Towards low gas consumption of muographic tracking detectors in field applications
arXiv:2105.09577 · doi:10.1063/5.0053984
Abstract
Gaseous detectors are widely used in high energy physics, and are attractive choices in tracking systems for cosmic muon imaging, also called muography. Such detectors offer high resolution and high efficiency at reasonable cost for large sizes, however, one of the drawbacks is that the gaseous detection medium must be prevented from contamination by outside air or internal outgassing. Standard systems work with a constant gas flow, leading to regular maintenance in the form of gas cylinder changes, which can be an issue for remote field applications. In this paper we discuss the practical possibilities to reduce gas consumption of an outdoor gaseous tracker, where particularly the gas density change from daily temperature cycling limits the input flow. Such "breathing" effect can be circumvented by well designed buffer volume, which must prevent external air contamination. A realistic MWPC tracking test system with 0.9 square meter area, total volume of 160 l, has been operated for 36 days with a flow of 3 l/day, confirming that the buffer volume, in this case a 50 m long and 10 l volume low diffusion tube, ensures sufficient gas quality. The key effects governing the gas flow dynamics, including diffusion and gas volume change, has been studied quantitatively, leading to practical design prescriptions.
arXiv comment20 pages, 12 figures. The following article has been submitted to Journal of Applied Physics under Manuscript #JAP21-AR-01969
References in corpus (7)
- Discovery of a big void in Khufu's Pyramid by observation of cosmic-ray muons
- Three-dimensional density structure of La Soufrieère de Guadeloupe lava dome from simultaneous muon radiographies and gravity data
- The application of muon tomography to the imaging of railway tunnels
- The MEV project: design and testing of a new high-resolution telescope for Muography of Etna Volcano
- Towards Sealed Resistive Plate Chambers
- A portable muon telescope based on small and gas-tight Resistive Plate Chambers
- RPC application in muography and specific developments