Title :
Spatially resolved study of superconducting tunnel junctions X-ray detectors by low temperature scanning synchrotron microscopy
Author :
Pressler, Harald ; Ohkubo, Masataka ; Koike, Masaki ; Zama, Tatsuya ; Fukuda, Daiji ; Kobayashi, Naoto
Author_Institution :
Quantum Radiat. Div., Electrotech. Lab., Tsukuba, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
A low temperature scanning synchrotron microscope (LTSSM) has been developed for spatial analysis of superconducting tunnel junction X-ray detectors. One and two-dimensional images of the detector response to X-rays were measured by scanning the junctions kept at a working temperature of about 0.4 K with a highly collimated synchrotron radiation beam. The collimation was performed by inserting a pinhole mounted on a scanning unit into the synchrotron radiation in the range of 3-6 keV. The spatial resolution of the LTSSM is between 5 and 10 micrometer. The present results indicate a large discrepancy between the experimental spatial response and a quasiparticle diffusion and edge-loss model. The LTSSM plays an important role in the development of cryogenic X-ray detectors
Keywords :
X-ray detection; low-temperature techniques; quasiparticles; scanning tunnelling microscopy; superconducting junction devices; superconducting particle detectors; superconductive tunnelling; synchrotron radiation; 0.4 K; 3 to 6 keV; cryogenic X-ray detector; edge loss; low temperature scanning synchrotron microscopy; one-dimensional imaging; quasiparticle diffusion; spatial resolution; superconducting tunnel junction; synchrotron radiation beam collimation; two-dimensional imaging; Collimators; Josephson junctions; Microscopy; Radiation detectors; Spatial resolution; Synchrotron radiation; Temperature; X-ray detection; X-ray detectors; X-ray imaging;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
