Polarization analysis on the LET cold neutron spectrometer using a 3He spin-filter: first results

We report on the design and construction of a neutron polarization analyzer based on a 3He spin filter for the LET spectrometer at the ISIS facility. Its commissioning completes the uniaxial polarized mode of the instrument. Besides the 3He spin filter cell, the analyzer consists of a set of electromagnetic coils to provide a uniform magnetic field, and a collimator to eliminate background from the sample environment and analyzer infrastructure. The 3He cell is separated from the LET main tank vacuum by means of a gas tank, which permits rapid cell changeovers and guarantees safe operation. In addition to the analyzer hardware, software has been written to reduce and correct polarized data. The successful operation of the polarized mode was realized for the separation of coherent and incoherent dynamics in an organic solar cell polymer blend.

[1]  R. Dalgliesh,et al.  Polarisation analysis on the LET time-of-flight spectrometer , 2017 .

[2]  F. Cacialli,et al.  Neutron polarisation analysis of Polymer: Fullerene blends for organic photovoltaics , 2016 .

[3]  F. Cacialli,et al.  Tuning Fullerene Intercalation in a Poly (thiophene) derivative by Controlling the Polymer Degree of Self-Organisation , 2016, Scientific Reports.

[4]  Thomas R. Gentile,et al.  Recent advancements of wide-angle polarization analysis with 3He neutron spin filters , 2016 .

[5]  J. Nelson,et al.  Temperature-Dependent Dynamics of Polyalkylthiophene Conjugated Polymers: A Combined Neutron Scattering and Simulation Study , 2015 .

[6]  E. Mamontov,et al.  Monitoring the dynamics of miscible P3HT:PCBM blends: A quasi elastic neutron scattering study of organic photovoltaic active layers , 2015 .

[7]  Thomas Brückel,et al.  Polarization analysis for the thermal chopper spectrometer TOPAS , 2015 .

[8]  K. Perez.  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2014 .

[9]  F. Cacialli,et al.  Structural and dynamical characterization of P3HT/PCBM blends , 2013 .

[10]  J. Stewart,et al.  3He polarization for ISIS TS2 phase I instruments , 2011 .

[11]  Robert Bewley,et al.  LET, a cold neutron multi-disk chopper spectrometer at ISIS , 2011 .

[12]  F. Mezei,et al.  First implementation of Repetition Rate Multiplication in neutron spectroscopy , 2009 .

[13]  A. Wildes.  Scientific Reviews: Neutron Polarization Analysis Corrections Made Easy , 2006 .

[14]  A. Deninger,et al.  Paramagnetic relaxation of spin polarized 3He at coated glass walls , 2006 .

[15]  E. Farhi,et al.  Component Manual for the Neutron Ray-Tracing Package McStas, Version 1.12 , 2006 .

[16]  Kim Lefmann,et al.  McStas 1.7 - a new version of the flexible Monte Carlo neutron scattering package , 2004 .