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Detector design and performance tests of the ESS-neutron Beam Loss Monitor detectors
A new type of beam loss monitor has been developed based on the detection of fast neutrons produced by beam losses in hadron linear accelerators. This neutron sensitive Beam Loss Monitor (nBLM) has been concieved to fulfil the requirements of the European Spallation Source (ESS) and it will be p...
Autores principales: | , , , , , , , , , , , , , , |
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Lenguaje: | eng |
Publicado: |
2023
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1088/1748-0221/18/01/P01013 http://cds.cern.ch/record/2847607 |
Sumario: | A new type of beam loss monitor has been developed based on
the detection of fast neutrons produced by beam losses in hadron
linear accelerators. This neutron sensitive Beam Loss Monitor (nBLM)
has been concieved to fulfil the requirements of the European
Spallation Source (ESS) and it will be part of the ESS neutron
sensitive BLM system (ESS-nBLM). It has been specifically designed
for the low energy part, where only neutrons and gammas produced by
the loss can exit the accelerator vessel. Here other types of BLM,
based on charged particle detection, suffer from the lack of signal
compared to the photon background induced by the radio-frequency
cavities. However, it can also be operated in regions of higher
energy. The detector is of the Micromegas type and have been
designed at IRFU to be able to detect fast neutrons while having a
small sensitivity to gammas and thermal neutrons. In this work we
focus on the proof of neutron-to-gamma rejection and the first
operation of the detector in real beam conditions during the
commissioning of LINAC4 (CERN). Controlled beam losses were provoked
and have been detected by the nBLM detector installed, demonstrating
also the discrimination of the neutron signal from RF x-ray
background. |
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