Higgins, Ronan D. and Kooi, Jacob W. (2009) Electrical standing waves in the HIFI HEB mixer amplifier chain. In: Terahertz Technology and Applications II. Proceedings of SPIE. No.7215. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 72150L. ISBN 9780819474612. https://resolver.caltech.edu/CaltechAUTHORS:20190516-133050681
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Abstract
The Heterodyne Instrument for the Far-Infrared (HIFI) is one of three instruments to be launched aboard the Herschel Space Observatory (HSO) in 2009. HIFI will provide unprecedented spectral sensitivity and resolution between 490-1250 GHz and 1410-1910 GHz. In this paper, we report on the analysis of electrical standing waves that are present between the hot electron bolometer (HEB) heterodyne mixing element and the first low noise amplifier in the HIFI instrument. We show that the standing wave shape is not a standard sinusoid and difficult to remove from the resulting spectrum using standard fitting methods. We present a method to remove the standing waves based on data taken during the HIFI instrument level test, and anticipate the use of a similar calibration procedure in actual flight. Using the standing wave profile we obtain direct evidence of the complex IF output impedance of the HEB mixer.
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| Additional Information: | © 2009 Society of Photo-Optical Instrumentation Engineers (SPIE). The authors thank the gas cell team for providing the data presented in this paper and Bertrand Delforge for generating the gascell database and the tools to access it. Additionally the authors thank David Teyssier, Pourya Khosropanah, Willem Jellema, Gert de Lange and Pieter Dieleman for their insights about HIFI and the HEB IF chain. The authors would like to acknowledge the support of Enterprise Ireland (Prodex). | ||||||
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| Subject Keywords: | HIFI, Herschel, HEB mixer, standing wave, impedance | ||||||
| Series Name: | Proceedings of SPIE | ||||||
| Issue or Number: | 7215 | ||||||
| Record Number: | CaltechAUTHORS:20190516-133050681 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190516-133050681 | ||||||
| Official Citation: | Ronan D. Higgins and Jacob W. Kooi "Electrical standing waves in the HIFI HEB mixer amplifier chain", Proc. SPIE 7215, Terahertz Technology and Applications II, 72150L (10 February 2009); doi: 10.1117/12.811127; https://doi.org/10.1117/12.811127 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 95545 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Tony Diaz | ||||||
| Deposited On: | 16 May 2019 22:05 | ||||||
| Last Modified: | 09 Mar 2020 13:18 |
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