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Instrumental design and expected performance of coupled-moderator near-backscattering spectrometer at J-PARC |
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| Authors: | N Takahashi K Shibata I Tamura S Harjo M Arai |
| Institution: | a J-PARC Centre, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan b Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan c Tokai Research and Development Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan d Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan e Hahn-Meitner-Institut, Glienicker str. 100, 14109 Berlin, Germany f Los Alamos National Laboratory, MS H805, Los Alamos, NM 87545, USA |
| Abstract: | A near-backscattering (n-BS) crystal-analyzer neutron inelastic spectrometer, DIANA, has been proposed for construction at Japan Proton Accelerator Research Complex. It has originally been designed to view a decoupled non-poisoned moderator in order to obtain high intensity and good energy resolution. Recently, we have reconsidered the instrumental parameters including the type of moderator, by performing Monte-Carlo simulations in order to obtain better performance. Among four virtual n-BS spectrometers on different beam sources moderators, a coupled-moderator-source spectrometer has shown the best performance, i.e. compared to the original DIADA design between ninefold and fivefold enhanced intensities have been obtained with 21%-better to 35%-worse energy resolutions. |
| Keywords: | C Neutron scattering |
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