Direct current glow discharges in atmospheric air

Mohamed, Abdel‐Aleam H.; Block, R.; Schoenbach, K.H.

doi:10.1109/ppps.2001.961119

Cited by 3 publications

(2 citation statements)

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“…achieved. The electron density of this discharge is estimated to be 10 14 m -3 using the method outlined in [22,25]. While this calculation is fairly crude, the present study is several orders of magnitude lower than previous studies [12,26].…”

Section: Figure 21 a Typical Microhollow Cathode Geometry [16]mentioning

confidence: 55%

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Shock wave interaction with a toroidal air plasma

Lodes¹

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DEDICATIONThis work is dedicated to those who have supported me throughout my academic career. I am especially grateful to my parents, Donald and Joan Lodes, my brother, Andy Lodes, my loving girlfriend, Audrey Spalding, and all my close friends for their support and encouragement through this process. ii ACKNOWLEDGEMENTS First, I would like to express my thanks to Dr. Randy Curry for this opportunity and his continued efforts in this research program. Dr. Curry has continually pushed me to do more and he has heavily influenced my education in this field of research. I also would like to recognize the contributions of Michael Rudroff, who is pursuing his M.S. for related research and assisted greatly in the construction of the test bed and collection of the data on this program. Additional contributions have been made by numerous undergraduate research assistants as well as technicians Scott Booska and Mark Nichols.

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Section: Figure 21 a Typical Microhollow Cathode Geometry [16]mentioning

confidence: 55%

“…A MHCD source is an attractive option for the interaction with shock waves, as previous studies have produced discharges in air [21,[22][23][24][25], and other studies have observed electron densities of these devices of at least 10 21 m -3 [12,26].…”

Section: Figure 21 a Typical Microhollow Cathode Geometry [16]mentioning

confidence: 99%

Shock wave interaction with a toroidal air plasma

Lodes¹

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Pulsed electron heating of atmospheric pressure air glow discharges

Stark

Merhi

Schoenbach

PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pu

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By applying electric field pulses with duration small compared to the time constant for glow-to-arc transition it is possible to increase the electron energy in high pressure glow discharges considerably over the steady state value. Repetitive pulsed operation allows us to generate plasmas with high average electron density at lower energy cost than with dc heating only. Measurements of the dynamics of the plasma column after pulse application show that the plasma diameter approaches a steady-state value after initial expansion, which is approximately half the dc plasma diameter. As a first step towards repetitive pulsed electric field operation, required to obtain a semi-dc plasma with high average electron density we have measured the temporal development of the voltage across the plasma for two subsequent pulses. The dual pulse generator, built for this purpose, utilizes two, IO S2 striplines with high pressure spark gap as switches, which deliver two subsequent pulses directly to the load. The trigger pulses for the two switches can be adjusted in time between 1 ps and 10 ms. Pulse amplitudes of 15 kV have been reached, but amplitudes of up to 50 kV seem to be possible. Experiments with the dual pulse system provide information on the repetition rate required to sustain a certain average electron density. Operation in atmospheric pressure air with applied electric fields of 20 kVlcm and 10 ns duration allowed us to increase the electron density for a time of 2.3 ps to such values that the discharge voltage stayed below 30 V. Continuous operation in this discharge state would consequently require repetition rates of 450 kHz. Higher pulsed electric field operation would allow us to reduce the repetition rate.

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