Compressing spin-polarized 3He with a modified diaphragm pump
نویسندگان
چکیده
منابع مشابه
Compressing Spin-Polarized 3He With a Modified Diaphragm Pump
Nuclear spin-polarized (3)He gas at pressures on the order of 100 kPa (1 bar) are required for several applications, such as neutron spin filters and magnetic resonance imaging. The metastability-exchange optical pumping (MEOP) method for polarizing (3)He gas can rapidly produce highly polarized gas, but the best results are obtained at much lower pressure (~0.1 kPa). We describe a compact comp...
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We study the effects of nuclear polarization M on the liquid-gas equilibrium phase diagram of 3He, in situations where the saturating vapour pressure increases or decreases as a function of M, and where a metamagnetic instability may occur in the liquid phase. Numerical predictions are given within the frame of a phenomenological model with parameters fitted to reproduce accurately the saturati...
متن کاملThermal conductivity of spin-polarized liquid 3He.
We present the first measurements of the thermal conductivity of spin-polarized normal liquid 3He. Using the rapid melting technique to produce nuclear polarizations up to 0.7, and a vibrating wire both as a heater and a thermometer, we show that, unlike the viscosity, the conductivity increases much less than predicted for s-wave scattering. We suggest that this might be due to a small probabi...
متن کاملSPATIAL CORRELATIONS IN SPIN-POLARIZED 3He LIQUID
Variational Fermi HNC calculations are performed for spin-polarized 3 ~ e liquid at zero temperature. The trial wave function is optimized by solving an Euler-Lagrange equation in the Fermi HNC approximation. Results for liquid structure function and one-particle momentum distribution are compared with the corresponding quantities of the spin-saturated liquid. In this report we present results ...
متن کاملSol-gel coated glass cells for spin-exchange polarized 3He
We have developed a high-purity sol-gel coating for the interior surface of glass cells used for polarizing He by spin-exchange optical pumping. The coating is designed to minimize spin relaxation due to wall collisions. A longitudinal spin-relaxation time T1 in a sol-gel coated Pyrex cell of 34468 h was achieved, the longest T1 we have ever recorded for a gaseous sample. Repeated trials indica...
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ژورنال
عنوان ژورنال: Journal of Research of the National Institute of Standards and Technology
سال: 2001
ISSN: 1044-677X
DOI: 10.6028/jres.106.033