Compact spherical neutron polarimeter using high-Tc YBCO films

T. Wang; S. R. Parnell; W. A. Hamilton; F. Li; A. L. Washington; D. V. Baxter; R. Pynn

doi:10.1063/1.4943254

Compact spherical neutron polarimeter using high-T_c YBCO films

T. Wang, S. R. Parnell, W. A. Hamilton, F. Li, A. L. Washington, D. V. Baxter, R. Pynn

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We describe a simple, compact device for spherical neutron polarimetry measurements at small neutron scattering angles. The device consists of a sample chamber with very low (<0.01 G) magnetic field flanked by regions within which the neutron polarization can be manipulated in a controlled manner. This allows any selected initial and final polarization direction of the neutrons to be obtained. We have constructed a prototype device using high-T_c superconducting films and mu-metal to isolate regions with different magnetic fields and tested device performance in transmission geometry. Finite-element methods were used to simulate the device's field profile and these have been verified by experiment using a small solenoid as a test sample. Measurements are reported using both monochromatic and polychromatic neutron sources. The results show that the device is capable of extracting sample information and distinguishing small angular variations of the sample magnetic field. As a more realistic test, we present results on the characterization of a 10 μm thick Permalloy film in zero magnetic field, as well as its response to an external magnetic field.

Original language	English
Article number	033901
Journal	Review of Scientific Instruments
Volume	87
Issue number	3
DOIs	https://doi.org/10.1063/1.4943254
State	Published - Mar 2016
Externally published	Yes

Funding

The design and construction of the device were supported by the National Science Foundation through Grant No. DMR-0956741. Construction of LENS was supported by the National Science Foundation Grant Nos. DMR-0220560 and DMR-0320627, the 21st Century Science and Technology fund of Indiana, Indiana University, and the Department of Defence. Operations of LENS are supported by the Office of the Vice Provost for Research at Indiana University. Measurement time on the HB-2D beamline at the HFIR at Oak Ridge National Laboratory (ORNL) is managed by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.

Funders	Funder number
Office of the Vice Provost for Research at Indiana University
National Science Foundation	DMR-0220560, DMR-0320627, DMR-0956741
U.S. Department of Defense
U.S. Department of Energy
Oak Ridge National Laboratory
Indiana University
UT-Battelle	DE-AC05-00OR22725

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10.1063/1.4943254

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title = "Compact spherical neutron polarimeter using high-Tc YBCO films",

abstract = "We describe a simple, compact device for spherical neutron polarimetry measurements at small neutron scattering angles. The device consists of a sample chamber with very low (<0.01 G) magnetic field flanked by regions within which the neutron polarization can be manipulated in a controlled manner. This allows any selected initial and final polarization direction of the neutrons to be obtained. We have constructed a prototype device using high-Tc superconducting films and mu-metal to isolate regions with different magnetic fields and tested device performance in transmission geometry. Finite-element methods were used to simulate the device's field profile and these have been verified by experiment using a small solenoid as a test sample. Measurements are reported using both monochromatic and polychromatic neutron sources. The results show that the device is capable of extracting sample information and distinguishing small angular variations of the sample magnetic field. As a more realistic test, we present results on the characterization of a 10 μm thick Permalloy film in zero magnetic field, as well as its response to an external magnetic field.",

author = "T. Wang and Parnell, {S. R.} and Hamilton, {W. A.} and F. Li and Washington, {A. L.} and Baxter, {D. V.} and R. Pynn",

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doi = "10.1063/1.4943254",

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T1 - Compact spherical neutron polarimeter using high-Tc YBCO films

AU - Wang, T.

AU - Parnell, S. R.

AU - Hamilton, W. A.

AU - Li, F.

AU - Washington, A. L.

AU - Baxter, D. V.

AU - Pynn, R.

PY - 2016/3

Y1 - 2016/3

N2 - We describe a simple, compact device for spherical neutron polarimetry measurements at small neutron scattering angles. The device consists of a sample chamber with very low (<0.01 G) magnetic field flanked by regions within which the neutron polarization can be manipulated in a controlled manner. This allows any selected initial and final polarization direction of the neutrons to be obtained. We have constructed a prototype device using high-Tc superconducting films and mu-metal to isolate regions with different magnetic fields and tested device performance in transmission geometry. Finite-element methods were used to simulate the device's field profile and these have been verified by experiment using a small solenoid as a test sample. Measurements are reported using both monochromatic and polychromatic neutron sources. The results show that the device is capable of extracting sample information and distinguishing small angular variations of the sample magnetic field. As a more realistic test, we present results on the characterization of a 10 μm thick Permalloy film in zero magnetic field, as well as its response to an external magnetic field.

AB - We describe a simple, compact device for spherical neutron polarimetry measurements at small neutron scattering angles. The device consists of a sample chamber with very low (<0.01 G) magnetic field flanked by regions within which the neutron polarization can be manipulated in a controlled manner. This allows any selected initial and final polarization direction of the neutrons to be obtained. We have constructed a prototype device using high-Tc superconducting films and mu-metal to isolate regions with different magnetic fields and tested device performance in transmission geometry. Finite-element methods were used to simulate the device's field profile and these have been verified by experiment using a small solenoid as a test sample. Measurements are reported using both monochromatic and polychromatic neutron sources. The results show that the device is capable of extracting sample information and distinguishing small angular variations of the sample magnetic field. As a more realistic test, we present results on the characterization of a 10 μm thick Permalloy film in zero magnetic field, as well as its response to an external magnetic field.

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Compact spherical neutron polarimeter using high-T_c YBCO films

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