Track length measurement of 19F+ ions with the MIMAC directional Dark Matter detector prototype
Track length measurement of 19F+ ions with the MIMAC directional Dark Matter detector prototype
复制标题
使用 MIMAC 定向暗物质探测器原型测量 19F 离子的轨迹长度
DOI：
10.1016/j.nima.2020.164569
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发表时间：
2021
影响因子：
1.4
通讯作者：
J. Busto
中科院分区：
文献类型：
--
作者：
Yi Tao;C. Beaufort;I. Morić;C. Tao;D. Santos;N. Sauzet;Camille Couturier;O. Guillaudin;J. Muraz;F. Naraghi;N. Zhou;J. Busto
弱相互作用大质量粒子（wimp）是暗物质最受欢迎的候选者之一。wimp应该与探测器的原子核相互作用。如果在直接探测实验中最终观察到一个强大的信号，那么确认其银河系起源的最佳特征将是核反冲轨迹的角度分布（Spergel, 1988）。MIMAC合作开发了一种低压气体探测器，既能提供动能，又能重建核反冲的三维轨迹。在本文中，我们报道了首次在5cm漂移原型MIMAC探测器中，在低动能范围（6 - 26kev），使用专门开发的离子束设备观察到19f核径迹。我们测量了后坐力轨迹长度，发现我们的测量值与标准模拟值之间存在显著差异。为了理解这些差异，我们进行了一系列的互补实验和模拟来研究扩散和整体系统的影响。我们显示了与轨道对应的数字化仪时间仓的数量与施加在Micromegas探测器512µm间隙上的电场的意外依赖关系。我们介绍了基于flash-ADC观测的修正，以重建雪崩前初级电子云的物理3D轨迹长度，并提出了这些修正背后的物理原理。我们表明需要考虑扩散和空间电荷效应来解释测量和标准模拟之间的差异。这些测量和模拟可能会对高增益TPC电离信号，特别是在低能量下的高增益TPC电离信号提供新的认识。
Weakly Interacting Massive Particles (WIMPs) are one of the most preferred candidates for Dark Matter. WIMPs should interact with the nuclei of detectors. If a robust signal is eventually observed in direct detection experiments, the best signature to confirm its Galactic origin would be the angular distribution of nuclear recoil tracks (Spergel, 1988). The MIMAC collaboration has developed a low pressure gas detector providing both the kinetic energy and three-dimensional track reconstruction of nuclear recoils. In this paper we report the first ever observations of19F nuclei tracks in a 5 cm drift prototype MIMAC detector, in the low kinetic energy range (6–26 keV), using specially developed ion beam facilities. We have measured the recoil track lengths and found significant differences between our measurements and standard simulations. In order to understand these differences, we have performed a series of complementary experiments and simulations to study the impact of the diffusion and overall systematics. We show an unexpected dependence of the number of digitizer time bins corresponding to the track on the electric field applied to the 512 µm gap of the Micromegas detector. We have introduced, based on the flash-ADC observable, corrections in order to reconstruct the physical 3D track length of the primary electron clouds before avalanches, proposing the physics behind these corrections. We show that diffusion and space charge effects need to be taken into account to explain the differences between measurements and standard simulations. These measurements and simulations may shed a new light on the high-gain TPC ionization signals in general and particularly at low energy.
暗物质时间投影室探测器的方向灵敏度测量
影响因子：
5
作者：
Deaconu C
通讯作者：
Deaconu C