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In situ SEOP polarised He neutron spin filter for incident beam polarisation and polarisation analysis on neutron scattering instruments |
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| Authors: | S Boag E Babcock KH Andersen M Becker TR Charlton WC Chen RM Dalgliesh SD Elmore CD Frost TR Gentile R Lopez Anton SR Parnell AK Petoukhov MWA Skoda T Soldner |
| Institution: | a ISIS, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK b Institut Laue-langevin, 6 rue J. horowitz, BP 156, 38042, Grenoble Cedex 9, France c Jülich Centre for Neutron Science at FRM II, Lichtenbergstrae 1, 85747 Garching, Germany d National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA e ICMA, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain f Academic Unit of Radiology, University of Sheffield, S10 2JF, UK |
| Abstract: | We discuss the development and characterisation of a new in situ spin exchange optical pumping (SEOP) based 3He neutron spin filter polarisation device. We present results from a recent test of the prototype system developed with the Institut Laue-Langevin. The polariser was installed on the polarised reflectometer CRISP at ISIS in the analyser position. The 3He was pumped continuously in situ on the beamline. The system also integrated a 3He adiabatic fast passage spin flipper that allowed reversal of the 3He and therefore neutron polarisation state, allowing for measurement of all four polarisation cross-sections. The system was run for a number of days reaching a 3He polarisation of 63%. |
| Keywords: | Polarised neutrons Neutron spin filter In situ pumping |
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