Electron electric dipole moment search by using polarized ultracold molecule s

至于光电探测器的开发，我们已经采购了各种产品进行批量生产。例如，我们采购了光电传感器(硅光电倍增管：SiPM)，这是探测器最重要的部分。我们得到了相对低暗计数的单个传感器。由于抑制暗计数是研制过程中的关键环节之一，我们计划将SiPM冷却到露点以下，低暗计数个体缓解了探测器的冷却要求。为了减少读出激光散射产生的杂散光，我们定制了2片干涉带通滤光片，其消光比在~510 nm(信号波长)到大于700 nm(背景波长)之间进行了原型测试。在测试的基础上，我们确认了在保持信号波长90%以上透过率的情况下，杂散光抑制率足够高。我们还准备了各种外围硬件，如前置放大板和组件的部件，以及真空馈电组件。这一时期已经开始量产，可能在下一财年初完成。我们还在并行地建设操作软件和硬件。

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.