Plasma density profiles and finite bandwidth effects on electron heating

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5563310

Spielman, R. B.; Mizuno, K.; DeGroot, J. S.; Bollen, W. M.; Woo, W.

Intense, p-polarized microwaves are incident on an inhomogeneous plasma in a cylindrical waveguide. Microwaves are mainly absorbed by resonant absorption near the critical surface (where the plasma frequency, ..omega../sub pe/, equals the microwave frequency, ..omega../sub o/). The localized plasma waves strongly modify the plasma density. Step-plateau density profiles or a cavity are created depending on the plasma flow speed. Hot electron production is strongly affected by the microwave bandwidth. The hot electron temperature varies as T/sub H/ is proportional to (..delta.. ..omega../..omega..)/sup -0/ /sup 25/. As the hot electron temperature decreases with increasing driver bandwidth, the hot electron density increases. This increase is such that the heat flux into the overdense region (Q is proportional to eta/sub H/T/sub H//sup 3/ /sup 2/) is nearly constant.

• Research Organization: California Univ., Davis (USA). Dept. of Applied Science
• DOE Contract Number: EY-76-C-04-0789
• OSTI ID: 5563310
• Report Number(s): SAND-80-0608C; CONF-800418-2
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
ABSORPTION
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
HEATING
HIGH-FREQUENCY HEATING
INHOMOGENEOUS PLASMA
MAGNETIC MIRRORS
MICROWAVE RADIATION
OPEN PLASMA DEVICES
PLASMA
PLASMA DENSITY
PLASMA HEATING
RADIATIONS
RESONANCE ABSORPTION
THERMONUCLEAR DEVICES