Can Corona Discharge Occur Around Charged Glass/Dielectric?

[Peter Ahlman]

...Considering there is NO dielectric breakdown or breaking of glass/dielectric.....

Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity?
For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage like 4 millions. Electrons will be emitted from the electrode in the vacuum, but will there be a CORONA discharge in the free air outside and around the glass-tube?

Regards
Peter

 

[Vailanor]

.No, there will not be a corona discharge around a charged glass/dielectric without a conductor in the vicinity. Corona discharges require a conductive medium such as air or water to occur, and since glass/dielectrics are insulators, they cannot create a path for the electrons to move along.