JCJC - Jeunes chercheuses & jeunes chercheurs

Superconducting COmponents for Cosmic microwave background ObservationS – COS^2

Submission summary

The characterisation of Cosmic Microwave Background (CMB) polarisation is one of the next challenges in observational cosmology. This is especially true for the so-called B-modes that are at least three orders of magnitude lower than CMB temperature fluctuations. A precise measurement of the angular power spectrum of these B-modes will give important constraints on inflation parameters. The objective of the international community, towards the year 2020, focuses on the preparation of a satellite dedicated to the B-mode measurements and the preliminary studies have shown that an important R&D effort to produce detector arrays and also novel advanced detection architectures. Furthermore, it appears that such advanced detection architectures will allow high quality observations through ground-based projects. This present project is intended to concentrate on the development of superconducting microwave devices required for the next instrument generations. These devices are essentially hybrid junctions, switches, and electromagnetic phase shifters. The experimental challenge that we are facing is the result of three constraints that are respectively, the requirement to operate a cryogenic temperatures, the weakness of the observed polarised signal measured that implies the use of an instrumentation not inducing any parasitic signal together with the use of a very large number of detectors. Within APC, our team is structured around a young lecturer specialised in instrumentation and presently vice 'Instrument Scientist' of the Planck- HFI satellite, one of the major program in observational cosmology, to be launched in 2008. Our team has at its disposal simulation software (Microwave Studion) and most of the characterisation tools to test the future realised samples (vector analyser and 300mK cryostat). Furthermore, in order to reach our objective, we would like to reinforce collaborations with a team from the LISIF (Université Pierre et Marie Curie) and LERMA (Observatoire de Paris) for their expertise in studies and realisation of radioastronomy componants as well as with IEF (Université Paris11), via its technological facility « Minerve », for their ability to produce high quality superconducting layers.

Project coordination

Michel PIAT (Organisme de recherche)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

Help of the ANR 150,000 euros
Beginning and duration of the scientific project: - 36 Months

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