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Title ESS nBLM: Beam Loss Monitors based on Fast Neutron Detection
  • T. Papaevangelou
    CEA/IRFU, Gif-sur-Yvette, France
  • H. Alves, S. Aune, J. Beltramelli, Q. Bertrand, T. Bey, B. Bolzon, N. Chauvin, M. Combet, D. Desforge, M. Desmons, Y. Gauthier, E. Giner-Demange, A. Gomes, F. Gougnaud, F. Harrault, F. J. Iguaz Gutierrez, T.J. Joannem, M. Kebbiri, C. Lahonde-Hamdoun, P. Le Bourlout, Ph. Legou, O. Maillard, A. Marcel, C. Marchand, Y. Mariette, J. Marroncle, V. Nadot, M. Oublaid, G. Perreu, O. Piquet, B. Pottin, Y. Sauce, J. Schwindling, L. Segui, F. Senée, R. Touzery, G. Tsiledakis, O. Tuske, D. Uriot
    IRFU, CEA, University Paris-Saclay, Gif-sur-Yvette, France
  • I. Dolenc Kittelmann, R.J. Hall-Wilton, C. Höglund, L. Robinson, T.J. Shea, P. Svensson
    ESS, Lund, Sweden
  • V. Gressier
    IRSN, Saint-Paul-Lez-Durance, France
  • K. Nikolopoulos
    Birmingham University, Birmingham, United Kingdom
  • M. Pomorski
    CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
Abstract A new type of Beam Loss Monitor (BLM) system is being developed for use in the European Spallation Source (ESS) linac, primarily aiming to cover the low energy part (proton energies between 3-100 MeV). In this region of the linac, typical BLM detectors based on charged particle detection (i.e. Ionization Cham-bers) are not appropriate because the expected particle fields will be dominated by neutrons and photons. Another issue is the photon background due to the RF cavities, which is mainly due to field emission from the electrons from the cavity walls, resulting in brems-strahlung photons. The idea for the ESS neutron sensi-tive BLM system (ESS nBLM) is to use Micromegas detectors specially designed to be sensitive to fast neutrons and insensitive to low energy photons (X and gammas). In addition, the detectors must be insensitive to thermal neutrons, because those neutrons may not be directly correlated to beam losses. The appropriate configuration of the Micromegas operating conditions will allow excellent timing, intrinsic photon back-ground suppression and individual neutron counting, extending thus the dynamic range to very low particle fluxes.
Paper download THA1WE04.PDF [1.090 MB / 6 pages]
Slides download THA1WE04_TALK.PDF [3.267 MB]
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Conference HB2018, Daejeon, Korea
Series ICFA Advanced Beam Dynamics Workshop (61st)
Proceedings Link to full HB2018 Proccedings
Session WG-E
Date 21-Jun-18   08:30–10:30
Main Classification Beam Instruments and Interactions
Keywords detector, neutron, linac, proton, photon
Publisher JACoW Publishing, Geneva, Switzerland
Editors Volker RW Schaa (GSI, Darmstadt, Germany)
ISBN 978-3-95450-202-8
Published July 2018
Copyright © 2018 by JACoW, Geneva, Switzerland     CC-BY Creative Commons License
cc Creative Commons Attribution 3.0