Monday 07 April 2025
Scientists have made a significant breakthrough in developing more environmentally friendly gas mixtures for Resistive Plate Chambers (RPCs), a crucial component of particle accelerators like CERN’s Large Hadron Collider.
The standard gas mixture used in RPCs contains gases such as sulfur hexafluoride (SF6) and perfluoropropane (C2H2F4), which have high global warming potentials. However, these gases are not recommended for industrial use due to their contribution to climate change. As a result, researchers have been working on finding alternative gas mixtures that can achieve the same performance while being more environmentally friendly.
One approach has been to replace C2H2F4 with a mixture of trichlorofluoromethane (C3H2F4) and carbon dioxide (CO2). This new gas mixture, known as ECO3, has a significantly lower global warming potential than the standard mixture. The researchers tested the performance of RPCs using ECO3 and found that it achieved high detection efficiency and good timing performance.
However, one challenge with using CO2-based gas mixtures is that they have a lower density than C2H2F4, which can affect the detector’s ability to detect particles. To address this issue, the researchers added more C3H2F4 to the mixture, creating another blend called ECO65. This mixture achieved high detection efficiency and good timing performance, while also having a lower global warming potential than the standard mixture.
Another approach has been to add a small amount of CO2 to the standard gas mixture. This new mixture, known as 65%C2H2F4/30%CO2/4%i- C4H10/1%SF6, achieved good performance in terms of detection efficiency and current under irradiation.
The researchers are continuing to test these new gas mixtures and refine their composition to achieve the best possible performance while minimizing their environmental impact. The development of more environmentally friendly gas mixtures for RPCs is an important step towards reducing the carbon footprint of particle accelerators and contributing to a more sustainable future.
In the long term, the use of these alternative gas mixtures could also help to reduce the cost of operating and maintaining RPCs, as well as minimize their environmental impact. This breakthrough has the potential to benefit not only CERN’s Large Hadron Collider but also other particle accelerators around the world.
Cite this article: “Breathing New Life into Particle Detectors: Eco-Friendly Gas Mixtures for the ATLAS Experiment”, The Science Archive, 2025.
Gas Mixtures, Resistive Plate Chambers, Rpcs, Particle Accelerators, Cern, Large Hadron Collider, Environmental Impact, Global Warming Potential, Co2, Fluorinated Gases
