A new type of wide-angle supermirror analyzer of neutron polarization

International Workshop on Neutron Optics and Detectors

Syromyatnikov, V.G.^1,2 ; Ulyanov, V.A.^1 ; Lauter, V.^3 ; Pusenkov, V.M.^1 ; Ambaye, H.^3 ; Goyette, R.^3 ; Hoffmann, M.^3 ; Bulkin, A.P.^1 ; Kuznetsov, I.N.^1 ; Medvedev, E.N.^1

Neutron Research Department, Petersburg Nuclear Physics Institute, Orlova Roscha, Gatchina, St.-Petersburg, 188300, Russia^1

Physics Department, St. Petersburg State University, Ulyanovskaya 1, Petrodvorets, St.-Petersburg, 198504, Russia^2

Neutron Sciences Directorate, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, United States^3

关键词: Beam cross section;    Channel widths;    Multi-channel analyzer;    Neutron polarization;    Neutron transmission;    Oak ridge National Laboratory;    Supermirrors;    Wide angle;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012021/pdf
DOI  :  10.1088/1742-6596/528/1/012021

来源: IOP

【 摘 要 】

We describe here a new type of wide-angle supermirror-based multichannel analyzer configured in the fan orientation. The increased channel width allows for reflections only from one of the channels walls, so that the overlap of beams propagating through neighboring channels is avoided. However the straight beam, which is unavoidably propagating through the channels with the increased width, is blocked by an absorbing mask at the entrance of the analyzer. The neutron transmission of such analyzer is 22% higher and the number of the supermirrors needed to cover the same beam cross section is 16% less in comparison with a conventional fan analyzer. Results of the calculations and first tests of the analyzer at the Magnetism Reflectometer at Oak Ridge National Laboratory, USA, are presented.