Electron Source 40C1


The ES 40C1 Electron Source is a scanable electron gun with small spot profile. Due to the high transmission of its Einzel-Lens, the ES 40C delivers a high electron beam current over a wide energy range. The ES 40C1 is designed for a stable and reliable operation in e.g. AES, scanning applications,imaging, EELS and electron pulse or desorption experiments.


  • Fine focus microformed tip cathode
  • Scannable electron source with a small spot profile
  • Integrated scan and deflection unit
  • Software control (basic version)


  • Software extension – can be integrated with RAPID SE
  • Linear shift


Technical data

Mounting flange: Rotatable, DN 40CF  
Bakeout temperature: 250°C
Water cooling: Not required
Insertion length: min. 156 mm, (other on request) OD: 34.5 mm
Energy range: 1 eV - 5 keV
Spot size: 120 µm
Scan area: 10 mm x 10 mm
(for working distance of 75 mm)
Cathode type: Thoriated Tungsten
Shield Cooper or mu-metal