NDLI: Gas cells for $^{3}$He hyperpolarized via spin-exchange optical pumping

Content Provider	Springer Nature Link
Author	Kim, A. Stepanyan, S. S. Tan, J. A. Kim, W. Woo, S.
Copyright Year	2016
Abstract	We present a device for the production of hyperpolarized $^{3}$He, which is widely used in spinrelated nuclear physics research. Spin-exchange optical pumping (SEOP) is employed to polarize $^{3}$He enclosed in a circular borosilicate glass cell suitable not only for the production of polarized gas but also for its storage. The portable glass cell can, thus, be transported to any other research facility. The glass cell can be refilled several times. Special attention is given to the preparation and the filling of the cell to minimize the impurities on its walls and in the gas. We employ glass tubes with shorter lengths and larger diameters in the gas-filling system to achieve the improvement in the air flow necessary to obtain purer polarized $^{3}$He samples. The cell is prepared, and after it has been filled with rubidium (Rb) and $^{3}$He-N$_{2}$ mixture, it is sealed under high vacuum conditions. The cell containing the mixture is exposed to circularly-polarized laser light with a wavelength of 795 nm at temperatures of 180 - 220 °C for SEOP. The polarization of $^{3}$He is measured via nuclear magnetic resonance (NMR). We obtained 40% polarized $^{3}$He in less than 15 hours and 50% in about 25 hours. The longitudinal relaxation time T $_{1}$ of the polarized $^{3}$He we measured was about 58 hours.
Starting Page	183
Ending Page	189
Page Count	7
File Format	PDF
ISSN	03744884
Journal	Journal of the Korean Physical Society
Volume Number	68
Issue Number	2
e-ISSN	19768524
Language	English
Publisher	The Korean Physical Society
Publisher Date	2016-02-02
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spin-exchange optical pumping Hyperpolarized $^{3}$He Theoretical, Mathematical and Computational Physics Physics Particle and Nuclear Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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