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

(1)30%掺Er：YAG结壳磁性能的测量我们在8T下测量了30%掺Er：YAG结壳在93mk~8K下的比热，并求出了磁熵。(2)金属磁量热计传感器的制作建立了真空中红外加热的Er：Au金属磁传感器的制作工艺。利用RF-SQUID在4.2K下直接测量了Er的浓度。(3)低温阶段的SQUID读出装置在3He低温恒温器中，在0.3K阶段引入了DC-SQUID读出磁力量热计的放大器。并为鱿鱼设置了磁屏蔽，成功实现了鱿鱼在磁场作用下的驱动。(4)观测与理论。对星际介质的研究。我们用ASCA和Chandra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，计算了温热星际介质氧发射线的发射率，并讨论了高能量分辨率X射线探测器的探测能力。

(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.