Long term experience with perfluorobutane in COMPASS RICH
Abstract
COMPASS RICH-1 has used high-purity perfluorobutane as radiator gas since 2001. The operation and control of the radiator gas has evolved over years with continuous improvements. We report on the experience gained in the 20 year-long operation of perfluorobutane as COMPASS RICH radiator. Very accurate values for the radiator gas refractive index are needed for high-performance particle identification. The procedure has evolved over years and the one presently in use, which provides refractive index estimate at the 1 ppm level, is discussed. Perfluorobutane procurement is becoming challenging, and the minimization of material waste is now a priority for the protection of the environment. Commercially available perfluorobutane needs dedicated filtering before usage and typical material losses in the filtering procedure were around 30%. Recent efforts allowed us to reduce them to about 5%. A potential alternative to fluorocarbon radiators in gaseous RICHes is also presented.
Cite
@article{arxiv.2308.01658,
title = {Long term experience with perfluorobutane in COMPASS RICH},
author = {F. Bradamante and A. Bressan and A. Cicuttin and M. L. Crespo and C. Chatterjee and P. Ciliberti and S. Dalla Torre and W. Florian and L. Garcia Ordonez and M. Gregori and A. Kerbizi and S. Levorato and A. Martin and G. Menon and R. S. Molina and A. Moretti and F. Tessarotto and Triloki and B. Valinoti},
journal= {arXiv preprint arXiv:2308.01658},
year = {2023}
}
Comments
4 pages, 3 figures 2 tables