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
|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)
|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.