TY - JOUR
T1 - Response of Large Nb-Based Tunnel Junction to X-Rays
AU - Maehata, Keisuke
AU - Yoshida, Shin Ichi
AU - Ishibashi, Kenji
AU - Nakagawa, Hiroshi
AU - Akoh, Hiroshi
AU - Joosse, Koen
AU - Takada, Susumu
AU - Katagiri, Masaki
AU - Kishimoto, Maki
AU - Ukibe, Masahiro
PY - 1997/10
Y1 - 1997/10
N2 - High quality Nb-based tunnel junctions with surface areas of 100 x 100 μm2 and 200 x 200 μm2 were tested by irradiating X-rays. According to the decrease in the disappearance of quasiparticles before tunneling, the 200 x 200 μm2 junction exhibited better X-ray response than that of 100 x 100 μm2 one. In the operation of the 200 x 200 μm2 junction, two kinds of stable operation modes with different pulse heights were found by applying a magnetic field with different ramping speeds. The higher pulse height mode was observed with a ramping-speed faster than about 200 G/s. After tuning of the bias current in the higher mode operation, the energy required for single electron collection was obtained to be 6.5meV and the junction detected 5.9keV X-rays of 55Mn with an energy resolution (FWHM) of 93eV. The 200 x 200 μm2 junction has the largest dimension among tunnel junctions exceeding silicon-semiconductor detectors in energy resolution.
AB - High quality Nb-based tunnel junctions with surface areas of 100 x 100 μm2 and 200 x 200 μm2 were tested by irradiating X-rays. According to the decrease in the disappearance of quasiparticles before tunneling, the 200 x 200 μm2 junction exhibited better X-ray response than that of 100 x 100 μm2 one. In the operation of the 200 x 200 μm2 junction, two kinds of stable operation modes with different pulse heights were found by applying a magnetic field with different ramping speeds. The higher pulse height mode was observed with a ramping-speed faster than about 200 G/s. After tuning of the bias current in the higher mode operation, the energy required for single electron collection was obtained to be 6.5meV and the junction detected 5.9keV X-rays of 55Mn with an energy resolution (FWHM) of 93eV. The 200 x 200 μm2 junction has the largest dimension among tunnel junctions exceeding silicon-semiconductor detectors in energy resolution.
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U2 - 10.1080/18811248.1997.9733773
DO - 10.1080/18811248.1997.9733773
M3 - Article
AN - SCOPUS:0038533567
SN - 0022-3131
VL - 34
SP - 979
EP - 982
JO - journal of nuclear science and technology
JF - journal of nuclear science and technology
IS - 10
ER -