Pressure dependence of plasma structure in microwave gas breakdown at 110 GHz
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Recent studies of 110 GHz microwave discharges in air at atmospheric pressure have demonstrated formation of a large array of quarter-wavelength-spaced plasma filaments. Here we present measurements showing that as pressure is decreased from atmosphere to a few torr, the discharge transitions from a well-defined array to a smeared-out array and finally to a diffuse plasma. Despite the distinct nature of breakdown phenomena at high microwave frequencies, the pressure dependence of the breakdown threshold field is seen to follow a Paschen-type curve. Data for air and argon at 110 GHz are compared with previous low-frequency data.
- OSTI ID:
- 21367003
- Journal Information:
- Applied Physics Letters, Vol. 97, Issue 1; Other Information: DOI: 10.1063/1.3462320; (c) 2010 American Institute of Physics; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AIR
ARGON
ATMOSPHERES
ATMOSPHERIC PRESSURE
GHZ RANGE 100-1000
HIGH-FREQUENCY DISCHARGES
MICROWAVE RADIATION
PLASMA
PLASMA FILAMENT
PRESSURE DEPENDENCE
WAVELENGTHS
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
FREQUENCY RANGE
GASES
GHZ RANGE
NONMETALS
RADIATIONS
RARE GASES
AIR
ARGON
ATMOSPHERES
ATMOSPHERIC PRESSURE
GHZ RANGE 100-1000
HIGH-FREQUENCY DISCHARGES
MICROWAVE RADIATION
PLASMA
PLASMA FILAMENT
PRESSURE DEPENDENCE
WAVELENGTHS
ELECTRIC DISCHARGES
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
FREQUENCY RANGE
GASES
GHZ RANGE
NONMETALS
RADIATIONS
RARE GASES