Development of Magnetic Calorimeter for the Search of Intergalactiv Medium by X-Ray Observation

(1) 30%掺铒YAG地壳磁性能的测量我们测量了30%掺铒YAG地壳的比热，得到了8T下93mk ~ 8K时的磁熵。(2)金属磁量热计传感器的制备建立了利用红外加热器在真空室中制备Er:Au金属磁传感器的工艺。用RF-SQUID在4.2K下直接测定Er的浓度。(3)低温级SQUID读出装置介绍了在3He低温恒温器0.3K级时，用于磁量热计读出的edc -SQUID放大器。设置了SQUID的磁屏蔽，成功实现了SQUID在磁场下的驱动。(4)观测和理论。星系间介质的研究。我们利用ASCA和钱德拉观测得到了几个星系团的温度和金属分布。在SPH模拟的基础上计算了星系间温热介质中氧发射线的发射率，并讨论了高能分辨x射线探测器的可探测性。

(1)Measurement of the magnetic properties of 30% Er-doped YAG crustalWe measured the specific heat of 30% Er-doped YAG crustal and derived the magnetic entropy at 93mk〜8K under 8T.(2)Fabrication of the metallic magnetic calorimeter sensorsFabrication process of Er:Au metallic magnetic sensor utilizing IR heater in a vacuum chamber has been established. The concentration of Er were directly measured by RF-SQUID at 4.2K.(3)Setup of SQUID readout at low temperature stageDC-SQUID amplifier for the readout of magnetic calorimeters was introduced at 0.3K stage in a 3He cryostat. Magnetic shield for the SQUID was also set and the SQUID was successfully drived under the magnetic field.(4)Observational and theoretical. studies of the intergalactic medium. We obtained temperature and metal distribution in several cluster of galaxies using ASCA and Chandra observation. The emissivity of oxygen emission line, from warm-hot intergalactic medium were calculated based on the SPH simulation and the detectability by X-ray detectors with high energy resolving power were discussed.