U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

Wide Angle Polarization Analysis with Neutron Spin Filters

Published

Author(s)

Qiang NMN Ye, Thomas R. Gentile, Jeffrey R. Anderson, Collin L. Broholm, WangChun Chen, Z DeLand, Ross W. Erwin, C. B. Fu, John E. Fuller III, Aaron V. Kirchhoff, J. A. Rodriguez-Rivera, V. Thampy, T G. Walker, Shannon Watson

Abstract

We report substantial improvements in a compact wide angle neutron spin filter system that was recently employed on the Multi-Axis Crystal Spectrometer at the Center for Neutron Research at the U.S. National Institute of Standards and Technology. The apparatus consists of a cylindrical 3He polarizer cell and wide-angle 3He analyzer cells, a vertical solenoid to provide a uniform magnetic field, and a shielded radio-frequency solenoid for the polarizer cell. Nuclear magnetic resonance is employed to reverse the polarization in the polarizer cell and monitor the 3He polarization in all cells. The first experiment using this apparatus was carried out with cylindrical analyzer cells with limited angular coverage due to low polarizations in fused quartz cells. We present results for aluminosilicate glass analyzer cells that cover 110 degrees and have long relaxation times (100 h to 200 h). Using two 100 W diode bars spectrally narrowed with chirped volume Bragg gratings, we have obtained 65 % - 80 % 3He polarization in these cells. The 3He polarization has been measured by neutron transmission and electron paramagnetic resonance. Additional progress includes an improved holding field solenoid and decreased spin-flip losses
Citation
Physics Procedia
Pub Type
Journals

Download Paper

Local Download

Keywords

neutron spin filters, polarization analysis
Neutron research and Radiation

Citation

, Q. , , T. , Anderson, J. , Broholm, C. , Chen, W. , DeLand, Z. , Erwin, R. , , C. , Fuller, J. , Kirchhoff, A. , , J. , Thampy, V. , Walker, T. and Watson, S. (2013), Wide Angle Polarization Analysis with Neutron Spin Filters, Physics Procedia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911975 (Accessed April 23, 2024)

Created April 29, 2013, Updated February 19, 2017