http://www.cnr.it/ontology/cnr/individuo/prodotto/ID175413
The PLANCK-LFI flight model composite waveguide (Articolo in rivista)
- Type
- Label
- The PLANCK-LFI flight model composite waveguide (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1088/1748-0221/4/12/T12007 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- O. D'Arcangelo; L. Figini; A. Simonetto; F. Villa; M. Pecora; P. Battaglia; M. Bersanelli; R. C. Butler; F. Cuttaia; S. Garavaglia; P. Guzzi; N. Mandolesi; A. Mennella; G. Morgante; L. Pagan and L. Valenziano (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
- http://iopscience.iop.org/1748-0221/4/12/T12007/ (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Fisica del Plasma - CNR,
via Cozzi 53, 20125 Milano, Italy
Istituto di Astrofisica Spaziale e Fisica Cosmica, INAF,
via P. Gobetti, 101, I40129 Bologna, Italy
Thales Alenia Space Italia,
S.S. Padana Superiore 290, 20090 Vimodrone (MI), Italy
Universitá degli Studi di Milano,
Via Celoria 16, 20133 Milano, Italy (literal)
- Titolo
- The PLANCK-LFI flight model composite waveguide (literal)
- Abstract
- The Low Frequency Instrument on board the PLANCK satellite is designed to give
the most accurate map ever of the CMB anisotropy of the whole sky over a broad frequency band
spanning 27 to 77GHz. It is made of an array of 22 pseudo-correlation radiometers, composed
of 11 actively cooled (20K) Front End Modules (FEMs), and 11 Back End Modules (BEMs) at
300K, each FEM and BEM set comprising two radiometers. The connection between the two parts
is made with rectangular Wave Guides (WGs). Considerations of very different nature (thermal,
electromagnetic and mechanical), imposed stringent requirements on the WGs characteristics and
drove their design. From the thermal point of view, the WG should guarantee good insulation beetween
the FEM and the BEM sections to avoid overloading the cryocooler. On the other hand it
is essential that the signals do not undergo excessive attenuation through the WG. Finally, given
the different positions of the FEM modules behind the focal surface and the mechanical constraints
given by the surrounding structures, different mechanical designs were necessary. A composite
configuration of Stainless Steel and Copper was selected to satisfy all the requirements described.
Given the complex shape and the considerable length (about 1.5-2m) of the LFI WGs, manufac-
turing and testing the WGs was a challenge. This work deals with the development of the LFIWGs, including the choice of the final configuration and of the fabrication process. It also describes the testing procedure adopted to fully characterize these components from the electromagnetic point of view and the space qualification
process they underwent.
The Scattering parameters of the WGs were obtained in a one port configuration, minimizing
instrumental errors. The space qualification process required manufacturing ad-hoc facilities to
support the WGs during vibration tests and to allow electromagnetic tests without removing them.
Results obtained during the test campaign are reported and compared with the stringent requirements.
The performance of the LFI WGs is in line with requirements, and the WGs were successfully
space qualified. (literal)
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