Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phyb..263..595p&link_type=abstract
Physica B: Physics of Condensed Matter, Volume 263, Issue 1-4, p. 595-603.
Astronomy and Astrophysics
Astrophysics
17
Superconducting Tunnel Junctions, Spectral Resolution, Astrophysics
Scientific paper
The current state of development of superconducting tunnel junctions as photon counting spectroscopic detectors is reviewed and their application to a broad range of astrophysical problems discussed. Arrays of tantalum based junctions have now reached a state of maturity such that serious astronomical applications can be considered over the wavelength range from 0.5 nm to 2 μm. The agreement between the theoretical resolution, as defined by the tunnel limited resolution, and measurements over this waveband, for both niobium and tantalum based devices, provides a good indication that lower critical temperature elemental superconductors may provide an even improved resolution in the near future. Such devices based on hafnium with a critical temperature of ~130 mK are already under development.
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