A Combined On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyser for the ATLAS Silicon Tracker - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Conference Papers Year : 2012

A Combined On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyser for the ATLAS Silicon Tracker

R. Bates
  • Function : Author
M. Battistin
  • Function : Author
S. Berry
  • Function : Author
P. Bonneau
  • Function : Author
J. Botelho-Direito
  • Function : Author
B. Digirolamo
  • Function : Author
J. Godlewski
  • Function : Author
E. Perez-Rodriguez
  • Function : Author
L. Zwalinski
  • Function : Author
G. Boyd
  • Function : Author
M. Doubek
  • Function : Author
V. Vacek
  • Function : Author
M. Vitek
  • Function : Author
K. Egorov
  • Function : Author
S. Katunin
  • Function : Author
S. Mcmahon
  • Function : Author
K. Nagai
  • Function : Author

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.

Dates and versions

in2p3-00741263 , version 1 (12-10-2012)

Identifiers

  • HAL Id : in2p3-00741263 , version 1
  • ARXIV : 1201.2640

Cite

R. Bates, M. Battistin, S. Berry, P. Bonneau, J. Botelho-Direito, et al.. A Combined On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyser for the ATLAS Silicon Tracker. 13th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPS 2011), Oct 2012, Grenoble, France. ⟨in2p3-00741263⟩
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