1. Polarized 3He gas compression system using metastability-exchange optical pumping.
- Author
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Hussey, D. S., Rich, D. R., Belov, A. S., Tong, X., Yang, H., Bailey, C., Keith, C. D., Hartfield, J., Hall, G. D. R., Black, T. C., Snow, W. M., Gentile, T. R., Chen, W. C., Jones, G. L., and Wildman, E.
- Subjects
COMPRESSORS ,GASES ,POLARIZATION (Nuclear physics) ,OPTICAL pumping ,PARTICLES (Nuclear physics) ,LASERS - Abstract
Dense samples (10–100 bar cm) of nuclear spin polarized
3 He are utilized in high energy physics, neutron scattering, atomic physics, and magnetic resonance imaging. Metastability exchange optical pumping can rapidly produce high3 He polarizations (≈80%) at low pressures (few mbar). We describe a polarized3 He gas compressor system which accepts 0.26 bar l h-1 of3 He gas polarized to 70% by a 4 W neodymium doped lanthanum magnesium hexaluminate (Nd:LMA) laser and compresses it into a 5 bar cm target with final polarization of 55%. The spin relaxation rates of the system’s components have been measured using nuclear magnetic resonance and a model of the3 He polarization loss based on the measured relaxation rates and the gas flow is in agreement with a3 He polarization measurement using neutron transmission. [ABSTRACT FROM AUTHOR]- Published
- 2005
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