SNS Ring and RTBT Beam Current Monitor

Blokland, W.; Armstrong, G.A.; Deibele, C.; Pogge, J.; Gaidash, V. A.

doi:10.1063/1.2401410

Cited by 6 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the results agree well with the 10 μs limit for the SC parts of the linac. Though experience at SNS raises a question for this limit, since there a degradation of the superconducting cavities is observed already after losing 15 s m < pulse of a 26 mA beam about 10 times per day [62].…”

Section: Beam Loss Monitoring (Blm)mentioning

confidence: 99%

The European Spallation Source Design

et al. 2017

View full text Add to dashboard Cite

The ESS Design: Accelerator 6The ESS Design: Target 66The ESS Design: Controls 93The ESS Design: Conventional Facilities 109Physica ScriptaPhys. Scr. 93 (2018) 014001 (121pp) https://doi.org/10. 1088/1402-4896/aa9bff This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Content from this work may be used under the terms of the Creative Commons Attribution-NonCommercialNoDerivs 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Neutron scattering is a well-developed and extensively used means to get access to fundamental properties of biological matter as well as of physical materials. Until the end of the twentieth century that was mainly practiced with-and limited in performance by-the continuous flux of neutrons from ageing nuclear reactors (e.g. the Institut Laue-Langevin (ILL), the flagship of neutron research in Europe and in the world) [1]). Looking forward to the following two decades, an OECD report published in 1998 diagnosed the foreseeable decrease of the number of operational facilities [2] and the need to progress in performance. Considering the high scientific interest and the increasing importance of the subject for society at large, the report concluded by strongly recommending the construction of next generation neutron sources in America, Europe and Asia. Pulsed spallation neutron sources (SNS) using a proton beam power exceeding 1 MW were specifically mentioned as the most interesting high performance facilities in the future landscape of neutron laboratories.The USA was the first country to follow this advice by building the SNS in the Oak Ridge National Laboratory (ORNL) which started in 2006 [3, 4]. Japan followed in 2009 with the Japan Proton Accelerator Research Centre (J-PARC) in Tokai [5,6]. In Europe, the subject was part of a concerted effort to further develop the European world-leading largescale research infrastructures suite. In 2003, the European Strategy Forum for Research Infrastructures (ESFRI), set up by the Research Ministries of the Member States and associated countries, concluded that a 5 MW long-pulse, single target station layout with nominally 22 'public' instruments was the optimum technical reference design for an European Spallation Source (ESS) that would meet the needs of the European science community in the second quarter of the century [7].Six years later, in 2009, it materialised in a real project with the adoption of the site of Lund (Sweden). A preconstruction phase followed until the end of 2013 during which the design was finalised [8]. Construction then started with the first neutron beams planned to be available in 2019, and the ESS facility to be operational at full performance in 2025.2 Description 2.1 Principle and specifics. The high level parameters of ESS are shown in table 1. As at SNS and J-PARC, neutrons at ESS are produced by spallation, when the 2 GeV protons hit the meta...

show abstract

Section: Beam Loss Monitoring (Blm)mentioning

confidence: 99%

The European Spallation Source Design

et al. 2017

View full text Add to dashboard Cite

show abstract

“…SNS accelerator employs a DCM [41,42] to protect the super conducting linac (SCL) from adverse effects of beam losses [43]. Figure 1 shows a schematic diagram of the DCM.…”

Section: Data Source and Collectionmentioning

confidence: 99%

Robust errant beam prognostics with conditional modeling for particle accelerators

Rajput,

Schram,

Blokland

et al. 2024

Mach. Learn.: Sci. Technol.

View full text Add to dashboard Cite

Particle accelerators are complex and comprise thousands of components, with many pieces of equipment running at their peak power. Consequently, they can fault and abort operations for numerous reasons, lowering efficiency and science output. To avoid these faults, we apply anomaly detection techniques to predict unusual behavior and perform preemptive actions to improve the total availability. Supervised Machine Learning (ML) techniques such as Siamese Neural Network (SNN) models can outperform the often-used unsupervised or semi-supervised approaches for anomaly detection by leveraging the label information. One of the challenges specific to anomaly detection for particle accelerators is the data’s variability due to accelerator configuration changes within a production run of several months. ML models fail at providing accurate predictions when data changes due to changes in the configuration. To address this challenge, we include the configuration settings into our models and training to improve the results. Beam configurations are used as a conditional input for the model to learn any cross-correlation between the data from different conditions and retain its performance. We employ Conditional Siamese Neural Network (CSNN) models and Conditional Variational Auto Encoder (CVAE) models to predict errant beam pulses at the Spallation Neutron Source (SNS) under different system configurations and compare their performance. We demonstrate that CSNNs outperform CVAEs in our application.

show abstract

“…A novel instrument to measure and monitor the ESS beam on Target properties focuses on its footprint outside the allowed aperture: the APerTure Monitor (APTM). This type of beam diagnostics is in use in similar designs at J-PARC [2] and SNS [3]. The current design benefits from these designs and combines the technologies to the applied case of ESS beam on target instrumentation.…”

Section: Introduction and Instrument Principlementioning

confidence: 99%

Proton Beam APerture MoniTor instrument design and overview for the Commissioning and Operation of ESS High Power Beam on Target

Donegani,

Kočevar,

Olsson

et al. 2024

J. Inst.

View full text Add to dashboard Cite

This paper presents a detector developed to protect the ESS spallation target. The detector is installed to receive a proton beam that has a peak current of 62.5 mA, an average power of 5 MW, and energy up to 2 GeV. It is designed to detect any part of the proton beam that goes outside a defined aperture, which is deemed as an errant beam condition. This detector is mainly used for machine protection. The detector works based on two physical processes. The first process is the generation of current in metallic blades, which is proportional to the intercepting beam. The second process is heat load from the beam energy deposition in interacting thermocouples. The combination of these two signals allows the detection of events ranging from microseconds to several minutes. This paper also presents the design of the instrument, its efficiency, and its range of operation.

show abstract

SNS Ring and RTBT Beam Current Monitor

Cited by 6 publications

References 0 publications

The European Spallation Source Design

The European Spallation Source Design

Robust errant beam prognostics with conditional modeling for particle accelerators

Proton Beam APerture MoniTor instrument design and overview for the Commissioning and Operation of ESS High Power Beam on Target

Contact Info

Product

Resources

About