在EEE实验的MRPC阵列中减少环境影响的策略

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在EEE实验的MRPC阵列中减少环境影响的策略

Strategies to reduce the environmental impact in the MRPC array of the EEE experiment

论文作者

Panetta, M. P., Abbrescia, M., Avanzini, C., Baldini, L., Ferroli, R. Baldini, Batignani, G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Cicalò, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, D., De Pasquale, S., Fabbri, F., Falchieri, D., Galante, L., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Hatzifotiadou, D., La Rocca, P., Liu, Z., Lombardo, L., Mandaglio, G., Maron, G., Mazziotta, M. N., Mulliri, A., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Paoletti, R., Parvis, M., Pellegrino, C., Perasso, L., Pinazza, O., Pinto, C., Pisano, S., Riggi, F., Righini, G., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serri, G., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, C., Votano, L., Williams, M. C. S., Zichichi, A., Zuyeuski, R.

论文摘要

极端能源事件（EEE）项目采用多间隙电阻板室（MRPC）来研究大量空气淋浴中的次级宇宙射线μ子。阵列由大约60个跟踪探测器组成，在意大利领土和CERN上稀疏。 MRPC与基于$ C_2H_2F_4 $和$ SF_6 $的气体混合物一起流动，这两种都是氟化的温室气体，对气氛产生了很大的环境影响。由于欧盟施加的限制，这些气体被淘汰，其成本在很大程度上增加了。 EEE合作开始了一项运动，旨在减少其阵列的气体排放，目的是包含成本并降低实验全球变暖的影响。一种方法是降低每个EEE检测器中的气体速率。另一个是开发气体再循环系统，该系统的第一个原型已安装在位于CERN的EEE站之一。共同的一种并行策略的重点是寻找能够替代标准混合物而不会影响MRPC性能的环境友好的气体混合物。这里介绍了概述和第一个结果。

The Extreme Energy Events (EEE) Project employs Multi-gap Resistive Plate Chamber (MRPC) for studying the secondary cosmic ray muons in Extensive Air Showers. The array consists of about 60 tracking detectors, sparse on Italian territory and at CERN. The MRPCs are flowed with a gas mixture based on $C_2H_2F_4$ and $SF_6$, both of which are fluorinated greenhouse gases with a high environmental impact on the atmosphere. Due to the restrictions imposed by the European Union, these gases are being phased out of production and their cost is largely increasing. The EEE Collaboration started a campaign to reduce the gas emission from its array with the aim of containing costs and decreasing the experiment global warming impact. One method is to reduce the gas rate in each EEE detector. Another is to develop a gas recirculation system, whose a first prototype has been installed at one of the EEE stations located at CERN. Jointly a parallel strategy is focused on searching for environmental friendly gas mixtures which are able to substitute the standard mixture without affecting the MRPC performance. An overview and first results are presented here.

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