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Space Charge in Ionization Detectors

Document #:
Document type:
DUNE document
Submitted by:
Kirk McDonald
Updated by:
Kirk McDonald
Document Created:
01 Jun 2016, 22:13
Contents Revised:
01 Jun 2016, 22:13
Metadata Revised:
01 Jun 2016, 22:13
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The continual production of electron-ion pairs in a liquid argon detector leads to a bulk charge density in the liquid, because the electron and ion drift velocities are very different. The resulting positive space charge distribution perturbs the nominal electric field in the detector, particularly if it is close to the surface.

This note presents a 1-dimensional approximation to the perturbed electric field. The situation in a 3-dimensional detector is more complicated, such that straight tracks would be reconstructed as curved if corrections for space charge are not applied.

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