Abstract
We have a plan to install Drabkin energy filters for neutron spectrometers at the Japanese Spallation Neutron Source (JSNS) project. Combined with a high-intensity coupled moderator, a Drabkin energy filter could be very useful to obtain a high-resolution polarized beam with higher intensity than a beam from a decoupled moderator. Hence, it could bring about a breakthrough for more efficient use of neutrons at neutron spectrometers. We have developed a Drabkin energy filter which has 10 periods of spatially oscillating magnetic field and measured spin–flip probabilities as functions of field strength and of neutron wavelength. In this paper, results of the performance tests of Drabkin energy filters are presented and discussed.
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