EDM
literature
Polarized He-3
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Steady-state production of high nuclear polarization in 3He-4He mixtures
Candela, D.; Hayden, M.E.; Nacher, P.J.
Physical Review Letters, 73 (1994) 2587
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Spin-polarizing 3He nuclei with an arc-lamp-pumped neodymium-doped lanthanum magnesium
hexaluminate
Gentile, Thomas R.; McKeown, Robert D.
Physical Review A47 (1993) 456
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NMR calibration of optical measurement of nuclear polarization in 3He
Lorenzon, W.; Gentile, T.R.; Gao, H.; McKeown, R.D.
Physical Review A47 (1993) 468
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Steady state production of high nuclear polarizations in a 3He-4He mixture and observation of spontaneous
transverse magnetization
Nacher, P.J. , Candela, D.; Hayden, M.E.
Physica B 194-196 (1994) 847-848
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Optical pumping of helium with arc lamp excited LNA lasers
Aminoff C.G., Larat, C., Laloe, F.
Revue Phys. Appl. 24 (1989) 827
- Comparison of metastability-exchange optical pumping sources
Gentile TR. Hayden ME. Barlow MJ.
Journal of the Optical Society of America B-Optical Physics. 20(10):2068-2074, 2003
- COMPRESSION OF HE-3 BY REFLUXING HE-4 - A MODEL FOR COMPUTING HEVAC EFFECTS IN HE-3-HE-4
MIXTURES
Nacher PJ. Cornut M. Hayden ME.
Journal of Low Temperature Physics. 97(5-6):417-443, 1994
This article comprises the first part of a study concerning the effect that a flow of
gaseous He-4 has on the concentration distribution of He-3 atoms in the presence of a
superfluid film. We present a simple model in which hydrodynamic effects in the gas phase
(diffusion and viscosity), and local thermodynamic equilibrium with a superfluid film are
considered. Results are derived and discussed for the simple case in which a heat flow is
sustained along a cylindrical tube lined with a helium film. This heat flux drives a
superfluid flow in the film, and a corresponding counterflow of He-4 in the vapour. The
pressure, temperature, He-3 concentration, and film thickness profiles along the tube are
computed. Over a wide range of conditions, a dramatic reduction of the He-3 concentration, a
large temperature increase, and a spectacular film thinning towards hotter regions are
predicted to result from a heat flow. The results of a series of experiments supporting this
model will be presented in a forthcoming article.
- EXPERIMENTAL STUDIES OF HELIUM VAPOUR REFLUXING IN NARROW TUBES
Hayden ME. Cornut M. Nacher PJ.
Physica B. 194(Part 1):677-678, 1994
We report the results of pressure, temperature, and isotopic concentration measurements in
tubes lined with a thermally driven, flowing superfluid film. For pure He-4 films, vapour
refluxing generates gradients in both pressure and temperature. With the addition of a few
percent of He-3, pressure gradients are dramatically reduced and the refluxing of He-4 atoms
in the vapour couples gradients in temperature and isotopic concentration. We have observed
that the He-3 concentration at the hot end of a narrow tube can be decreased by a factor
greater than 10(4). These results can be interpreted in terms of a recently developed model
which includes a description of the hydrodynamics of the refluxing vapour.
- STEADY STATE PRODUCTION OF HIGH NUCLEAR POLARIZATIONS IN A HE-3-HE-4 MIXTURE AND OBSERVATION
OF SPONTANEOUS TRANSVERSE MAGNETIZATION
Nacher PJ. Candela D. Hayden ME.
Physica B. 194(Part 1):847-848, 1994
A new technique for maintaining large He-3 nuclear spin polarizations (M almost-equal-to
50%) in liquid He-3-He-4 mixtures (concentration x almost-equal-to 5%) is described. He-3
atoms are continuously circulated between the liquid mixture and a room temperature volume in
which they are polarized by optical pumping. The experiment takes place in a low, homogeneous
magnetic field (B0 congruent-to 3G), so that the magnetization of the sample plays a key role
in NMR experiments. When the nuclear spins are polarized in the upper energy Zeeman state, a
precessing transverse magnetization can spontaneouly appear in the sample.
NMR
Scintillation