Abstract
The Multi-Blade is a Boron-10-based neutron detector designed for neutron reflectometers and developed for the two instruments (Estia and FREIA) planned for the European Spallation Source in Sweden. A demonstrator has been installed at the AMOR reflectometer at the Paul Scherrer Institut (PSI—Switzerland). AMOR exploits the Selene guide concept and can be considered a scaled-down demonstrator of Estia. The results of these tests are discussed. It will be shown how the characteristics of the Multi-Blade detector are features that allow the focusing reflectometry operation mode. Additionally the performance of the Multi-Blade, in terms of rate capability, exceeds current state-of-the-art technology. The improvements with respect to the previous prototypes are also highlighted; from background considerations to the linear and angular uniformity response of the detector.
Highlights
: The Multi-Blade is a Boron-10-based neutron detector designed for neutron reflectometers and developed for the two instruments (Estia and FREIA) planned for the European Spallation
Due to the modular design of the Multi-Blade a high mechanical precision is required in order to minimize differences between the units, which leads to intrinsic dis-uniformities
One of the most appealing techniques is proposed by Estia [10], a forthcoming reflectometer at ESS, which will exploit the focusing reflectometry technique to push forward the investigations held with such neutron scattering technique outside the core science case, enabling the possibility of better measurements
Summary
The Multi-Blade is a modular detector made up of several units, here called cassettes. The cassettes are arranged over a circle around the sample position, so that each 10B4C layer is inclined at an angle (β in figure 1) of 5◦ with the incoming neutron direction This has the effect of improving the detection efficiency [6, 32] besides the spatial resolution across the wires and the counting rate capability. There are two thresholds applied to the data, one in the hardware, to allow the digitizers trigger and record an event on a single channel, and one in software. The latter is applied to the energy of a cluster to reject background, e.g. gamma-rays; and, as it will be shown, to compensate the wire to wire gain variation due to the detector geometry. When (T) has to be translated to neutron wavelength (λ), the physical depth (Z along the neutron incoming direction) of each wire must be taken into account [3]
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