Theory of Operation
2021 Microchip Technology Inc.
DS50003057A-page 29
FIGURE 5-3:
Schematic of the Model 7610 Cesium Beam Tube.
The Key is as follows:
1. Vacuum ion pump
2. Vacuum Jacket
3. Cesium oven
4.”A” magnet assembly
5. Magnetic shield (2X)
6. RF resonator
7. RF input window
8. “B” magnet assembly
9. Electron multiplier
10. Mass spectrometer
11. Hot-wire ionizer
The key components of the CBT are contained within a welded stainless vacuum ves
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sel (2), wherein an ion pump (1) maintains a high vacuum that minimizes signal atten
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uation due to collisions between Cesium atoms in the beam and background gas. The
Cesium oven (3) contains a volume of Cesium, adequate to provide the necessary
Cesium beam flux for the lifetime of the CBT. The oven is monitored by a thermistor and
maintained at constant temperature by the CBT power supply. A collimator assembly
at the output aperture of the oven forms a beam directed down the axis of the CBT. An
inhomogeneous magnetic field, generated by the “A”-magnet state selector (4) sepa
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rates the beam into two components, each of which is principally composed of atoms
in one of the two hyperfine states, F = 3 or F = 4. One of these components is directed
down the axis of the beam tube while the other is discarded. The beam, composed prin
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cipally of atoms in the one hyperfine state passes through a double- walled magnetic
shield (5) into the resonance interrogation region, within which a small magnetic bias
field (the C-field) serves to separate the magnetic sub-states of the hyperfine level
while maintaining its quantization axis. Within the interrogation region, the atoms pass
through the U-shaped resonance cavity (6, the Ramsey cavity), which induces a
spin-flip resonance response with the characteristic Ramsey pattern (see the following
Summary of Contents for 4310B
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