MicroBooNE Document 5898-v2

Charging of an Insulator in a Liquid Argon Detector

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Document type:
Design or Technical Note
Submitted by:
Kirk McDonald
Updated by:
Kirk McDonald
Document Created:
01 Jun 2016, 17:40
Contents Revised:
10 Jun 2016, 10:14
Metadata Revised:
10 Jun 2016, 10:14
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10 Jun 2016, 10:41
01 Jun 2016, 21:40
Electrons and ions generated in the liquid argon outside the field cage can drift until they are intercepted by an insulator, which thereby becomes charged. This effect is something like charging of insulators due to corona discharge in high-voltage systems in air. Mitigation of this effect should be based on standard techniques in the high-voltage industry: use of insulators with rounded, not sharp corners; and in extreme high fields, surrounding the insulators with conductive "grading rings".

The tech note reviews analytic calculations that support this lore.

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Notes and Changes:
v2 fixes typos in the figure on p. 9.
Slides charging_061016.pptx gives an overview.
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