pm 27~\mu$m。四个这样的模块在循环到$-44^\circ$C 时出现传感器断裂。引入了一种由硅胶层和Kapton薄膜插入器组成的应力缓解层，用于另外三个模块，详细的质量控制数据确立了其机电可行性。 在相对于$[+20, -44]^\circ$C 的$[+40, -44]^\circ$C 之间进行十次循环后，未观察到$1\pm 10~\mu$m 的显著弯曲变化。两个中介模块经受了 200 次热循环至$[+56, -44]^\circ$C 而没有发生断裂。这种减少的传感器变形和断裂被解释为热应力减小的证据。 显示英文摘要

摘要： This paper investigates critical mechanical failures during stand-alone thermocycling of ATLAS Inner Tracker strip pre-production modules. Five modules undergo extended thermocycling after adequately levelling thermal chucks and introducing interlocks for unattended operation. Module bow evolution is tracked via regular sensor metrology. All five modules exhibit bow increases with a mean of $146\pm 27~\mu$m when raising maximum cycling temperatures from $20^\circ$C to $40^\circ$C. Four such modules exhibit sensor fractures when cycled to $-44^\circ$C. A stress-mitigating layer of silicone gel and Kapton film interposer is introduced to three further modules, with detailed quality control data establishing electromechanical viability. No significant bow change of $1\pm 10~\mu$m is observed after ten cycles between $[+40, -44]^\circ$C relative to $[+20, -44]^\circ$C. Two interposer modules undergo 200 thermocycles up to $[+56, -44]^\circ$C without fracturing. This decreased sensor deformation and fracturing is interpreted as evidence for reduced thermal stress.