Accession Number : AD0459608


Title :   LO-TEMP THERMIONIC PLASMA STUDY.


Descriptive Note : Annual rept. for 1964,


Corporate Author : SPERRY RAND CORP LONG ISLAND CITY NY FORD INSTRUMENT DIV


Personal Author(s) : Haring, L L


Report Date : Dec 1964


Pagination or Media Count : 1


Abstract : The effort during this period has been directed toward understanding the collector phenomena in an operating dispenser emitter converter, and through this obtaining a compatible low work function collector. Using a sequence of single cylindrical diodes, the effect of processing variables on collector performance was evaluated. The control of the rate of dispenser emitter evaporation by vacuum pre-aging techniques was found to be the most significant factor in providing a surface of suitable work function and electrical conductivity. In addition, a cylindrical multiple collector comparator diode developed under the program provided for substrate comparison and dynamic evaluation of the collector work function during early life. The experimental data generated by both diode types leads to the conclusion that the collector is one of an 'n' type semiconductor consisting of a constantly replenished layer of barium oxide doped with barium. This surface has a measured work function (1.4 ev) which is definitely lower than the normal families of cesium covered refractory metals. Consequently, this is one of the significant contributing factors in generating the superior performance of these diodes in the low and moderate temperature ranges. (Author)


Descriptors :   *THERMIONIC CONVERTERS , FEASIBILITY STUDIES , CYLINDRICAL BODIES , SEMICONDUCTOR DIODES , MOLYBDENUM , CASTINGS , VAPOR PLATING , NICKEL , RHENIUM , CERMETS , CESIUM , LIQUID METALS , BARIUM , BARIUM COMPOUNDS , OXIDES , COATINGS , ENERGY , ELECTRIC POWER PRODUCTION


Distribution Statement : APPROVED FOR PUBLIC RELEASE