| Research Collaborator |
TAKEMASA Kenichi 筑波大学, 数理物質系, 研究員 (40817508)
WAKASA Rena 筑波大学, 数理物質科学研究科, 大学院生
ASANO Chisa 筑波大学, 数理物質科学研究科, 大学院生
KASAHARA Kota 筑波大学, 数理物質科学研究科, 大学院生
KIUCHI Kenji 筑波大学, 数理物質科学研究科, 大学院生
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| Budget Amount *help |
¥70,850,000 (Direct Cost: ¥54,500,000、Indirect Cost: ¥16,350,000)
Fiscal Year 2017: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Fiscal Year 2016: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Fiscal Year 2015: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
Fiscal Year 2014: ¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2013: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
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| Outline of Final Research Achievements |
In this research, we have developed the superconducting tunnel junction (STJ) detector for cosmic background neutrino decay search COBAND experiment. We required that the STJ detector should measure the energy of a single far-infrared photon with an energy around 25meV with an energy resolution of 2% for this COBAND experiment. To satisfy the requirement, we have developed a cryogenic preamplifier which can operate at 0.4K and be placed close to the STJ detector. We succeeded in amplifying the Nb/Al-STJ signal to a laser pulse light by a factor of 70 and improving the signal-to-noise ratio significantly.
We have also developed Hf-STJ with higher energy resolution than Nb/Al-STJ, and succeeded in observing the Hf-STJ signal to a laser pulse light by decreasing the leakage current significantly.
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