Assessing the value of trees in sustainable grazing systems (2008)
McKeon, G. M., Chilcott, C., McGrath, W., Paton, C., Fraser, G., Stone, G. S., ...
Antenna-coupled superconducting hot-electron detectors (2004)
LeDuc, H., Kawamura, J., Harding, D., McGrath, W., Jun, T., Karasik, B.
Novel multiplexing technique for detector and mixer arrays (2004)
Future space submillimeter telescopes will require large-format imaging detector arrays to perform state-of-the-art astronomical observations. A crucial issue related to a focal plane array is a...
A Submillimeter Wave SIS Receiver for 547 GHz (2004)
McGrath, W., Febvre, P., Javadi, H., Salez, M., Batelaan, P., Frerking, M.
The most sensitive heterodyne receivers used for millimeter wave and submillimeter wave radioastronomy employ superconductor-insulator-superconductor tunnel junctions as the nonlinear mixing element.
A 547 GHz SIS Receiver Employing a Submicron Nb Junction with an Integrated Matching Circuit (2004)
Febvre, P., McGrath, W., Leduc, H., Batelaan, P., Frerking, M., Hernichel, J., ...
The most sensitive heterodyne receivers used for millimeter wave and submillimeter wave radioastronomy employ superconductor-insulator-superconductor (SIS) tunnel junctions as the nonlinear mixing...
Febvre, P., McGrath, W., Batelaan, P., LeDuc, H., Bumble, B., Frerking, M., ...
This paper describes a receiver for radioastronomy applications in the 460 ??0-GHz range.
Salez, M., McGrath, W., Febvre, P., Bumble, B., LeDuc, H.
So far, the most sensitive heterodyne receivers in the millimeter-wave and submillimeter-wave frequency ranges have used the mixing response of the quasiparticle currents in SIS tunnel junctions.
A Novel Noncontacting Waveguide Backshort for Submillimeter Wave Frequencies (2004)
A novel noncontacting waveguide backshort has been developed which provides excellent performance. It consists of a metallic bar with rectangular or circular holes. It has the advantage of being...
Low-noise and Wideband Hot-Electron Superconductive Mixers for THz Frequencies (2004)
Karasik, B., Skalare, A., Wyss, R., McGrath, W., Bumble, B., LeDuc, H., ...
Superconductive hot-electron bolometer (HEB) mixers have been built and tested in the frequency range from 1.1 THz to 2.5 THz.
Photon-Noise Limited Direct Detector Based on Disorder-Controlled Electron Heating (2004)
Karasik, B., McGrath, W., Gershenson, M., Sergeev, A.
We present a new concept for a hot-electron direct detector (HEDD) capable of counting single millimeter-wave photons. The detector is based on a transition edge sensor (1-meu size bridge) made form...
Low-Noise and Wideband Hot-Electron Superconductive Mixers at THz Frequencies (2004)
Karasik, B., Skalare, A., McGrath, W., Bumble, B., LeDuc, H., Barner, J., ...
Submillimeter-wave Spectral Response of Twin Slot Antennas Coupled to Hot Electron Bolometers (2004)
Wyss, R., Neto, A., McGrath, W., Bumble, B., LeDuc, H.
In this study we have measured mixers with a wide range of twin-slot antennas with slot lengths ranging from 26 meu up to 152 meu.
Diffusion-Cooled Aluminum Hot-Electron Bolometer Mixers at Submillimeter Wavelengths (2004)
Skalare, A., McGrath, W., Echternach, P., LeDuc, H.
We report on the first mixing experiments at submillimeter wavelengths with superconducting diffusion-cooled hot-electron bolometers (HEB's) made from aluminum.
Sub-Micron Long HTS Hot-Electron Mixers (2004)
Harnack, O., Karasik, B., McGrath, W., Kleinsasser, A., Barner, J.
Frequency-Domain Analysis of Diffusion-Cooled Hot-Electron Bolometer Mixers (2004)
Skalare, A., McGrath, W., Bumble, B., LeDuc, H.
A new theoretical model is introduced to describe heterodyne mixer conversion efficiency and noise (from thermal fluctuation effects) in diffusion-cooled superconducting hot-electron bolometers.
Wyss, R., Karasik, B., McGrath, W., Bumble, B., LeDuc, H.
Diffusion-cooled Nb hot-electron bolometer (HEB) mixers have the potential to simultaneously achieve high intermediate frequency (IF) bandwidths and low mixer noise temperatures for operation at THz...
Microwave Mixing and IF Bandwidth In Sub-Micron Long High-T***subc*** Hot-Electron Bolometers (2004)
Harnack, O., Karasik, B., McGrath, W., Kleinsasser, A., Barner, J.
We have systematically measured both the length and temperature dependence of the intermediate frequency (IF) bandwidth of hot-electron bolometer (HEB) mixer made form a high-T***subc***...
Submicron-Long HTS Hot-Electron Mixers (2004)
Harnack, O., Karasik, B., McGrath, W., Kleinsasser, A., Barner, J.
We have measured the device length and temperature dependence of the intermediate frequency (IF) bandwidth and noise of hot-electron bolometert (HEB) mixers made from a high-T***subc***...
1.8 THz superconductive hot-electron bolometer mixer for Herschel (2004)
Kawamura, J. H., Harding, D., McGrath, W., Bumble, B., LeDuc, R., Focardi, P.
Tantalum hot-electron bolometers for low-noise heterodyne receivers (2004)
Skalare, A., McGrath, W., Bumble, B., LeDuc, H. G.
We describe superconducting diffusion-cooled hot-electron bolometers that were fabricated fromtantalum films grown on a thin niobium seed layer. The seed layer promotes single-phase growth of the Ta...
Febvre, P., Leridon, B., Maoli, R., George, S., Feautrier, P., Ruffié, G., ...
Some specific features of series arrays of superconducting junctions used as mixing elements in radioastronomical spectroscopy are analysed. The influence of the area and insulating barrier...
Febvre, P., Leridon, B., Maoli, R., George, S., Feautrier, P., Ruffié, G., ...
Some specific features of series arrays of superconducting junctions used as mixing elements in radioastronomical spectroscopy are analysed. The influence of the area and insulating barrier...
Febvre, P., Leridon, B., Maoli, R., George, S., Feautrier, P., Ruffié, G., ...
Some specific features of series arrays of superconducting junctions used as mixing elements in radioastronomical spectroscopy are analysed. The influence of the area and insulating barrier...