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Spin exchange optical pumping based polarized 3He filling station for the Hybrid Spectrometer at the Spallation Neutron Source
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10.1063/1.4809942
/content/aip/journal/rsi/84/6/10.1063/1.4809942
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4809942
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Design of the polarized He filling station. The four major subsystems are gas supply system, gas transfer system (the syringe), a SEOP pumping system, and the wideangle analyzer cell system.

Image of FIG. 2.
FIG. 2.

The schematic for the gas filling system.

Image of FIG. 3.
FIG. 3.

The schematics of the gas transfer system. The 8 in. air cylinder outer casing is not shown for indication purpose.

Image of FIG. 4.
FIG. 4.

The schematics of the valve, bottom piece. Top piece of the aluminum pancake is indicated in Figure 3 , part number 17.

Image of FIG. 5.
FIG. 5.

Schematics of the optical pumping cell (OPC) in different stages. Top left: before baking; top right: after baking; bottom: after optical pumping, capillary blockage test.

Image of FIG. 6.
FIG. 6.

Top: the wide-angle analyzer cell (WAC), design (unit in mm) and picture. Bottom: the Helmholtz-like coil system which is used to provide uniform magnetic field for the WAC.

Image of FIG. 7.
FIG. 7.

Top: the filling station cart with the solenoid removed. Upper left box: cell bake-out oven. Upper center box: piston assembly. Upper right box: servo drive and stiffening enclosure. Lower left box: He and N gas supply bottles. Lower center box: NuPure Getters and gas plumbing. Lower right box: recycle tank.

Image of FIG. 8.
FIG. 8.

Free induction decay signals (mv) vs. time (h). Left: the saturated He polarization slowly decayed with time; right: after we drove Rb to the capillary tubing to isolate the OPC from the valve, the He polarization stayed constant for more than a week, indicating a small gas leakage from the valve.

Image of FIG. 9.
FIG. 9.

The optical pumping cell (OPC) lifetime measurement, the signal decays exponentially with a time constant called lifetime. Left: the OPC lifetime measurement, the fit gives 8.7 ± 0.4 h of lifetime; right: the OPC is blocked from capillary using Rb, the fit gives 10.5 ± 1.6 h of lifetime.

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/content/aip/journal/rsi/84/6/10.1063/1.4809942
2013-06-13
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spin exchange optical pumping based polarized 3He filling station for the Hybrid Spectrometer at the Spallation Neutron Source
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4809942
10.1063/1.4809942
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