The CMS RPC muon detector utilizes a gas recirculation system called closed loop (CL) to cope with large gas mixture volumes and costs. A systematic study of CL gas purifiers has been carried out over 400 days between July 2008 and August 2009 at CERN in a low-radiation test area, with the use of RPC chambers with currents monitoring, and gas analysis sampling points. The study aimed to fully clarify the presence of pollutants, the chemistry of purifiers used in the CL, and the regeneration procedure. Preliminary results on contaminants release and purifier characterization are reported.
@article{arxiv.1012.5511,
title = {Study of gas purifiers for the CMS RPC detector},
author = {L. Benussi and S. Bianco and S. Colafranceschi and F. L. Fabbri and F. Felli and M. Ferrini and M. Giardoni and T. Greci and A. Paolozzi and L. Passamonti and D. Piccolo and D. Pierluigi and A. Russo and G. Saviano and S. Buontempo and A. Cimmino and M. de Gruttola and F Fabozzi d A. O. M. Iorio and L. Lista and P. Paolucci and P. Baesso and G. Belli and D. Pagano and S. P. Ratti and A. Vicini and P. Vitulo and C. Viviani and R. Guida and A. Sharma},
journal= {arXiv preprint arXiv:1012.5511},
year = {2015}
}