space charge

noun Electricity.
a distribution of an excess of electrons or ions over a three-dimensional region, in contrast to the distribution of an electric charge over the surface of a conductor.

1910–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

space charge

electrical charge distributed through a three-dimensional region. In an electron tube, for example, a negative charge results because electrons that are emitted from the cathode do not travel instantaneously to the plate (anode) but require a finite time for the trip. These electrons form a cloud around the cathode, the cloud being continually depleted by electrons going to the plate and replenished by electrons emitted from the cathode. It is this cloud of electrons that produces the negative space charge.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Facility costs are recovered via a space charge which is distributed on square
  feet occupied for organizational units.
The space charge field of the electron beam would pull ions out of the plasma
  layer into the beam.
The large energy spread and bunch lengthening due to space charge effect
  prevents it from reaching below ps.
Develop lattice tuning for the beam without space charge.
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