Noble diode pump

A noble diode pump is a type of ion pump used in high vacuum applications that employs both a chemically reactive cathode, such as titanium, and an additional cathode composed of tantalum. The tantalum cathode serves as a high-inertia crystal lattice structure for the reflection and burial of neutrals, increasing pumping effectiveness of inert gas ions.^[1] Pumping intermittently high quantities of hydrogen with Noble diodes should be done with great care, as hydrogen might over months get re-emitted out of the tantalum.

See also

• Standard diode pump

References

1. ^ The pumping of helium and hydrogen by sputter-ion pumps

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