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Title: Note: Spin-exchange optical pumping in a van

Abstract

The advent of spin-hyperpolarization techniques designed to overcome the sensitivity issue of nuclear magnetic resonance owing to polarization transfer from more ordered systems has recently raised great enthusiasm. However, the out-of-equilibrium character of the polarization requires a close proximity between the area of production and the site of use. We present here a mobile spin-exchange optical pumping setup that enables production of laser-polarized noble gases in a standalone mode, in close proximity to hospitals or research laboratories. Only compressed air and mains power need to be supplied by the host laboratory.

Authors:
;  [1]; ; ; ; ; ;  [2]
  1. SB2SM, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif sur Yvette (France)
  2. NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette (France)
Publication Date:
OSTI Identifier:
22482844
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COMPRESSED AIR; DESIGN; EQUILIBRIUM; LASERS; NUCLEAR MAGNETIC RESONANCE; OPTICAL PUMPING; POLARIZATION; RARE GASES; SENSITIVITY; SPIN EXCHANGE

Citation Formats

Chauvin, C., Liagre, L., Boutin, C., Mari, E., Léonce, E., Carret, G., Coltrinari, B., and Berthault, P., E-mail: patrick.berthault@cea.fr. Note: Spin-exchange optical pumping in a van. United States: N. p., 2016. Web. doi:10.1063/1.4940928.
Chauvin, C., Liagre, L., Boutin, C., Mari, E., Léonce, E., Carret, G., Coltrinari, B., & Berthault, P., E-mail: patrick.berthault@cea.fr. Note: Spin-exchange optical pumping in a van. United States. doi:10.1063/1.4940928.
Chauvin, C., Liagre, L., Boutin, C., Mari, E., Léonce, E., Carret, G., Coltrinari, B., and Berthault, P., E-mail: patrick.berthault@cea.fr. Fri . "Note: Spin-exchange optical pumping in a van". United States. doi:10.1063/1.4940928.
@article{osti_22482844,
title = {Note: Spin-exchange optical pumping in a van},
author = {Chauvin, C. and Liagre, L. and Boutin, C. and Mari, E. and Léonce, E. and Carret, G. and Coltrinari, B. and Berthault, P., E-mail: patrick.berthault@cea.fr},
abstractNote = {The advent of spin-hyperpolarization techniques designed to overcome the sensitivity issue of nuclear magnetic resonance owing to polarization transfer from more ordered systems has recently raised great enthusiasm. However, the out-of-equilibrium character of the polarization requires a close proximity between the area of production and the site of use. We present here a mobile spin-exchange optical pumping setup that enables production of laser-polarized noble gases in a standalone mode, in close proximity to hospitals or research laboratories. Only compressed air and mains power need to be supplied by the host laboratory.},
doi = {10.1063/1.4940928},
journal = {Review of Scientific Instruments},
number = 1,
volume = 87,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2016},
month = {Fri Jan 15 00:00:00 EST 2016}
}
  • Optical pumping of potassium atoms followed by spin-exchange scattering with deuterium atoms in a high magnetic field was found to produce an intense, highly spin-polarized beam of atomic deuterium. In particular, the atomic polarization of deuterium was determined to be (73{plus minus}3)% at an intensity of 2.1{times}10{sup 17} atoms/s.
  • We have produced highly spin-polarized atomic hydrogen by spin-exchange optical pumping. A tunable ring dye laser is used to polarize rubidium atoms by optical pumping. The cell containing the rubidium vapor is coated with paraffin in order to reduce spin relaxation due to wall collisions. Hydrogen gas is dissociated in an inductive discharge and flows continuously through the cell, in which the hydrogen atoms are polarized by spin-exchange collisions with the polarized rubidium atoms. Atomic-hydrogen polarization as high as 2{l angle}{ital J}{sub {ital z}}{r angle}{sub H}=0.72(6) has been observed, which is the highest polarization yet produced by this method. However,more » the rubidium polarization may be limited to this value due to radiation trapping at higher rubidium densities. The spin-relaxation rate of atomic hydrogen on a paraffin-coated cell is also measured and corresponds to about 7600 wall bounces between wall relaxation.« less
  • Optically pumped spin-exchange sources for polarized hydrogen and deuterium atoms have been demonstrated to yield high atomic flow and high electron spin polarization. For maximum nuclear polarization the source has to be operated in spin temperature equilibrium, which has already been demonstrated for hydrogen. In spin temperature equilibrium the nuclear spin polarization P{sub I} equals the electron spin polarization P{sub S} for hydrogen and is even larger than P{sub S} for deuterium. We discuss the general properties of spin temperature equilibrium for a sample of deuterium atoms. One result are the equations P{sub I}=4P{sub S}/(3+P{sub S}{sup 2}) and P{sub zz}=P{submore » S}{center_dot}P{sub I}, where P{sub zz} is the nuclear tensor polarization. Furthermore we demonstrate that the deuterium atoms from our source are in spin temperature equilibrium within the experimental accuracy.« less