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Updated: Jan 28, 2026

Cryo-electron Microscopy Specimen Preparation By Means Of a Focused Ion Beam
Published on: July 26, 2014
Double-coil magnetic focusing of the electron beam generated by a plasma-cathode electron source
I Yu Bakeev1, A S Klimov1, E M Oks1
1Tomsk State University of Control Systems and Radioelectronics, Tomsk 634050, Russia.
Abstract:
We present the results of our investigations of magnetic focusing of the electron beam generated by a plasma-cathode electron source in the forevacuum pressure range (10-30 Pa). We show that a magnetic double-focusing system employing two separate field coils with the main magnetic coil located close to the beam collector at the focal plane provides effective and efficient focusing of the electron beam. With our e-beam source, this focusing system produces a power density of more than 1 MW/cm2 at the electron beam focus with an accelerating voltage of 30 kV and a beam current up to 60 mA. For comparison, the maximum beam power density provided by plasma-cathode electron sources at pressures of less than 0.1 Pa is at the level of 10 MW/cm2.
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