Negative Ion Time Projection Chamber operation with SF6 at nearly atmospheric pressure
Negative Ion Time Projection Chamber operation with SF6 at nearly atmospheric pressure
复制标题
负离子时间投影室在接近大气压的条件下使用 SF6 进行操作
DOI：
10.1088/1748-0221/13/04/p04022
复制
发表时间：
2017
影响因子：
1.3
通讯作者：
S. Tomassini
中科院分区：
文献类型：
--
作者：
E. Baracchini;G. Cavoto;G. Mazzitelli;F. Murtas;F. Renga;S. Tomassini
我们介绍了使用基于SF6的混合气体对新型粒子跟踪探测器的负离子漂移速度和迁移率的测量。这种气体最近在定向暗物质搜索的背景下受到了关注，这要归功于它的高氟含量、减少扩散和多种电荷载流子，这使得探测器完全可信化。我们用漂移距离为5 cm的负离子时间投影室进行的测量表明，在75托至150托的纯SF6中，通过三倍薄宝石放大，负离子运转的可能性，证实了这种气体的吸引潜力。最重要的是，我们对He：CF4360：SF6360：240：10Torr混合物的结果首次证明了SF6−负离子漂移和气体增益在近大气压下在He中的可行性，为下一代定向暗物质探测器开辟了非常有趣的前景。
We present the measurement of negative ion drift velocities and mobilities for innovative particle tracking detectors using gas mixtures based on SF6. This gas has recently received attention in the context of directional Dark Matter searches, thanks to its high Fluorine content, reduced diffusion and multiple species of charge carriers, which allow for full detector fiducialization. Our measurements, performed with a 5 cm drift distance Negative Ion Time Projection Chamber, show the possibility of negative ion operation in pure SF6 between 75 and 150 Torr with triple thin GEM amplification, confirming the attractive potentialities of this gas. Above all, our results with the mixture He:CF4:SF6 360:240:10 Torr demonstrate for the first time the feasibility of SF6− negative ion drift and gas gain in He at nearly atmospheric pressure, opening very interesting prospects for the next generation of directional Dark Matter detectors.