EMBRACE@Nançay: an ultra wide field of view prototype for the SKA

Torchinsky, S.; Olofsson, A. O. H.; Censier, B.; Karastergiou, A.; Serylak, M.; Renaud, Patrice; Taffoureau, C.

doi:10.1088/1748-0221/10/07/c07002

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Appropriate antenna arrays were developed as design studies for the Square Kilometre Array (SKA). The EMBRACE test array (Torchinsky et al 2015(Torchinsky et al , 2016 is an 8 × 8 m array consisting of 4600 dual-polarisation (only one fully equipped) elements for the frequency range between 900-1500 MHz. The original analogue beamformer cannot directly be used for the FFT-based beamformer design, but we are considering options to combine the existing array or a variant of it with a CHIME-like beamformer as a first step in the direction of a sensitive wide-field FRB search instrument.…”

Section: Finding Lensed Frbsmentioning

confidence: 99%

Cosmology with gravitationally lensed repeating fast radio bursts

Wucknitz

Spitler

Pen

2021

A&A

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High-precision cosmological probes have revealed a small but significant tension between the parameters measured with different techniques, among which there is one based on time delays in gravitational lenses. We discuss a new way of using time delays for cosmology, taking advantage of the extreme precision expected for lensed fast radio bursts, which are short flashes of radio emission originating at cosmological distances. With coherent methods, the achievable precision is sufficient for measuring how time delays change over the months and years, which can also be interpreted as differential redshifts between the images. It turns out that uncertainties arising from the unknown mass distribution of gravitational lenses can be eliminated by combining time delays with their time derivatives. Other effects, most importantly relative proper motions, can be measured accurately and disentangled from the cosmological effects. With a mock sample of simulated lenses, we show that it may be possible to attain strong constraints on cosmological parameters. Finally, the lensed images can be used as galactic interferometer to resolve structures and motions of the burst sources with incredibly high resolution and help reveal their physical nature, which is currently unknown.

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Section: Finding Lensed Frbsmentioning

confidence: 99%

Cosmology with gravitationally lensed repeating fast radio bursts

Wucknitz

Spitler

Pen

2021

A&A

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“…EMBRACE at Nançay has been fully operational since 2011. Characterization of the 70.8 m 2 dense array at Nançay is reported in [34,35]. APERTIF, a focal plane array instrument, currently being commissioned, uses 12 dishes of the Westerbork Synthesis Radio Telescope [36].…”

Section: Tapered Slot Antennamentioning

confidence: 99%

On the front-end design of mid-frequency aperture array for square kilometre array

et al. 2018

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Complementary to the conventional dish radio telescopes, aperture arrays provide a technically attractive approach to achieve a large field of view and flexibility in observational parameters e.g. Sky area vs. bandwidth. Designs of both aperture array elements and overall geometry for the SKA Mid Frequency Aperture Array are presented here, together with resulting trade-offs. The paper reports the latest developments of global efforts on the front-end design of Mid-Frequency Aperture Array, not attempting to make technology selections, as the priority of sciences and the time for implementing Mid-Frequency Aperture Array is yet to be fully confirmed. Different ongoing front-end solutions are introduced, particularly crossed ring antenna array with a planar structure is explored in more detail as it is less known in the community. Key performances of the candidate front-end technologies are addressed by examining the prototypes. The objective of the collaborative study is to increase technology readiness for implementation of Mid-Frequency Aperture Array in the future.

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“…The two EMBRACE stations began with an initial period of engineering testing on the partially complete arrays (Olofsson et al 2009;Wijnholds et al 2009). EMBRACE@Nançay has been fully operational since 2011 and now performs regularly scheduled astronomical observations, such as pulsar observations and extragalactic spectral line observing (Torchinsky et al 2013(Torchinsky et al , 2015. EM-BRACE system characteristics, such as beam main lobe and system temperature, are behaving as expected.…”

Section: Introductionmentioning

confidence: 99%