Magnetic systems for wide-aperture neutron polarizers and analyzers

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• 作者：A.G. Gilev^a ; N.K. Pleshanov^a ; ^{pnk@pnpi.spb.ru" class="auth_mail" title="E-mail the corresponding author} ; B.A. Bazarov^a ; A.P. Bulkin^a ; A.F. Schebetov^a ; V.G. Syromyatnikov^a ; ^b ; V.V. Tarnavich^a ; V.A. Ulyanov^a
• 关键词：Neutron polarizer ; Neutron analyzer ; Polarizing efficiency ; Spin flip reflectivity ; Magnetic systems for neutron polarizers
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 October 2016
• 年：2016
• 卷：833
• 期：Complete
• 页码：233-238
• 全文大小：1743 K

文摘

Requirements on the field uniformity in neutron polarizers are analyzed in view of the fact that neutron polarizing coatings have been improved during the past decade. The design of magnetic systems that meet new requirements is optimized by numerical simulations. Magnetic systems for wide-aperture multichannel polarizers and analyzers are represented, including (a) the polarizer to be built at channel 4-4′ of the reactor PIK (Gatchina, Russia) for high-flux experiments with a 100×150 mm² beam of polarized cold neutrons; (b) the fan analyzer covering a 150×100 mm² window of the detector at the Magnetism Reflectometer (SNS, ORNL, USA); (c) the polarizer and (d) the fan analyzer covering a 220×110 mm² window of the detector at the reflectometer NERO, which is transferred to PNPI (Russia) from HZG (Germany). Deviations of the field from the vertical did not exceed 2°. The polarizing efficiency of the analyzer at the Magnetism Reflectometer reached 99%, a record level for wide-aperture supermirror analyzers.