Medipix3RX neutron camera for ambient radiation measurements in the CMS cavern

Srinidhi Bheesette, Arkady Lokhovitskiy, Sophie Mallows, Michael F. Walsh, Robert M.N. Doesburg, Stephen T. Bell, Anne Dabrowski, Anthony P.H. Butler, Philip H. Butler, Sikiru A. Adebileje, Steven D. Alexander, Maya R. Amma, Marzieh Anjomrouz, Fatemeh Asghariomabad, Ali Atharifard, Kenzie Baer, Benjamin Bamford, Pierre Carbonez, Claire Chambers, Alexander I. ChernoglazovShishir Dahal, Tara Dalefield, Jérôme Damet, Niels J.A. De Ruiter, Neryda Duncan, Steven P. Gieseg, Brian P. Goulter, Sam Gurney, Joseph L. Healy, Peter J. Hilton, Preveenkumar Kanithi, Tracy Kirkbride, Stuart P. Lansley, Chiara Lowe, V. B.H. Mandalika, Emmanuel Marfo, Aysouda Matanaghi, Mahdieh Moghiseh, David Palmer, Raj K. Panta, Hannah M. Prebble, Aamir Y. Raja, Mohsen Ramyar, Peter Renaud, Nanette Schleich, Emily Searle, Muhammad Shamshad, Jereena S. Sheeja, Rayhan Uddin, Lieza Vanden Broeke, V. S. Vivek, E. Peter Walker, Manoj Wijesooriya, Tim B.F. Woodfield

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We describe a CMS-Medipix3RX neutron camera developed by adapting and modifying detector readout electronics developed at the University of Canterbury. The readout electronics are part of the MARS x-ray scanner used for imaging applications [1]. The neutron cameras will be used for the precise evaluation of complex radiation fields in and around the Compact Muon Solenoid (CMS) detector on the Large Hadron Collider (LHC) at CERN. This evaluation will help to ascertain the performance of various sub-systems installed in the cavern as well as to predict their useful lifetimes. Medipix3RX detector can deliver real-time images of the flux and spectral composition of different particles, including slow and fast neutrons. In this neutron camera, slow neutrons are detected using a lithium fluoride conversion layer and fast neutrons by a polypropylene layer. These produce charged particles, which are then detected by a semiconductor sensor material, silicon. We modelled the mixed-field radiation at seven Medipix detector locations in the cavern by scoring the particle travelling through the detector location using FOCUS, a Monte-Carlo simulation tool, analysing the energy as well as their angular distributions of neutrons from the result of simulations.A good agreement was observed between the average flux predicted by standard FLUKA methods and those obtained from FOCUS output data integrated over time. Also, the response function of the Medipix detectors was modelled and simulated for different thicknesses of the neutron conversion layer. An algorithm was developed for track reconstruction and recognition using cluster analysis techniques. This labels and determines the density of clusters formed by groups of particles. The CMS-Medipix detectors with their conversion layers were calibrated in the CERN neutron facility and installed in the CMS cavern at the beginning of 2018. This paper discusses the calibration of the detector installation and presents early results of radiation measurements from 2018 run.

Original languageBritish English
Title of host publication2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538684948
DOIs
StatePublished - Nov 2018
Event2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Sydney, Australia
Duration: 10 Nov 201817 Nov 2018

Publication series

Name2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings

Conference

Conference2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018
Country/TerritoryAustralia
CitySydney
Period10/11/1817/11/18

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