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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. 2015.
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Examples from the web for space charge
  • 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.
  • Ions are trapped radially by the space charge of the electron beam itself, and axially by voltages applied to the end drift tubes.
Encyclopedia Article for 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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