Accession Number : AD0455124


Title :   RESEARCH STUDIES OF QUANTUM DETECTORS AND MIXERS.


Descriptive Note : Final rept., 1 Jul 62-30 Aug 64,


Corporate Author : RADIO CORP OF AMERICA HARRISON NJ


Personal Author(s) : Blattner, D ; Ruedy, J


Report Date : 30 Aug 1964


Pagination or Media Count : 74


Abstract : Photomultiplier tubes capable of extending the low-noise gain of secondary emission multiplication to microwave frequencies were designed and operated. The tubes consisted of a semitransparent photocathode sensitive to the required spectral region, a multi-stage structure of transmission secondary emission dynodes, and a helical output coupler through which the electrons from the last dynode are focused. Experimental results are reported for tubes having a center frequency of 1.5 Gc and a bandwidth of 1.0 Gc. Tests indicate that any deterioration of modulation by the secondary emission multiplication process is small compared to the gain achieved in the dynodes. The noise is that predicted from the statistics of photo- and secondary-emission. For light wavelengths where efficient photocathodes can be constructed, the sensitivity of this tube approaches that of an ideal detector. Calculations indicate that scaling of this tube design to frequencies as high as K sub a band is possible. (Author)


Descriptors :   *PHOTOTUBES , ARMY RESEARCH , PHOTOMULTIPLIER TUBES , PHOTOCATHODES , SECONDARY EMISSION , MICROWAVE FREQUENCY , DETECTORS , K BAND , BROADBAND , BANDWIDTH , SEMICONDUCTOR DIODES , QUANTUM THEORY , SENSITIVITY , POTASSIUM COMPOUNDS , CHLORIDES , MAGNESIUM COMPOUNDS , OXIDES


Distribution Statement : APPROVED FOR PUBLIC RELEASE