Abstract
Abstract. The cosmic ray muon tomography gives an access to the density structure of geological targets. In the present article we describe a muon telescope adapted to harsh environmental conditions. In particular the design optimizes the total weight and power consumption to ease the deployment and increase the autonomy of the detector. The muon telescopes consist of at least two scintillator detection matrices readout by photosensors via optical fibres. Two photosensor options have been studied. The baseline option foresees one multianode photomultiplier (MAPM) per matrix. A second option using one multipixel photon counter (MPPC) per bar is under development. The readout electronics and data acquisition system developed for both options are detailed. We present a first data set acquired in open-sky conditions compared with the muon flux detected across geological objects.
Highlights
The abundance and the large energy range of the atmospheric muons (Gaisser and Stanev, 2008), combined with the fact that the muons interact only weakly with matter, make them an appropriate probe for attempting tomographies of kilometer scale geological objects (Barrett et al, 1952)
The trigger scheme is based on a dual level architecture: Level 0 (L0) applied on the individual plane sensors and Level 1 (L1) applied online by the data acquisition (DAQ) mini-PC to the telescope data collected from all planes
In this article we detail the design, commissioning and running of scintillator telescopes dedicated to muon tomography of large geological structures such as volcanoes
Summary
Discuss.: 19 December 2011 Revised: 22 March 2012 – Accepted: 4 April 2012 – Published: 20 April 2012
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