A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity

Abstract : Superconductive accelerators may emit X-rays and Gammas mainly due to high electric fields applied on the superconductive cavity surfaces. Indeed, electron emissions will generate photons when electrons impinge on some material. Their energies depend on electron energies, which can be strongly increased by the cavity radio frequency power when it is phase-correlated with the electrons. Such photons present a real problem for Beam Loss Monitor (BLM) systems since no discrimination can be made between cavity contributions and beam loss contributions. Therefore, a new BLM is proposed which is based on gaseous Micromegas detectors, highly sensitive to fast neutrons, not to thermal ones and mostly insensitive to X-rays and Gammas. This detector uses Polyethylene for neutron moderation and the detection is achieved using a 10B or 10B4C converter film with a Micromegas gaseous amplification. Simulations show that detection efficiencies > 8 % are achievable for neutrons with energies between 1 eV and 10 MeV.
Type de document :
Communication dans un congrès
International Beam Instrumentation Conference, Sep 2016, Barcelona, Spain. pp.TUAL02, 2017, 〈10.18429/JACoW-IBIC2016-TUAL02〉
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01669652
Contributeur : Inspire Hep <>
Soumis le : mercredi 20 décembre 2017 - 23:50:44
Dernière modification le : mardi 25 septembre 2018 - 22:36:17

Identifiants

Citation

Jacques Marroncle, Alain Delbart, Daniel Desforge, Caroline Lahonde-Hamdoun, Philippe Legou, et al.. A New Beam Loss Monitor Concept Based on Fast Neutron Detection and Very Low Photon Sensitivity. International Beam Instrumentation Conference, Sep 2016, Barcelona, Spain. pp.TUAL02, 2017, 〈10.18429/JACoW-IBIC2016-TUAL02〉. 〈hal-01669652〉

Partager

Métriques

Consultations de la notice

39