Advances in neutron spin manipulation Roger Pynn, Indiana University, DMR 0956741

1. Advances in neutron spin manipulationRoger Pynn, Indiana University, DMR 0956741 • Using the polarized-neutron beam-line at the Low Energy Neutron Source (LENS) at Indiana University, we have demonstrated the suitability of a large-area, 340-nm-thick YBCO film on sapphire for use in a cryogenic neutron spin flipper. • This device is presently being combined with neutron spin rotation devices based on designs from the ILL to make a versatile neutron spin flipper. The image shows the YBCO film installed on a cold-head prior to installation on the beam line.

2. Expanding awareness of neutron spinRoger Pynn, Indiana University, DMR 0956741 • The project now employs two graduate students and one post-doctoral fellow, who are working in a group of four research and teaching faculty, some dozen students and 5 post-docs concentrating on neutron scattering. • We have held collaboration meetings with the major neutron scattering facilities in this country to identify their needs in neutron spin manipulation. • We are developing technical and research collaborations with the ILL and SNS to develop a spherical neutron polarimiter and RF spin manipulation devices for spallation neutron sources. • As part of the Center for the Exploration of Energy and Matter (CEEM) at IU, we regularly introduce the public to concepts associated with neutron scattering, such as the use of neutron spin. Project-supported students Radian Wang and Fankang Li inspect a field-step current sheet of their making as they install it for tests on the SESAME beam line at LENS. CEEM graduate student Rana Ashkar describes neutron polarization to a group of High School students using analogies with light in April 2010.