利用Chambers微光子晶体磁探测器对暗物质的定向探测
Directional detection of Dark Matter with the MIcro-tpc MAtrix of Chambers
摘要：
与普通物质弱相互作用的粒子，其相关质量为原子核（WIMPs）量级，是暗物质的可能候选者。由这些WIMP之一引起的靶核的弹性碰撞的直接检测必须与由中子产生的信号区分开，中子产生的信号在检测器中留下相同的信号。MIMAC（MIcro-tpc MAGNETIC of Chambers）合作开发了一种原始的原型探测器，该探测器将大型像素化Micromegas与快速自触发电子器件相结合。介绍了Modane地下实验室中运行的双室模块的各个方面：$^{222}$ Rn子体的校准和表征。建立了一个新的实验台，它结合了MIMAC室和COMIMAC便携式淬火线，用于表征MIMAC混合气体中低能离子的三维径迹：给出了初步结果。简要讨论了今后的步骤。
英文摘要：
Particles weakly interacting with ordinary matter, with an associated mass of the order of an atomic nucleus (WIMPs), are plausible candidates for Dark Matter. The direct detection of an elastic collision of a target nuclei induced by one of these WIMPs has to be discriminated from the signal produced by the neutrons, which leaves the same signal in a detector. The MIMAC (MIcro-tpc MAtrix of Chambers) collaboration has developed an original prototype detector which combines a large pixelated Micromegas coupled with a fast, self-triggering, electronics. Aspects of the two-chamber module in operation in the Modane Underground Laboratory are presented: calibration, characterization of the $^{222}$Rn progeny. A new test bench combining a MIMAC chamber with the COMIMAC portable quenching line has been set up to characterize the 3D tracks of low energy ions in the MIMAC gas mixture: the preliminary results thereof are presented. Future steps are briefly discussed.
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