Development of superconducting tunnel junction detectors for high-resolution X-ray spectroscopy
Abstract
The energy resolution of aluminum superconducting tunnel junctions (Al-STJs) has been improved by the introduction of a metallic buffer layer underneath the junction. When irradiated by 5.9 keV X-rays, a resolution of 12 eV (FWHM) was achieved for a junction size of 100×100 μm 2. A mobile refrigerator system allowed to characterize these devices at the PTB-beamlines of the electron storage rings Bessy I and Bessy II. They showed linear energy response in the range between 200 eV and 6.5 keV and a strong increase in reduced energy events if irradiated at X-ray energies below the Al absorption edge at 1.56 keV.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- April 2000
- DOI:
- 10.1016/S0168-9002(99)01362-5
- Bibcode:
- 2000NIMPA.444..214A