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10 results on '"Tong, E"'

1. A field-deployed 810 GHz receiver incorporating a superconducting mixer developed for Herschel space telescope and a SiGe low noise amplifier

Author

Hedden, A., Li, H., Tong, E., Paine, S., Blundell, R., Kawamura, J., Groppi, C., Kulesa, C., Walker, C., de Lange, G., Mani, H., Weinreb, S., Hedden, A., Li, H., Tong, E., Paine, S., Blundell, R., Kawamura, J., Groppi, C., Kulesa, C., Walker, C., de Lange, G., Mani, H., and Weinreb, S.

Abstract

We have constructed an 810 GHz receiver system incorporating a HIFI Band-3 superconductor-insulator-superconductor (SIS) mixer developed for Herschel space observatory and a wide-band SiGe low noise amplifier (LNA) designed at Caltech. The instrument is currently installed at the RLT telescope (elevation 5500 m) in northern Chile. Hot/cold (280K/72K) load measurements performed at the telescope yield noise temperatures of 225 K (Y-factor = 1.7) including receiver optics. First-light observations indicate that the receiver is highly sensitive and functions stably. We present details of the receiver system, its performance at the telescope, and first-light observations with a Herschel mixer.

Published
2009

4. Large-Signal Frequency Response of an HEB Mixer: From 300 MHz to Terahertz.

Author

Lobanov, Y., Tong, E., Blundell, R., Hedden, A., Voronov, B., and Gol'tsman, G.

Subjects
*SUPERCONDUCTING magnets, *MICROWAVE devices, *OPTICAL waveguides, *HOT carriers, *DIGITAL signal processing, *BOLOMETERS, *BANDWIDTHS, *ELECTROMAGNETIC waves
Abstract

We present a study of the large signal frequency response of an HEB mixer over a wide frequency range. In our experiments, we have subjected the HEB mixer to incident electromagnetic radiation from 0.3 GHz to 1 THz. The mixer element is an NbN film deposited on crystalline quartz. The mixer chip is mounted in a waveguide cavity, coupled to free space with a diagonal horn. At microwave frequencies, electromagnetic radiation is applied through the coaxial bias port of the mixer block. At higher frequencies the input signal passes via the diagonal horn feed. At each frequency, the incident power is varied and a family of I-V curves is recorded. From the curves we identify 3 distinct regimes of operation of the mixer separated by the phonon relaxation frequency and the superconducting energy gap frequency observed at about 3 GHz and 660 GHz respectively. In this paper, we will present observed curves and discuss the results of our experiment. [ABSTRACT FROM AUTHOR]

Published
2011
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