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Article

A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source

1
ESS-Bilbao, Parque Científico y Tecnológico Bizkaia Nave 201, 48170 Zamudio, Spain
2
Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
3
European Spallation Source ESS ERIC, P.O. Box 176, SE-22100 Lund, Sweden
*
Author to whom correspondence should be addressed.
Received: 4 December 2020 / Revised: 8 January 2021 / Accepted: 11 January 2021 / Published: 14 January 2021
(This article belongs to the Special Issue New Trends in Neutron Instrumentation)
The fixed-energy window scan approach, for both elastic and inelastic modes, is a valuable tool to discriminate between motions activated when dynamical phase transitions occur in a sample as a function of time, temperature, pressure, electrical field or illumination. Considering that, on one hand, such variations can generate a weak signal, and on the other, high data throughput makes it possible to screen many samples during a beam time, pulse multiplication is an ideal strategy to optimize the intensity of the analyzed signal. To ensure this capability, a proposal for a future upgrade of MIRACLES, the neutron time-of-flight backscattering spectrometer at the European Spallation Source (ESS) under construction in Lund, is reported in this article. The concept for a new chopper layout relies on the extraction of several elastic pulses, ensuring an increase in the neutron total elastic intensity hitting the sample. This proposal can be extended to the inelastic counterpart. The premise is to maintain the original beamline layout without modification, either of the guide sections or of the current chopper layout of MIRACLES, thereby guaranteeing that minimal changes and impact will occur during the proposed upgrade. However, this also presents a significant challenge, namely, to achieve an efficient pulse multiplication within the width and the length of the guide and within the rising/decay time of the pulses. With the concept presented here, an increase in elastic intensity by a factor of 2.8 was obtained. This is analogous to performing elastic fixed window (EFW) measurements with an ESS source operating at 14 MW, widening considerably the performance capabilities of MIRACLES. The knowledge generated here is also valuable for the design of scientific instruments for the next generation of low-energy, accelerator-driven neutron sources. View Full-Text
Keywords: neutron instrumentation; inelastic neutron scattering; fixed-energy window scan; neutron time of flight; pulse multiplication neutron instrumentation; inelastic neutron scattering; fixed-energy window scan; neutron time of flight; pulse multiplication
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MDPI and ACS Style

Villacorta, F.J.; Bordallo, H.N.; Arai, M. A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source. Quantum Beam Sci. 2021, 5, 2. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs5010002

AMA Style

Villacorta FJ, Bordallo HN, Arai M. A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source. Quantum Beam Science. 2021; 5(1):2. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs5010002

Chicago/Turabian Style

Villacorta, Félix J., Heloisa N. Bordallo, and Masatoshi Arai. 2021. "A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source" Quantum Beam Science 5, no. 1: 2. https://0-doi-org.brum.beds.ac.uk/10.3390/qubs5010002

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