Author/Authors :
Ootani، نويسنده , , W and Ikeda، نويسنده , , T and Kato، نويسنده , , H and Kawai، نويسنده , , K and Miyasaka، نويسنده , , H and Oku، نويسنده , , T and Otani، نويسنده , , C and Sato، نويسنده , , H and Shimizu، نويسنده , , H.M and Takizawa، نويسنده , , Y and Watanabe، نويسنده , , H and Nakagawa، نويسنده , , H and Akoh، نويسنده , , H and Aoyagi، نويسنده , , M and Taino، نويسنده , , T، نويسنده ,
Abstract :
X-ray detectors based on Nb/Al/AlOx/Al/Nb superconducting tunnel junctions (STJ) have been fabricated. X-ray responses of the fabricated STJs were measured by illumination with X-rays from a 55Fe electron capture source. The energy resolution of 41, 58 and 65 eV (FWHM) at 5.9 keV were obtained for 20×20, 100×100, 200×200 μm2, square-shaped devices, respectively. The X-ray measurements were performed at 0.35 K using a charge-sensitive preamplifier at room temperature. We also discussed the capability to suppress the substrate phonon events using Al2O3 insulation layer. An advantage for the combined use of the Al2O3 insulation layer and the sapphire substrate was demonstrated.
