SANS polarization analysis at V4 SANS instrument of HMI Berlin
Measurement Science and Technology, ISSN: 1361-6501, Vol: 19, Issue: 3
2008
- 18Citations
- 15Captures
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Conference Paper Description
The V4 instrument has recently been upgraded with a He spin filter cell, placed directly in the homogeneous field B of the sample magnet, to enhance the SANSPOL option for polarization analysis. The prototype setup was still affected by: (a) a quick relaxation of the He nuclear polarization in the cell with a time constant of only ≈130 min which significantly changes the spin filter transmissions T and T for neutrons polarized parallel I and anti-parallel I to B, and (b) the absence of a flipping aid behind the sample. The usual polarization analysis procedure, expecting virtually time-independent transmissions and a second flipping device, is therefore not applicable. We present an alternative way of polarization analysis, developed especially for this case of a spin filter cell with insufficient time stability, and not requiring a second flipper. A concentrated Co-ferrofluid sample 'MFT3N' was measured with the spin filter cell for 5.5 h. From the time-dependent change of I and I caused by the change of T and T , the spin-flip and non-spin-flip components of the scattering were calculated by fitting procedures. The two-dimensional flip patterns obtained represent the purely magnetic scattering contribution, featuring the typical (sin αcos α) angular behavior expected for superparamagnetic systems. © 2008 IOP Publishing Ltd.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=38949202263&origin=inward; http://dx.doi.org/10.1088/0957-0233/19/3/034009; https://iopscience.iop.org/article/10.1088/0957-0233/19/3/034009; https://dx.doi.org/10.1088/0957-0233/19/3/034009; https://validate.perfdrive.com/9730847aceed30627ebd520e46ee70b2/?ssa=4633cc3e-ef58-4c5e-8b96-f96b3752b486&ssb=74420295536&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0957-0233%2F19%2F3%2F034009&ssi=ae034415-cnvj-4238-96dd-39317c937873&ssk=botmanager_support@radware.com&ssm=977736718163392445221092987800980497&ssn=366199949b8bf93be13e7c7db0d9f698f1d70900c3c4-8990-4f21-aef2f1&sso=18144f8c-bc564dd29deac78df202de67147808e7d7055e576a2a29a3&ssp=30314776921726577755172689851917326&ssq=69283173677627571154029239718746477045127&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJ1em14IjoiN2Y5MDAwMGMxZDc2YmItMzk2MS00N2VjLTlkZGItNjdmYTVhZTY2ODdlNS0xNzI2NTI5MjM5NDUzMzA3NTM2NzU3LTNjMmUwMmY2NmRkZDZjMGU1MjE5MzUiLCJfX3V6bWYiOiI3ZjYwMDBkNzYzNGE3Ni05ZTRkLTRjMmMtYjJhMC1mYzAzNGMyZjE1MjkxNzI2NTI5MjM5NDUzMzA3NTM2NzU3LTJhNDEzYTM5NzRmZTA3ODU1MjE5ODAiLCJyZCI6ImlvcC5vcmcifQ==
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