Response of a dielectric microcalorimeter operating with a feed-back of detection pulse signa

介电微量热计的响应与检测脉冲信号的反馈操作

基本信息

批准号：
14380237
负责人：
MAEHATA Keisuke
金额：
$ 6.08万
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：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The microcalorimeter detects a single particle of radiation by means of the temperature rise in the absorber kept at low temperatures below 1 K. A sensitive thermometer is important component in the microcalorimeter. The electric capacitance of 0.99SrTiO_3-0.01SrTa_2O_6 dielectric materials exhibits the temperature dependence and the minimum value below 200 mK. The temperature dependence of the electric capacitance can be utilized for the sensitive thermometer of the microcalorimeter. By applying a constant DC voltage, a change in the electric capacitance alters the electric charge stored in the dielectric capacitor. In the dielectric microcalorimeter, the temperature rise induced by the incident radiation is converted to the electric charge proportional to the change in the electric capacitance of the dielectric material. Because of no current-flow across the dielectric device, the dielectric microcalorimeter has advantage of suppression of the Johnson noise and the Joule heat generat … More ion in the device. The temperature dependence of electric capacitance d(ln C_d)/dT of the material is important parameter for the dielectric thermometer. We fabricated 0.99SrTiO_3-0.01SrTa_2O_6 dielectric samples. The experimental value of d(ln C_d)/dT of the dielectric sample was -2.02 at 100mK. However reproducibility in values of d(ln C_d)/dT was not obtained for prototype thermometers made of 0.99SrTiO3-0.01SrTa2O6 dielectric samples. After several researches, the behavior of the value of d(ln C_d)/dT below 1K was found to be affected by a nonstoichiometry between SrO and TiO_2 in 0.99SrTiO_3-0.01SrTa_2O_6 dielectric materials. We fabricated a prototype dielectric microcalorimeter using 0.99SrTiO_3-0.01SrTa_2O_6 dielectric materials. After cooled down below 100 mK by operating a liquid helium-free compact dilution refrigerator, the dielectric microcalorimeter was irradiated by alpha particles emitted from ^<241>Am source. The dielectric microcalorimeter detected 5.5 MeV alpha particles. By applying the bias voltage of 110 V, the pulse height of the detection signal was 1.6 V at the output of a charge sensitive preamplifier. In this study, we demonstrated potential of excellent detection performance of the dielectric microcalorimeter. Less

微钙化计通过在低温低于1 k的吸收器保持的温度升高来检测一个辐射的单个粒子。敏感温度计是微量钙化计的重要组成部分。 0.99SRTIO_3-0.0.01SRTA_2O_6的电容含量为DieElectric材料的温度依赖性和低于200 MK的最小值。电容的温度依赖性可用于微钙化计的敏感温度计。通过施加恒定的直流电压，电容的变化改变了饮食电容器中存储的电荷。在温和的微钙化计中，入射辐射引起的温度升高被转化为与顽固材料的电容变化成正比的电荷。由于在饮食装置上没有电流流量，因此温和的微量钙化计具有抑制Johnson噪声和Joule热发生器的优势……该设备中的离子更多。材料的电容D（LN C_D）/DT的温度依赖性是饮食温度计的重要参数。我们制造了0.99SRTIO_3-0.01SRTA_2O_6饮食样品。 Digit样品的D（LN C_D）/DT的实验值为-2.02在100MK时为-2.02。然而，对于由0.99SRTIO3-0.01SRTA2O6饮食样品制成的原型温度计，未获得D（LN C_D）/DT值的可重复性。经过多次研究，发现D（LN C_D）/DT低于1K的值的行为受到0.99SRTIO_3-0.3-0.01SRTA_2O_2O_6饮食材料的sRO和TIO_2之间的非静色计量的影响。我们使用0.99SRTIO_3-0.01SRTA_2O_6饮食材料制造了原型的日营微钙化仪。通过操作无液体氦的紧凑稀释冰箱冷却低于100 mk后，字典微含量计被从 ^<241> AM源发出的α颗粒照射。字典微晶仪检测到5.5 MEVα颗粒。通过施加110 V的偏置电压，在电荷敏感前置放大器的输出时，检测信号的脉冲高度为1.6 V。在这项研究中，我们证明了词典微钙化计的出色检测性能的潜力。较少的