用氦微兆气体微型TPC进行低能测量
Low energy measurements with Helium Micromegas micro-TPC
摘要：
介质中粒子电离的测量在从计量学到粒子物理学和宇宙学的许多领域都引起了极大的兴趣。电离猝灭因子定义为介质中反冲电离释放的能量与其动能的比值。在低能量下，在几keV的范围内，电离迅速下降，需要系统的测量。我们已经开发了一个实验装置，专门用于测量低能（keV）电离淬灭因子的MIMAC项目。气体中产生的电离已经用充满氦气混合物的Micromegas检测器测量。
英文摘要：
The measurement of the ionization produced by particles in a medium presents a great interest in several fields from metrology to particule physics and cosmology. The ionization quenching factor is defined as the fraction of energy released by ionisation by a recoil in a medium compared with its kinetic energy. At low energy, in the range of a few keV, the ionization falls rapidly and systematic measurement are needed. We have developped an experimental setup devoted to the measurement of low energy (keV) ionization quenching factor for the MIMAC project. The ionization produced in the gas has been measured with a Micromegas detector filled with Helium gas mixture.
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