Neutron sensitive beam loss monitoring system for the European Spallation Source linac

Kittelmann, Irena Dolenc; Alves, Francisco; Bergman, Edvard; Derrez, Clement; Grishin, V.; Rosengren, Kaj; Shea, Thomas; Legou, P.; Mariette, Yannick; Nadot, Victor; Papaevangelou, T.; Cichalewski, W.; Jablonski, Grzegorz; Jałmużna, Wojciech; Kiełbik, Rafał

doi:10.1103/physrevaccelbeams.25.022802

Cited by 4 publications

(10 citation statements)

References 9 publications

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“…Data were acquired in parallel with the final ESS nBLM system acquisition, based on the IOxOS IFC_1410 AMC equipped with one IOxOS ADC_3111 FMC board, to validate the performances of the acquisition system. The results are presented in [6], demonstrating the good performance of the actual nBLM acquisition system, which is based on the on-line neutron counting algorithm. Temporal distribution of all events detected in the fast nBLM placed at LINAC4 (black).…”

Section: Jinst 18 P01013 4 Beam Loss Detection At Linac4mentioning

confidence: 90%

“…The signal amplified in the FEE is then transmitted to the DAQ system in the gallery. More details about the DAQ system used for the ESS-nBLM system can be found in [6,26,27].…”

Section: Jinst 18 P01013mentioning

confidence: 99%

“…Such a detector design is the aim of this work. A first effort was initially developed at SNS, where a detector consisting in a plastic scintillator with 6 Li converter, coupled to a PMT was tested for the first time in 2013.…”

Section: Introductionmentioning

confidence: 99%

“…The detector operation is based on the registration and counting of individual neutrons to enlarge its sensitivity with respect to detectors operating in current mode. Developed in the context of an in-kind contribution from CEA-Saclay to the European Spallation Source (ESS), it constitutes one of the ESS Beam Diagnostic (ESS BD) systems, namely the neutron sensitive BLM (ESS nBLM) system [6]. It will also be part of the Soreq accelerator [7].…”

Section: Introductionmentioning

confidence: 99%

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Detector design and performance tests of the ESS-neutron Beam Loss Monitor detectors

et al. 2023

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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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Section: Jinst 18 P01013 4 Beam Loss Detection At Linac4mentioning

confidence: 90%

“…The signal amplified in the FEE is then transmitted to the DAQ system in the gallery. More details about the DAQ system used for the ESS-nBLM system can be found in [6,26,27].…”

Section: Jinst 18 P01013mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detector design and performance tests of the ESS-neutron Beam Loss Monitor detectors

et al. 2023

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“…Detectors have been designed to be sensitive to neutrons while having a very low efficiency to gammas and x-rays. The proposed nBLM detectors are based on Micromegas (Micro-MEsh Gaseous Structure) technology [26], recently used also in ESS [27]. • Micro Beam Loss Monitors (𝜇BLM): Undesired micro beam losses, apart from decreasing the beam current, lead to activation of the pipe walls complicating maintenance as well as increasing the risk of SRF quenches due to heat deposition.…”

Section: Beam Loss Monitoringmentioning

confidence: 99%