Towards FAIR: first measurements of metallic magnetic calorimeters for high-resolution x-ray spectroscopy at GSI
Towards FAIR: first measurements of metallic magnetic calorimeters for high-resolution x-ray spectroscopy at GSI
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DOI：
10.1088/0031-8949/2015/t166/014054
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发表时间：
2015-11-01
期刊：
影响因子：
2.9
通讯作者：
Enss, C.
中科院分区：
文献类型：
--
作者：
Hengstler, D.;Keller, M.;Enss, C.
金属磁力量热仪是一种能量分散型粒子探测器，工作温度低于100MK。应用于X射线光谱学，它们结合了晶体光谱仪的高能量分辨率和半导体探测器的大能量带宽。光子被吸收后，它的能量被转化为热。顺磁合金将温度变化转换为磁化变化，由灵敏的超导量子干涉设备磁强计读出。利用这种金属量热计，我们在GSI实验储存环的内部气体靶上成功地进行了两次测量。在第一束时间中，类锂Au离子分别对准N-2和Xe气体靶。在第二束时间内，我们观察到一束裸Xe离子与Xe气体靶相互作用的射束。在这两个实验中，我们都获得了从0keV到60keV的低于60 eV的能量分辨率。我们能够探测到不同电荷态的Xe离子的K线，包括Ly-ETA的Lyman系列，并能在类H Xe中分辨Ly-β-二重态。
Metallic magnetic calorimeters are energy dispersive particle detectors that are operated at temperatures below 100 mK. Applied to x-ray spectroscopy they combine the high energy resolution of crystal spectrometers with the large energy bandwidth of semiconductor detectors. After the absorption of a photon its energy is converted into heat. A paramagnetic alloy converts the temperature change into a change of magnetization that is read out by a sensitive superconducting quantum interference device magnetometer. With such a metallic magnetic calorimeter we performed two successful measurements at the internal gas target of the experimental storage ring at GSI. In the first beamtime lithium-like Au-ions were targeted on a N-2 and a Xe gas target, respectively. In the second beamtime we observed a projectile beam of bare Xe ions interacting with a Xe gas target. In both experiments we achieved an energy resolution below 60 eV from 0 keV to 60 keV. We were able to detect K-lines of Xe ions of different charge states, including the Lyman series up to Ly-eta and could resolve the Ly-beta-doublet in H-like Xe.