Electro-optical testing and characterization of the Vera C. Rubin Observatory Legacy Survey of Space and Time Camera has shown that the focal plane charge-coupled devices developed by Imaging Technology Laboratory exhibit serial deferred charge signal in excess of the expected proportional deferred charge loss from global charge transfer inefficiency. We model the additional deferred charge as resulting from localized charge trapping in the serial register and from a signal-dependent electronic offset effect. A physically motivated forward deferred charge simulation algorithm and a reverse deferred charge correction algorithm were developed in order to correct for deferred charge during data reduction and reduce the possible impacts on Rubin Observatory project science goals. We apply the correction algorithm to calibration data and demonstrate the ability to reduce deferred charge signal measured in the overscan pixel regions and remove the serial pixel correlations resulting from the redistribution of charge between pixel neighbors during readout.

中文翻译：

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LSST 相机 ITL CCD 中串行延迟电荷的表征和校正

Vera C. Rubin Observatory Legacy Survey of Space and Time Camera 的光电测试和表征表明，由成像技术实验室开发的焦平面电荷耦合器件表现出的串行延迟电荷信号超过了预期的比例延迟电荷损失。全局电荷转移效率低下。我们对串行寄存器中的局部电荷俘获和依赖于信号的电子偏移效应产生的额外延迟电荷进行建模。开发了物理激励的正向延迟充电模拟算法和反向延迟充电校正算法，以便在数据减少期间校正延迟充电并减少对鲁宾天文台项目科学目标的可能影响。