# VCI2022 - The 16th Vienna Conference on Instrumentation

Feb 21 – 25, 2022
Vienna University of Technology
Europe/Vienna timezone

## Operating the Resistive Plate Chambers with new eco-friendly gases

Feb 23, 2022, 2:25 PM
20m
Vienna University of Technology

#### Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Live Presentation Gaseous Detectors

### Speaker

Giorgia Proto (INFN e Universita Roma Tor Vergata (IT))

### Description

In this presentation we report the performance of the Resistive Plate Chambers (RPC) working with new eco-friendly gases which are intended to replace the traditional standard mixture($C_{2}H_{2}F_{4}/i-C_{4}H_{10}/SF_{6}$). The new gaseous components have Global Warming Potential (GWP) and Ozone Depletion Potential (ODP) both at very low or null level. Indeed the $C_{2}H_{2}F_{4}$ (GWP~1430) is replaced by a proper mixture of $CO_{2}$ and Tetrafluoropropene ($C_{3}H_{2}F_{4}$, GWP ~ 6) and the $SF_{6}$ (GWP ~ 23900) is replaced by a new molecule, the Chloro-Trifluoropropene ($C_{3}H_{2}ClF_{3}$, GWP ~ 5).
We present here, for several tested mixtures: detection efficiency, streamer probability, prompt and ionic charge as a function of the high voltage. Prompt and ionic charges are generated by electrons fast drift and ions slow drift motion respectively.
We also focus the attention on a new category of signals having intermediate properties between avalanche and streamer. This category is negligible for the standard gas mixture but relevant for HFO based gas mixtures.
The timing properties are studied and the detector time resolution is measured.
A direct comparison between $SF_{6}$ and $C_{3}H_{2}ClF_{3}$ is performed to study in depth the possibility to replace an industrially very important molecule like $SF_{6}$ .

### Primary authors

Giorgia Proto (INFN e Universita Roma Tor Vergata (IT)) Rinaldo Santonico (INFN e Universita Roma Tor Vergata (IT)) Barbara Liberti (INFN e Universita Roma Tor Vergata (IT))