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Repetitive nanosecond glow discharge in atmospheric pressure air

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Repetitive nanosecond glow discharge in atmospheric pressure air
作者:	Packan, Denis.
面頁冊數:	164 p.
附註:	Adviser: Charles H. Kruger.
附註:	Source: Dissertation Abstracts International, Volume: 64-11, Section: B, page: 5582.
Contained By:	Dissertation Abstracts International64-11B.
標題:	Physics, Fluid and Plasma.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3111775
ISBN:	0496593056

Repetitive nanosecond glow discharge in atmospheric pressure air
Packan, Denis.

Repetitive nanosecond glow discharge in atmospheric pressure air [electronic resource] - 164 p.

Adviser: Charles H. Kruger.

Thesis (Ph.D.)--Stanford University, 2004.

Electrical and optical methods were developed to measure the electron density in the discharge. The electron density was measured from the electrical conductivity during both the pulse and recombination phases, from the absolute intensity of the N2 Second Positive system during the pulse phase, and from the NO-gamma system during the recombination phase. The average electron density was found to be 1.4 x 1012 cm -3 for the 100 kHz discharge, and 1.8 x 102 cm-3 for the 30 kHz discharge, with peak values of 2 x 1012 cm-3 and 1013 cm-3, respectively.

ISBN: 0496593056Subjects--Topical Terms:

227264
Physics, Fluid and Plasma.

Repetitive nanosecond glow discharge in atmospheric pressure air
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502 $a Thesis (Ph.D.)--Stanford University, 2004.
520 # $a Electrical and optical methods were developed to measure the electron density in the discharge. The electron density was measured from the electrical conductivity during both the pulse and recombination phases, from the absolute intensity of the N2 Second Positive system during the pulse phase, and from the NO-gamma system during the recombination phase. The average electron density was found to be 1.4 x 1012 cm -3 for the 100 kHz discharge, and 1.8 x 102 cm-3 for the 30 kHz discharge, with peak values of 2 x 1012 cm-3 and 1013 cm-3, respectively.
520 # $a Nonequilibrium, weakly ionized plasmas are widely used in the industry, but they are restricted to the domain of continuous discharges at low gas pressure or with specialty gases because of stability and power budget constraints. In this study, repetitively pulsed discharges were investigated as a way to decrease the power budget of atmospheric air plasmas by several orders of magnitude compared to continuous discharges, for an electron density of 1012 cm-3. The principle of the pulsed scheme is to use nanosecond electrical pulses to ionize air diffusely and with high efficiency, and to match the pulse interval with the recombination time of the plasma in order to maintain an elevated average electron density. Maxwellian and non-Maxwellian models of the physical processes in the discharge were examined, and the discharge parameters were chosen to minimize the power. Using a 10 ns, 12 kV, 100 kHz repetitive pulse generator, it was found that a repetitive nanosecond glow discharge could be operated in stable manner in atmospheric pressure air at 2000 K at an electron density of about 10 12 cm-3. Two pulsed discharges, with repetition frequencies of 100 kHz and 30 kHz, are described in this work. The electrode gap is 1 cm and the pulsed voltage is about 5 kV/cm.
520 # $a The power budget for the 30 kHz discharge was measured, from the voltage and current during the pulse phase, to be about 10 W/cm3, which represents an improvement of a factor 540 compared to a DC discharge producing the same electron density.
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