We present the optimization method for the electron multiplying charge coupled devices of the acquisition system of the SPARC4 (OMASS4). The OMASS4 uses as figures of merit the signal-to-noise ratio (SNR) and the acquisition rate (AR) as a function of the operation mode of the CCDs. Three different modes of optimization are included in the OMASS4: (1) optimization of SNR only; (2) optimization of AR only; and (3) optimization of both SNR and AR simultaneously. The first two modes calculate an analytical maximization of the cost function, whereas the third mode uses the Bayesian optimization method to determine the optimum mode of operation. We apply the OMASS4 to find the optimum mode for observations obtained at the Pico dos Dias Observatory, Brazil and compare the delivered modes of operation and its performance with the ones adopted by the observer. If the OMASS4 had been used as a tool to optimize the CCDs in all of these nights, it would be possible to improve their efficiency in 97.17%, 65.08%, and 77.66% for the optimization modes 1, 2, and 3, respectively.

中文翻译：

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SPARC4采集系统EMCCD工作参数优化

我们提出了SPARC4（OMASS4）采集系统的电子倍增电荷耦合器件的优化方法。OMASS4 使用信噪比 (SNR) 和采集率 (AR) 作为品质因数作为 CCD 操作模式的函数。OMASS4 中包含三种不同的优化模式： (1) 仅优化 SNR；(2) 仅优化AR；(3) 同时优化 SNR 和 AR。前两种模式计算成本函数的分析最大化，而第三种模式使用贝叶斯优化方法来确定最佳操作模式。我们应用 OMASS4 来寻找在 Pico dos Dias 天文台获得的观测的最佳模式，巴西，并将交付的操作模式及其性能与观察员采用的模式进行比较。如果在所有这些夜晚都使用 OMASS4 作为优化 CCD 的工具，那么对于优化模式 1、2 和 3，它们的效率将分别提高 97.17%、65.08% 和 77.66%。