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- Title
Toward 1000-Pixel Superconducting-Tunnel-Junction Detectors for X-Ray Absorption Fine Structure Spectroscopy.
- Authors
Fujii, G.; Ukibe, M.; Shiki, S.; Ohkubo, M.
- Abstract
Superconducting tunnel junction (STJ) detectors have excellent energy resolution, high detection efficiency, and high counting rate in the soft X-ray energy range. These properties are suitable for synchrotron radiation facilities. However, in order to achieve a high throughput analysis for dopants with a lower concentration, the pixel number of STJ array detectors should be further increased to enlarge the sensitive area. As a first step, we have fabricated 400-pixel STJ array detectors and checked the operation yield and the uniformity of leakage current ( $$I_{leak}$$ ) values. Fabricated STJs showed excellent current-voltage curves having low subgap current. The operation yield of STJs with $$I_{leak}$$ values of less than 10 nA was 96 $$\%$$ . The average $$I_{leak}$$ of 3.6 nA is roughly equivalent to that of the 100-pixel STJ array detector, which is open to users at synchroton radiation beam lines and have 12 eV energy resolution at 400 eV.
- Subjects
SUPERCONDUCTING junction devices; X-ray detection; X-ray absorption; X-ray spectroscopy; HIGH resolution spectroscopy; SYNCHROTRON radiation
- Publication
Journal of Low Temperature Physics, 2014, Vol 176, Issue 3/4, p255
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-014-1123-7