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Author
Edward Tong, C.-Y.
;
Loudkov, Denis N.
;
Paine, Scott N.
;
Marrone, Dan P.
;
Blundell, Raymond
Title
Vector measurement of the beam pattern of a 1.5 THz superconducting HEB receiver
Type
Conference Article
Year
2005
Publication
Proc. 16
th
Int. Symp. Space Terahertz Technol.
Abbreviated Journal
Proc. 16
th
Int. Symp. Space Terahertz Technol.
Volume
Issue
Pages
453-456
Keywords
NbTiN HEB mixers
Abstract
Near-field vector beam pattern of the 1.5 THz superconducting Hot Electron Bolometer (HEB) receiver currently in operation in Northern Chile has been performed in our laboratory. Using an open waveguide probe, we have mapped both the amplitude and phase of the beam emerging from our 1.5 THz HEB receiver package, across a number of planes along the line of propagation of the radio-beam. With an integration time of about 100 ms per point, a signal-to-noise ratio of about 25 dB was achieved for a beam waist of 3.5 mm. These measurements have proved to be invaluable in achieving good alignment between the cryostat housing the HEB mixer and the remainder of the receiver and telescope optics. The accuracy of our beam measurement is estimated to be ±0.2 mm in position and ±5 arc minutes in angular displacement.
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no
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1474
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