Abstract
The pumping speeds of several diode type ion pump elements with cell radii of 5, 5.5, 6, 9, and 12 mm were measured while being subjected to a magnetic field B, ranging from 500 G up to 15 kG, and misalignment angles (angles between the direction of B and the anode axis) from 0° to 13°. The pumping speeds of elements with the 9 and 12 mm cells peaked around 1–2 kG, then dropped off rapidly with an increasing magnetic field. The pumping speeds of the smaller cell elements remained constant with an increasing magnetic field. The pumping speeds of all the elements decreased with increasing misalignment. The measured pumping speeds from this study are three to four times lower than the calculated pumping speeds using previously reported empirical formulas.
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