Electron heating in strongly beaded high-Z pinch discharges at high densities. Technical report

Technical Report · Fri May 01 00:00:00 EDT 1981

OSTI ID:5698800

Guillory, J

The late-time, fully-developed stage of sausage-like 'beading' of z-pinch discharges can give rise to enhanced electron heating (and thus enhanced radiative losses), caused by Ohmic anomalous heating in the constricted regions. In this report, this transfer of energy from condensations of magnetic field energy to radiation is examined quantitatively, based on a simplified dynamical model for the nonlinear instability driving terms. Constricted portions of the discharge, with low density and cross-section, and mostly or entirely anomalous current, alternate with the higher density beads, which carry current classically. The extreme limit of this phenomenon is that of multiple diodes in series, with the nearly-evacuated low density regions considered as bipolar-flow diodes, with pinched electron flow. In all probability, the low-density regions cannot evacuate to the extent required for such vacuum-diode behavior. The overall resistive heating rate is of course VI, with the total current I given by appropriate circuit equations, but the local heating rates for electrons in the low density regions are balanced by increased radiative loss when these hotter electrons collide with the denser blobs of plasma. The blobs cannot respond hydrodynamically to the increased heating before radiation loses the deposited energy.

• Research Organization: JAYCOR, Alexandria, VA (USA)
• OSTI ID: 5698800
• Report Number(s): AD-A-099719/7
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LINEAR Z PINCH DEVICES
PLASMA HEATING
ELECTRON TEMPERATURE
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
PINCH EFFECT
HEATING
LINEAR PINCH DEVICES
OPEN PLASMA DEVICES
PINCH DEVICES
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production