Accession Number:
AD0712281
Title:
PULSED LANGMUIR PROBE MEASUREMENT OF IONIZATION IN A HIGH-PRESSURE PLASMA,
Descriptive Note:
Corporate Author:
VICTORIA UNIV (BRITISH COLUMBIA) DEPT OF PHYSICS
Personal Author(s):
Report Date:
1970-03-16
Pagination or Media Count:
5.0
Abstract:
Measurements with a negatively pulsed probe in an atmospheric-pressure high-density plasma over wide ranges of ionization density 10 to the 15th power to 10 to the 18th powercubic meters, probe voltage 10-400 volts, and flow velocity 5-40 ms have confirmed previous results obtained by Thomas, working at a single voltage and flow velocity in which the current initially falls off with 1t to the y power dependence where y approximately 0.58 and t time. The results together with those of Thomas show good agreement with a theory based on a physical model involving space-charge controlled expansion of the sheath towards its final position. It is expected that this technique of probe operation will afford a simple and sometimes unique method of measuring ionization density with excellent spatial resolution, under high-pressure conditions where the plasma velocity relative to the probe is not accurately known for atmospheric-pressure dc measurements this factor often becomes significant with flow velocities 0.1-1ms. Author
Descriptors:
Subject Categories:
- Test Facilities, Equipment and Methods
- Plasma Physics and Magnetohydrodynamics