Development of X-ray detection system by using an on-chip coil inetgrated superconducting tunnel junction

使用片上线圈集成超导隧道结的X射线检测系统的开发

• 批准号: 12558056
• 负责人: MAEHATA Keisuke
• 金额: $ 7.68万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12558056/
• 关键词: X-ray detector; Superconducting tunnel junction; Microstrip coil integration; Dilution refrigerator; マイクロストリップコイル集積型素子; 極低温放射線検出器

An on-chip coil integrated superconducting tunnel junction (OC^2-STJ) was developed for high performance X-ray detector. The OC^2-STJ consists of a Nb-based junction and a superconducting microstrip coil deposited on the insulating layer deposited on the top electrode of the STJ. The microstrip coil generates the magnetic field in the insulating layer of the junction for suppression of Josephson current. The fabricated OC^2-STJ chip was mounted in a cooling capsule with the ^<55>Fe X-ray source. The cooling capsule was attached to the mixing chamber of a compact ^3He-^4He dilution refrigerator. The OC^2-STJ chip was held at a constant temperature in the capsule against the Joule heat generation in the current feed line of the strip coil during the detector operation. Electric charges produced by tunneling of excited quasiparticles by incident X-rays were collected by a charge sensitive preamplifier. To reduce noise components in the output signals, a field effect transistor (FET) of the signal input was placed on the 1 K pot of the refrigerator through a weak thermal link. The temperature of the input FET was regulated at 100 K by a heater to generate the output voltage pulses with the minimum noise equivalent charge. The temperature of the OC^2-STJ chip was kept around 600 mK with regulating the FET temperature at 1 K. In the operation of the OC^2-STJ for X-ray detection, the current from 10 to 30 mA was supplied to the microstrip coil. Response characteristics were obtained for a diamond-shaped Nb-based tunnel junction with a sensitive area of 100 × 100 μm^2 in the OC^2-STJ chip. A stable operation of the OC^2-STJ was demonstrated without using usual external electromagnets.

研制了一种用于高性能X射线探测器的片上线圈集成超导隧道结（OC^2-STJ）。OC^2-STJ由Nb基结和沉积在STJ顶部电极上的绝缘层上的超导微带线圈组成。微带线圈在结的绝缘层中产生磁场，用于抑制约瑟夫森电流。将制造好的OC ^2-STJ芯片安装在带有13 Fe X射线源的冷却舱中<55>。冷却舱连接在一台紧凑的^3He-^4He稀释制冷机的混合室上。在检测器操作期间，将OC ^2-STJ芯片保持在胶囊中的恒定温度下，以抵抗带状线圈的电流馈线中的焦耳热产生。用电荷灵敏探测器收集入射X射线激发准粒子隧穿产生的电荷。为了减少输出信号中的噪声分量，信号输入的场效应晶体管（FET）通过弱热链路放置在制冷机的1 K电位器上。通过加热器将输入FET的温度调节在100 K，以产生具有最小噪声等效电荷的输出电压脉冲。通过将FET温度调节在1 K，将0C^2-STJ芯片的温度保持在600 mK左右。在用于X射线检测的OC ^2-STJ的操作中，向微带线圈提供10至30 mA的电流。获得了灵敏面积为100 × 100 μm^2的菱形Nb基隧道结的响应特性。在不使用通常的外部电磁铁的情况下，OC^2-STJ可以稳定工作。

项目成果

Keisuke Maehata et al.: "Operation Test System of Superconducting Tunnel Junction Photon Detectors Using A Compact ^3He-^4He Dilution Refrigerator"RIKEN Review. No.47. 24-27 (2002)

Keisuke Maehata 等人：“使用紧凑型 ^3He-^4He 稀释制冷机的超导隧道结光子探测器的运行测试系统”RIKEN 评论。

Toni Taino et al.: "On-chip coil integrated superconducting tunnel junction for a high performance X-ray detector"Physica C. Vol.372-376. 403-406 (2002)

Toni Taino 等人：“用于高性能 X 射线探测器的片上线圈集成超导隧道结”Physica C. Vol.372-376。

Keisuke Maehata et al.: "X-ray detection by an on-chip coil integrated superconducting tunnel junction"Review of Scientific Instruments. the 07/01/03 issue(to be published).

Keisuke Maehata 等人：“通过片上线圈集成超导隧道结进行 X 射线检测”科学仪器评论。

Keisuke Maehata et al.: "Response of On-Chip Coil Integrated Saperconducting Tunnel Junction to X Rays"Journal of Applied Physics. 24(to be published). (2003)

Keisuke Maehata 等人：“片上线圈集成 Saperconducting 隧道结对 X 射线的响应”应用物理学杂志。

Keisuke Maehata et al.: "X-ray detection by an on-chip coil integrated superconducting junction"Review of Scientific Instruments. (to be published). (2003)

Keisuke Maehata 等人：“通过片上线圈集成超导结进行 X 射线检测”科学仪器评论。