论文信息 - High-resolution superconducting X-ray spectrometers with aluminum trapping layers of different thicknesses

High-resolution superconducting X-ray spectrometers with aluminum trapping layers of different thicknesses

Superconducting tunnel junctions coupled to superconducting absorbers may be used as high-resolution, high-efficiency X-ray spectrometers. We have tested devices with niobium X-ray absorbing layers coupled to aluminum layers that serve as quasiparticle traps. We present a study of device performance as a function of thickness of the trapping layers. We measured the best energy resolution using a device with a high-quality barrier and 200 nm-thick trapping layers on both sides of the tunnel barrier. This energy resolution was 36 eV full width at half maximum at 6 keV, about 4 times better than that obtainable using semiconductor ionization detectors.<<ETX>>

[1] D. J. Goldie,et al. Statistical noise due to tunneling in superconducting tunnel junction detectors , 1994 .

[2] Anthony J. Peacock,et al. The properties of niobium superconducting tunneling junctions as X-ray detectors , 1992 .

[3] Cheng-Chung Chi,et al. Quasiparticle and phonon lifetimes in superconductors , 1976 .

[4] Kenneth E. Gray,et al. A superconducting transistor , 1978 .

[5] Simon E. Labov,et al. Nonequilibrium dynamics in superconducting tunnel junction detectors , 1994, Optics & Photonics.

[6] A. Silva,et al. Low noise front end electronics for dilution refrigerator experiments , 1993 .

[7] M. Kurakado,et al. Possibility of high resolution detectors using superconducting tunnel junctions , 1982 .

[8] R. Ruby,et al. A simple and robust niobium Josephson junction integrated circuit process , 1991 .

[9] J. Clarke,et al. Quasiparticle branch mixing rates in superconducting aluminum , 1979 .

[10] Simon E. Labov,et al. High-resolution superconducting x-ray detectors with two aluminum trapping layers , 1993 .

[11] M. L. Le Gros,et al. Energy resolving X-ray detectors using niobium absorbers and multiple quasiparticle tunneling between two aluminum traps , 1993, IEEE Transactions on Applied Superconductivity.

[12] R. F. Broom,et al. Modeling of Characteristics for Josephson Junctions Having Nonuniform Width or Josephson Current Density , 1980, IBM J. Res. Dev..