Effect of On-Chip Magnetic Shielding for TES Microcalorimeters
Effect of On-Chip Magnetic Shielding for TES Microcalorimeters
复制标题
TES 微热量计片上磁屏蔽的效果
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Tanaka
中科院分区：
文献类型：
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作者：
Y. Ishisaki;H. Kurabayashi;A. Hoshino;T. Ohashi;T. Yoshino;T. Hagihara;K. Mitsuda;K. Tanaka
我们研究了Ti/Au双层TES微量热计的X射线脉冲高度和临界电流与磁场的关系。的脉冲高度的强烈影响的磁场强度施加垂直于TES表面。我们发现，在零温度下的临界电流，Ic 0，通过施加10 μT的磁场减少了2倍。我们的数据与Ginzburg-Landau理论预测的TES灵敏度与（I/Ic 0）-2/3成比例一致。这一事实意味着TES的R-T曲线的形状部分地由超导体的临界电流决定。为了使我们的TES微量热计对外部磁场不那么敏感，我们制造了配备片上磁屏蔽的设备。一种装置具有由Al制成的回转式电引线，其中返回线铺设在Ti/Au TES下方。另一种装置具有沉积在多层膜之间的Nb层。我们证明，这些设备可在200 μT以下使用，脉冲高度和能量分辨率略有下降。
We investigated the magnet field dependence of the X-ray pulse height and the critical current of a Ti/Au bilayer TES micro-calorimeter. The pulse height was strongly affected by the magnetic field intensity applied perpendicularly to the TES surface. We found that the critical current at zero temperature, Ic0, decreased by a factor of two by applying a magnet field of ∼10 μT. Our data are consistent with a TES sensitivity proportional to (I/Ic0)−2/3, as predicted by the Ginzburg-Landau theory. This fact implies that the shape of the R–T curve of the TES is partly determined by the critical current of the superconductor. In order to make our TES microcalorimeters less sensitive to the external magnetic field, we fabricated devices equipped with on-chip magnetic shielding. One device has a turn-around style electrical lead made of Al, in which the return line is laid beneath the Ti/Au TES. Another device has a Nb layer deposited between a multi-layer membrane. We demonstrated that the devices were usable below 200 μT with small degradation of the pulse height and energy resolution.