Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
Experiments to Control Atom Number and Phase-Space Density in ...
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angle<br />
valve<br />
rotary<br />
feedthrough<br />
ion gauge<br />
Ti:Sub<br />
pump<br />
ion<br />
pump<br />
Li reservoir<br />
Figure 7.2: Oven chamber.<br />
chamber, the wall thickness is decreased above the reservoir. The oven is attached <strong>to</strong><br />
a modified 6 <strong>in</strong>ch nipple with a nickel gasket. The choice of gasket material is based<br />
on the fact that hot lithium can attack copper gaskets, which, over time, can lead <strong>to</strong> a<br />
vacuum leak. This can be avoided by the use of the nickel gasket.<br />
Figure 7.3: Lithium oven. The lithium is loaded <strong>in</strong><strong>to</strong> the reservoir which is heated <strong>to</strong><br />
create an effusive beam of lithium a<strong>to</strong>ms. Decreased wall thickness close <strong>to</strong> the reservoir<br />
(right) limits the heat flow from the reservoir <strong>to</strong> the rest of the vacuum chamber. The<br />
outer diameter of the reservoir is 1.5 <strong>in</strong>.<br />
A rotary feedthrough (Accuglass Products Inc., HTR-133) is attached <strong>to</strong> the<br />
bot<strong>to</strong>m of the 6 <strong>in</strong>ch nipple. This feedthrough is controlled by a stepper mo<strong>to</strong>r. Due<br />
<strong>to</strong> space constra<strong>in</strong>ts, a cus<strong>to</strong>m coupl<strong>in</strong>g is located between the stepper mo<strong>to</strong>r <strong>and</strong> the<br />
rotary feedthrough. The rotary feedthrough blocks <strong>and</strong> unblocks the effusive a<strong>to</strong>mic<br />
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