Experiments with Supersonic Beams as a Source of Cold Atoms
Experiments with Supersonic Beams as a Source of Cold Atoms
Experiments with Supersonic Beams as a Source of Cold Atoms
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-HV PS<br />
4 M<br />
MCP<br />
Anode<br />
10 M 1 M<br />
Transimpedance<br />
Amplifier<br />
Figure 4.16: A Schematic <strong>of</strong> the MCP bi<strong>as</strong> circuit. The voltage across the MCP sets<br />
the gain, typically set at around 1.6 kV. Figure Courtesy Christian Parthey.<br />
Figure 4.17: At left is a photo <strong>of</strong> the MCP extension tube, mounted on a translation<br />
stage. The incre<strong>as</strong>ed distance between the coilgun and the MCP is needed to resolve<br />
the slowed beam from the main peak. At right is a photo <strong>of</strong> the coilgun in the vacuum<br />
chamber, seen through a viewport.<br />
different features <strong>of</strong> the signal, the velocity <strong>of</strong> the atoms that produced that feature<br />
can be me<strong>as</strong>ured. The MCP is located 2.54m (2.59m) from the nozzle in the retracted<br />
(extended) position and 1.68 m (1.73 m) from the end <strong>of</strong> the coilgun. A photo <strong>of</strong> the<br />
MCP mounting extension tube and translation stage, along <strong>with</strong> a photo <strong>of</strong> the coilgun<br />
in the vacuum chamber seen through a viewport are shown in figure 4.17.<br />
Becu<strong>as</strong>e the coils are in vacuum, the water cooling and electrical connections<br />
to the coils are accomplished using feedthroughs. For the water lines, 1/4 inch Swage<br />
is used to make the in-vacuum connections. The electrical feedthroughs are 50 pin<br />
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