A hot-electron direct detector for radioastronomy

Electron-Electron Bremsstrahlung in a Hot Plasma

Using the differential cross section for electron-electron (e-e) bremsstrahlung exact to lowestorder perturbation theory the bremsstrahlung spectra and the total rate of energy loss of a hot electron gas are calculated. The results are compared to the nonrelativistic and extreme-relativistic approximations available and to previous work. The e-e contribution to the bremsstrahlung emission of a ...

A C-band broadband ortho-mode transducer for radioastronomy polarimetry

BACKGROUND We describe the design, the construction and performance of a narrow band ortho-mode transducer, currently used in the 5 GHz polarimetric receiver of the Galactic Emission Mapping project. RESULTS The ortho-mode transducer was designed to achieve a high degree of transmission within the 400 MHz of the GEM band around the 5 GHz (4.8-5.2 GHz). It is composed of a circular-to-square w...

Fabrication and Properties of an Ultrafast NbN Hot-Electron Single-Photon Detector

34 LLE Review, Volume 85 Introduction Currently, visible photon counting is commonplace for advanced optical imaging and spectroscopy. Several types of devices, including photomultiplier tubes,1 quantum semiconductor avalanche photodiodes,2 and superconducting tunnel junctions,3 have been successfully implemented. In general, such detectors work by a cascade mechanism: an incident single photon...

A Backscatter Suppressed Electron Detector for the Measurement of “a”

A new method of measuring the electron-antineutrino angular correlation coefficient, little "a", from neutron decay-to be performed at the National Institute of Standards and Technology-will require an electron spectrometer that strongly suppresses backscattered electrons. A prototype consisting of six trapezoidal veto detectors arranged around a plastic scintillator has been tested with an ele...

Graphene Hot-electron Transistors