Accession Number : AD0435677


Title :   FEASIBILITY DEMONSTRATION OF A NEW PLASMA DIAGNOSTIC PROBE.


Descriptive Note : Final rept., 1 Dec 62-30 Dec 63,


Corporate Author : GENERAL ELECTRIC CO SYRACUSE N Y


Personal Author(s) : Kingsland,D


Report Date : 27 Mar 1964


Pagination or Media Count : 57


Abstract : The purpose of this contract was to demonstrate the feasibility of utilizing the Thomson-scattered radiation of a ruby laser to determine electron temperature and density in a helium plasma. A thyratron tube was modified to create the plasma and a spectrometer was used to observe the Doppler profile of the Thomson-scattered radiation. Langmuir-type probes built into the modified thyratron were used as an independent check on electron density and temperature. There was little correlation between the laser scattering and the check provided by the Langmuir probes. A precise determination of electron temperature was not realized using the laser scattering data. An electron density of approximately 10 to the 15th power per cubic centimeter was, however, deduced from the magnitude of the scattered energy. Opposed to this was a value, approximately 6 x 10 to the 12th power per cubic centimeter, derived from the Langmuir probe data. Theoretical effort supports the laser scattering data and negates the validity of the Langmuir probe data. From this it is inferred that this diagnostic technique is sound even though the results do not completely demonstrate feasibility. (Author)


Descriptors :   *ELECTROMAGNETIC PROBES , *PLASMAS(PHYSICS) , ELECTROMAGNETIC PROBES , LASERS , RUBY , ELECTRONS , TEMPERATURE , DENSITY , HELIUM , EXPERIMENTAL DATA , THYRATRONS , SCATTERING , SPECTROPHOTOMETERS


Distribution Statement : APPROVED FOR PUBLIC RELEASE