TY - GEN
T1 - Similarities of dielectric surface flashover at atmos-pheric conditions for pulsed unipolar and RF excitation
AU - Krile, J.
AU - Edmiston, G.
AU - Neuber, A.
AU - Dickens, J.
AU - Krompholz, H.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007
Y1 - 2007
N2 - Mechanisms in vacuum flashover caused by rf (f<10 GHz) or unipolar voltages are virtually identical. Similarities between rf (representing high power microwave window breakdown on the high pressure side) and unipolar flashover are expected in an atmospheric environment as well. Our experimental setups enable studying both unipolar flashover and rf window flashover at atmospheric conditions while controlling excitation, temperature, pressure, humidity, and type of gas present. The local electric field at the flashover initiating points has been numerically calculated in detail for all test geometries. For both rf and unipolar pulsed excitation, the flashover dynamics are changed by the application of UV light to the dielectric surface. A UV pre-pulse has a distinct impact on the arc's path and a tendency to increase the hold-off electric field. The effect of humidity on the hold-off electric field for both pulsed unipolar and rf excitations, along with temporally resolved emission spectroscopy of the flash-over event, will be discussed.
AB - Mechanisms in vacuum flashover caused by rf (f<10 GHz) or unipolar voltages are virtually identical. Similarities between rf (representing high power microwave window breakdown on the high pressure side) and unipolar flashover are expected in an atmospheric environment as well. Our experimental setups enable studying both unipolar flashover and rf window flashover at atmospheric conditions while controlling excitation, temperature, pressure, humidity, and type of gas present. The local electric field at the flashover initiating points has been numerically calculated in detail for all test geometries. For both rf and unipolar pulsed excitation, the flashover dynamics are changed by the application of UV light to the dielectric surface. A UV pre-pulse has a distinct impact on the arc's path and a tendency to increase the hold-off electric field. The effect of humidity on the hold-off electric field for both pulsed unipolar and rf excitations, along with temporally resolved emission spectroscopy of the flash-over event, will be discussed.
UR - http://www.scopus.com/inward/record.url?scp=45149132034&partnerID=8YFLogxK
U2 - 10.1109/PPC.2005.300631
DO - 10.1109/PPC.2005.300631
M3 - Conference contribution
AN - SCOPUS:45149132034
SN - 078039190X
SN - 9780780391901
T3 - Digest of Technical Papers-IEEE International Pulsed Power Conference
SP - 354
EP - 357
BT - 2005 IEEE Pulsed Power Conference, PPC
Y2 - 13 June 2005 through 17 June 2005
ER -