Electron beam ion source

The Electron Beam Ion Source (EBIS) developed by D.I.S Germany features an ultra-compact design while still being capable of producing up to nA beam currents of multi-charged ions of all gaseous elements and compounds. 
The EBIS is characterized by a highly modularized setup allowing for a wide variety of ion source performance configurations and therefore provides an operator-friendly introduction to the world of highly charged ions for various applications. 

Principle of Operation

The ion production in an EBIS is based on electron impact ionization in a high-density electron beam which is compressed by a strong magnetic field produced by permanent magnets. An electron gun with a cathode of high emissivity produces the electron beam. The ions which are produced by successive electron impact ionization inside the electron beam are radially confined by the negative space charge of the electron beam. Axial confinement of the ions is achieved by superposition of electrostatic potentials generated using a minimum of three collinear drift tubes. The higher potentials of the outer drift tubes create an axial electrostatic trap. Hence, the ionization time of the ions can be controlled by periodically switching the axial trap potentials on and off. 
The magnetic field for electron beam compression is generated by a special magnet system which consists of permanent magnet rings. The electron beam is dumped in an electron beam collector where the electrons are separated from the extracted ions. Usually EBIS are equipped with one or more radial ports. This allows for spectrometry of electromagnetic radiation produced in the region of the ion trap during the ionization process.  

Principal operation scheme of an electron beam ion source (EBIS). 
Figure 1: Principal operation scheme of an electron beam ion source (EBIS).

Special Features

  • viewport for x-ray, UV or EUV spectroscopy
  • spectroscopy and ion extraction are possible simultaneously
  • production of highly or lowly charged ions, depending on operational parameters
  • ion extraction in transmission mode, leaky mode or pulsed mode with precise timing control
  • compact, modularized, and scalable design 
  • easily combinable with other ion beam related equipment (e.g. Wien filter) 
  • optimized for high pumping efficiency to ensure time efficient start-up and to avoid recombination effects on neutrals 
  • bakeable NdFeB permanent magnets
  • two cathode options with different diameters available, according to the field of application: 
    • cost optimized cathode with moderate ionization power and trap capacity
    • high-emissive cathode yielding high ionization power and higher electrical trap capacity

Individual EBIS with task-optimized solutions and performance are offered as well. 

For further questions, please do not hesitate to contact our team of physicists and engineers. 

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