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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Figure 3.10: A CAD image <strong>of</strong> large crystal holder attached to the rotor. This enables<br />
12.7 mm diameter crystals to be mounted to the rotor tips. The crystals are held<br />
between a threaded aluminum circular plate and a titanium locking ring, exposing a<br />
9 mm diameter region <strong>of</strong> the crystal. The circular plate connects via a threaded hole<br />
to an adapter, which fits in the rotor where the smaller crystals would sit. Figure<br />
Courtesy Max Riedel.<br />
<strong>of</strong> the disc. The spindle also h<strong>as</strong> screw holes drilled around the outside <strong>of</strong> the disc,<br />
which were added to allow for the balancing <strong>of</strong> the rotor and spindle should this be<br />
necessary. The rotating parts <strong>of</strong> the experiment, along <strong>with</strong> the 4−10inch zero length<br />
conflat reducer they are suspended from, are shown in figure 3.9.<br />
As is explained in section 3.3.2.2, the maximum speed <strong>of</strong> the rotor w<strong>as</strong> ini-<br />
tially limited to 42 Hz due to the vibrational stability <strong>of</strong> the spindle. Since the stress<br />
placed on the rotor scales quadratically <strong>with</strong> the rotation rate, being limited to 42 Hz<br />
reduced the expected stresses by an order <strong>of</strong> magnitude. This allowed the size <strong>of</strong> the<br />
crystal to be incre<strong>as</strong>ed, becau<strong>as</strong>e the rotor is strong enough support the incre<strong>as</strong>ed<br />
m<strong>as</strong>s <strong>of</strong> a larger crystal and crystal holder at the tip for these velocities. The larger<br />
crystal incre<strong>as</strong>es the area over which the beam can reflect from the rotor tip, incre<strong>as</strong>-<br />
ing the reflected flux. An image <strong>of</strong> the larger crystal holder can be seen in figure<br />
3.10. The larger crystal holder incre<strong>as</strong>es the diameter <strong>of</strong> the crystals from 5 mm to<br />
12.7 mm. These crystals are clamped between a threaded aluminum circular plate,<br />
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