POLI-HEiDi: The new polarised neutron diffractometer at the hot source (SR9) at the FRM II—Project status

• DOI: 10.1016/j.physb.2009.06.049
• Publication Date: 2009-06-13T09:13:32Z
• Authors: V. Huţanu; M. Meven; E. Lelièvre-Berna; G. Heger
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract The project to upgrade the existing single-crystal diffractometer H eisses Ei nkristal Di ffractometer (HEiDi) at FRM II with a polarised neutron option, enabling the investigation of magnetic ground states in single crystals has been ongoing since autumn 2004. After a detailed investigation of the possible options it has been decided to develop and rebuild the secondary spectrometer and keep the HEiDi monocromator. The new instrument has been named POLI-HEiDi as an abbreviation of Pol arisation I nvestigator at HEiDi. Two different zero-field polarimeters will be made available for spherical neutron polarimetry, Cryoapad and MuPAD. Both, polarisation and analysis will be performed with polarised 3 He spin filters. Several new and important components of the instrument have recently been commissioned. In this report we present these components and show how they fit with the design of the whole instrument.