CERN Accelerating science

Article
Report number	arXiv:1201.2640
Title	A Combined On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyzer for The ATLAS Silicon Tracker
Related title	A Combine On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyzer for The ATLAS Silicon Tracker
Author(s)	Bitadze, A. (Glasgow U.) ; Bates, R. (Glasgow U.) ; Battistin, M. (CERN) ; Berry, S. (CERN) ; Bonneau, P. (CERN) ; Botelho-Direito, J. (CERN) ; DiGirolamo, B. (CERN) ; Godlewski, J. (CERN) ; Perez-Rodriguez, E. (CERN) ; Zwalinski, L. (CERN) ; Bousson, N. (Marseille, CPPM) ; Hallewell, G. (Marseille, CPPM) ; Mathieu, M. (Marseille, CPPM) ; Rozanov, A. (Marseille, CPPM) ; Boyd, G. (Oklahoma U.) ; Doubek, M. (CTU, Prague) ; Vacek, V. (CTU, Prague) ; Vitek, M. (CTU, Prague) ; Egorov, K. (Indiana U.) ; Katunin, S. (St. Petersburg, INP) ; McMahon, S. (Rutherford) ; Nagai, K. (Tsukuba U., GSPAS)
Publication	2011
Imprint	13 Jan 2012
Number of pages	6
In:	Conf. Proc. C111010 (2011) pp.WEPMN038
In:	13th International Conference on Accelerator and Large Experimental Physics Control Systems, Grenoble, France, 10 - 14 Oct 2011, pp.969-972
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	An upgrade to the ATLAS silicon tracker cooling control system may require a change from C3F8 (octafluoro-propane) to a blend containing 10-30% of C2F6 (hexafluoro-ethane) to reduce the evaporation temperature and better protect the silicon from cumulative radiation damage with increasing LHC luminosity. Central to this upgrade is a new acoustic instrument for the real-time measurement of the C3F8/C2F6 mixture ratio and flow. The instrument and its Supervisory, Control and Data Acquisition (SCADA) software are described in this paper. The instrument has demonstrated a resolution of 3.10-3 for C3F8/C2F6 mixtures with  20%C2F6, and flow resolution of 2% of full scale for mass flows up to 30gs-1. In mixtures of widely-differing molecular weight (mw), higher mixture precision is possible: a sensitivity of < 5.10-4 to leaks of C3F8 into the ATLAS pixel detector nitrogen envelope (mw difference 160) has been seen. The instrument has many potential applications, including the analysis of mixtures of hydrocarbons, vapours for semi-conductor manufacture and anaesthesia.
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