Development of novel superconducting detectors for a measurement of neutrino mass using tritium beta decays

我们已经开发了MKID(微波动力学电感探测器)，用于精确测量在氚衰变中由β射线和反冲核沉积的能量。我们首先制作了被广泛接受的微带MKID，但发现它们不能满足我们的要求。经过深入的研究，我们确定了产生这种现象的原因是由SiO_2、Al_2O_3等组成的绝缘层的介电损耗。在此基础上，我们研制出了性能良好的共面波导MKID。我们确认了MKID的可见光反应。

We have developed MKIDs(Microwave Kinetic Inductance Detectors) to make accurate measurements of energy deposited by the beta rays and recoil nuclei in tritium decays. We first fabricated microstrip MKIDs which have large acceptance, but they are found not to satisfy our requirements. With intensive studies, we have identified the cause as the dielectric loss in the insulator layer made of SiO_2, Al_2O_3, etc. We then developed CPW(coplanar waveguide) type MKIDs, which have shown good performance. We confirmed a visible light response of the MKIDs.