Dear colleagues,
As you know there are some ways to compensate the space charge in positive ion beams. As far as i know depending on the beam current, energy, and pulse duration the following three typical types of compensation can be outlined:
I. Continuous high energy beams: In this case the compensating electrons are generated mainly at the gas ionization by the ion beam itself.
II. Continuous ion beams of low energy: In this case the compensation is make available mainly by electrons formed at the gas ionization by fast electrons knocked out of the target or the drift chamber walls and accelerated by the space charge field.
III. Pulsed ion beams: In this case either tungsten filaments heated up to emission temperature and placed in the beam, or targets with knocking out the electrons by the beam ions, or finally the sources of quasi-neutral plasma.
I would like to know what space charge compensations method you are using and what are the parameters of the compensated and uncompensated ion beam.
Thanks in advance and hope to hear from you.
Mohsen
My background is in ion propulsion for spacecraft. We used a hollow-cathode neutralizer to generate a secondary plasma located adjacent to the propulsive ion beam which of its own accord would allow electrons to be drawn into the ion beam to neutralize the space charge resulting in a fully neutralized high-energy ion beam. You can find a diagram of the neutralizer in the article https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19730022011.pdf
You should look up the literature on Ion Propulsion - mainly in the American Institute of Aeornautics and Astronautics AIAA. Here, as small auxiliary discharge, called a neutralizer, is very efficient in instantaneously neutralizing the beam with minimal disturbance of the beam's electrical potential.
We use filament neutralizers which provide necessary electrons for compensating the positive space charge of the ion beam.
- Badges
- Science topic
- Similar topics
- Mathematics
- Statistics
- Regression