Non-magnetic flexible heaters for spin-exchange optical pumping of 3He and other applications

Spin polarized 3He gas is currently widely used in various scientific fields and in medical diagnosis applications. The spin polarization of 3He nuclei can be achieved by spin-exchange optical pumping (SEOP). In SEOP, the 3He gas is enclosed in a glass cell together with alkali metals and is then he...

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Bibliographic Details
Published in:Review of scientific instruments 2016-11, Vol.87 (11), p.115108-115108
Main Authors: Ino, T., Hayashida, H., Kira, H., Oku, T., Sakai, K.
Format: Article
Language:English
Subjects:
Alkali metals
Heat exchange
Heaters
Inhomogeneity
Magnetic fields
Metal vapors
Optical pumping
Polarization (spin alignment)
Scientific apparatus & instruments
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Summary:Spin polarized 3He gas is currently widely used in various scientific fields and in medical diagnosis applications. The spin polarization of 3He nuclei can be achieved by spin-exchange optical pumping (SEOP). In SEOP, the 3He gas is enclosed in a glass cell together with alkali metals and is then heated to maintain the alkali metal vapor pressures at the appropriate levels. However, polarized 3He gas is highly sensitive to any inhomogeneity in its magnetic field, and any small field gradients caused by the heaters may cause degradation of the 3He polarization. To overcome this conflict between the heating process and the magnetic field, we have developed electrical heaters that essentially cause no magnetic fields. These heaters are thin and are flexible enough to be bent to within a radius of a few centimeters. These carefully designed heater elements and a double layer structure effectively eliminate magnetic field generation. The heaters were originally developed for SEOP applications, but can also be applied to other processes that need to avoid unwanted magnetic fields.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4967527