极端能量事件项目新型氦基环保气体混合物的首批结果
First results on new helium based eco-gas mixtures for the Extreme Energy Events Project
AI总结：
EEE项目为降低温室气体排放，测试了氦与R1234ze组成的环保气体混合物，在不改动硬件下达到与原混合物相当的性能，报告了不同配比的首批结果。
摘要：
极端能量事件（EEE）项目是费米中心（物理史博物馆及“E.费米”研究中心）与INFN的联合项目，具有双重目的：一项关于地面宇宙射线的科学研究计划以及一项密集的推广和教育活动。该项目由约60个称为望远镜的跟踪探测器组成的网络构成，大部分安装在意大利高中。每个望远镜由三个多间隙阻性板室组成，迄今使用的气体混合物由98%的C$_2$H$_2$F$_4$和2%的SF$_6$组成。由于其高全球变暖潜能值，几年前EEE合作组开始了一项广泛的研发，致力于寻找环境可持续且与当前实验设置和操作环境兼容的替代混合物。在其他气体混合物中，在利用两台网络望远镜进行的初步测试中，含有氦和氢氟烯烃R1234ze的混合物给出了最佳结果。探测器已被证明能达到与先前混合物相当的性能水平，无需对硬件进行任何修改。我们将讨论使用不同比例的两种组分测试新混合物所获得的首批结果。
英文摘要：
The Extreme Energy Events (EEE) Project, a joint project of the Centro Fermi (Museo Storico della Fisica e Centro Studi e Ricerche "E.Fermi") and INFN, has a dual purpose: a scientific research program on cosmic rays at ground level and an intense outreach and educational program. The project consists in a network of about 60 tracking detectors, called telescopes, mostly hosted in Italian High Schools. Each telescope is made by three Multigap Resistive Plate Chambers, operated so far with a gas mixture composed by 98% C$_2$H$_2$F$_4$ and 2% SF$_6$. Due to its high Global Warming Potential, a few years ago the EEE collaboration has started an extensive R&D on alternative mixtures environmentally sustainable and compatible with the current experimental setup and operational environment. Among other gas mixtures, the one with helium and hydrofluoroolefin R1234ze gave the best result during the preliminary tests performed with two of the network telescopes. The detector has proved to reach performance levels comparable to those obtained with previous mixtures, without any modification of the hardware. We will discuss the first results obtained with the new mixture, tested with different percentages of the two components.
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