Dynamic nuclear polarization apparatus for contrast variation neutron scattering experiments on iMATERIA spectrometer at J-PARC
Abstract
We have introduced a 7 T dynamic nuclear polarization apparatus for contrast variation neutron scattering experiments on iMATERIA spectrometer at the Materials and Life Science Facility at the J-PARC spallation neutron source. At 1.2 K and 6.7 T, we have achieved high proton spin polarizations (76%/ -84%) and short buildup time constants (3.2 min/4.1 min) for a polystyrene cast film doped with 50 mM 2,2,6,6-tetramethylpiperidine 4-oxy (TEMPO), after applying microwave frequency modulation. The instrument realizes easy sample exchange and significant contrast variation beyond what is available by deuterium substitution.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- April 2019
- DOI:
- 10.1016/j.nima.2019.01.051
- Bibcode:
- 2019NIMPA.923..127N
- Keywords:
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- Dynamic nuclear polarization;
- Neutron spectroscopy;
- Small angle neutron scattering;
- Contrast variation