Electron electric dipole moment search by using polarized ultracold molecule s

至于光电探测器的开发，我们已经采购了大量生产的各种项目。例如，我们采购了光电传感器（硅光电倍增管：SiPM），这是检测器的最重要部分。我们有相对低暗计数的单个传感器。由于抑制暗计数是开发的关键点之一，我们计划将SiPM冷却到露点以下，低暗计数的个体减轻了探测器的冷却要求。为了减轻读出激光散射的杂散光，我们采购了2片定制的干涉带通滤光片，对于原型测试，其在~ 510 nm（信号波长）和长于700 nm（背景波长）之间具有大的消光比。通过测试，我们确认了杂散光抑制率足够高，同时信号波长的透过率保持在90%以上。我们还准备了各种外围硬件，如主板和组件的零件，以及真空馈通组件。批量生产已经在这段时间内开始，预计将在下一个财政年度开始时完成。我们还在并行构建操作软件和硬件。

As for the photodetector development, we have procured various items for mass production. For example, we procured photosensors (Silicon photomultiplier: SiPM) which are the most important part of the detector. We got relatively low-dark count individual sensors. Since suppressing the dark count is one of the crucial points in the development, we plan to cool the SiPMs below the dew point, the low-dark count individuals mitigate the cooling requirements of the detectors.In order to mitigate stray light from the readout laser scattering, we procured 2 pieces of custom-made interference bandpass filters, which have a great extinction ratio between ~510nm (signal wavelength) and longer than 700 nm (background wavelength) for a prototype test. Based on the test, we confirmed that the stray light suppression ratio is high enough while keeping over 90% transmission for the signal wavelength.We also prepared various peripheral hardware such as parts of preamplifier boards and assemblies, and vacuum feedthrough assemblies.Mass production has already been launched in this period and will be finished probably at the beginning of the next fiscal year. We are also constructing operating software and hardware in parallel.