Status of the Sardinia Radio Telescope project

Tofani, G.; Alvito, Gianni; Ambrosini, R.; Bolli, Pietro; Bortolotti, C.; Bruca, L.; Buffa, Franco; Cattani, A.; Comoretto, G.; Cremonini, A.; Cresci, Luca; D’Amico, N.; Deiana, Gian Luigi; Fara, A.; Feretti, L.; Fiocchi, F.; Flamini, Enrico; Pecci, F. Fusi; Grueff, G.; Maccaferri, G.; Maccaferri, A.; Mantovani, F.; Mariotti, Sergio; Migoni, Carlo; Messina, Filippo; Monari, Jader; Morsiani, M.; Murgia, M.; Musmeci, José; Nanni, M.; Natale, Vincenzo; Navarrini, A.; Negusini, M.; Nesti, R.; Olmi, L.; Orfei, A.; Orlati, A.; Palla, F.; Panella, D.; Pernechele, Claudio; Pilloni, S.; Pisanu, T.; Poddighe, A.; Poloni, M.; Poma, A.; Poppi, S.; Porceddu, I.; Prandoni, I.; Roda, J.; Roma, Mauro; Sarti, Pierguido; Scalambra, A.; Schillirò, F.; Tarchi, A.; Vargiu, G.; Zacchiroli, G.

doi:10.1117/12.790503

Cited by 23 publications

(13 citation statements)

References 7 publications

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“…A matched pair of spiral filters with a pass band of 305-410 MHz were designed for one of the receivers in the Sardinia Radio Telescope (SRT, www.srt.inaf.it), a new general purpose, fully steerable 64 m diameter parabolic radio telescope [2,11]. The telescope operates with high efficiency in the 0.3-116 GHz frequency range.…”

Section: Introductionmentioning

confidence: 99%

Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

Bolli

Huang

2012

Exp Astron

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A matched pair of microstrip spiral superconducting filters with centre frequency 357.5 MHz and 29.4% bandwidth has been developed for radio astronomy. The high coupling coefficients required for the large bandwidth have been achieved through interdigitating the spirals to provide a large interaction length, and by adding loading capacitors on the inner ends of the resonators, together with previously reported features. A low-pass filter has been cascaded with each band-pass filter to mitigate spurious responses. Measurements show 0.09 dB loss, thought to arise mainly from sources outside the filter itself, plus 0.12 dB maximum ripple.

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Section: Introductionmentioning

confidence: 99%

Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

Bolli

Huang

2012

Exp Astron

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“…The Sardinia Radio Telescope (SRT, www.srt.inaf.it) [1][2] project aims to construct a general purpose, fully steerable 64-m diameter radio telescope capable of operating whit high efficiency from 300 MHz up to 115 GHz (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

The dual-band LP feed system for the Sardinia Radio Telescope prime focus

et al. 2010

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We present the design of the passive feed system of the dual-band receiver for the prime focus of the Sardinia Radio Telescope (SRT), a new 64 m diameter radio telescope which is being built in Sardinia, Italy. The feed system operates simultaneously in P-band (305-410 MHz) and L-band (1300-1800 MHz). The room temperature illuminators are arranged in coaxial configuration with an inner circular waveguide for L-band (diameter of 19 cm) and an outer coaxial waveguide for P-band (diameter of 65 cm). Choke flanges are used outside the coaxial section to improve the crosspolarization performance and the back scattering of the P-band feed. The geometry was optimized for compactness and high antenna efficiency in both bands using commercial electromagnetic simulators. Four probes arranged in symmetrical configuration are used in both the P and the L-band feeds to extract dual-linearly polarized signals and to combine them, through phased-matched coaxial cables, into 180 deg hybrid couplers. A vacuum vessel encloses the two P-band hybrids and the two L-band hybrids which are cooled, respectively at 15 K and 77 K. For the P-Band, four low loss coaxial feedthroughs are used to cross the vacuum vessel, while for the L-Band a very low loss large window is employed. The P-band hybrids are based on a microstrip rat-race design with fractal geometry. The L-band hybrids are based on an innovative double-ridged waveguide design that also integrates a band-pass filter for Radio Frequency Interference (RFI) mitigation.

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“…The instrument, that is now facing the technical commissioning phase, is the result of a scientific and technical collaboration among three structures of the Italian National Institute for Astrophysics (INAF). 1 The main antenna geometry is a shaped reflector system pair, based on the classical Gregorian configuration. The primary mirror (M1) consists of 1008 panels supported by 1116 electro-mechanical actuators, whose extension is properly controlled in order to observe up to 100 GHz.…”

Section: Introductionmentioning

confidence: 99%

Diving into the Sardinia Radio Telescope minor servo system

et al. 2012

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The Sardinia Radio Telescope (SRT) is a new 64-metre, Gregorian-shaped antenna built in Sardinia (Italy). It\ud is designed to carry out observations up to 100 GHz.\ud The telescope is provided with six focal positions: primary, Gregorian and four beam-waveguide foci. This\ud paper describes the project of the servo system which allows the focus and receiver selection during the instrument\ud setup. This system also operates, at the observation stage, the compensation of some of the stucture deformations\ud due to gravity, temperature variations and other environmental effects.\ud We illustrate the system features following a bottom-up approach, analysing all the project layers ranging\ud from low-level systems, as the hardware controls, to the design and implementation of high-level software, which\ud is based on the distributed objects ACS (ALMA Common Software) framework.\ud Particular focus will be put on the links among the hierarchical levels of the system, and on the solutions\ud adopted in order to guarantee that the control of the servo system is abstracted from the underlying hardware

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Status of the Sardinia Radio Telescope project

Cited by 23 publications

References 7 publications

Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

Superconducting filter for radio astronomy using interdigitated, capacitively loaded spirals

The dual-band LP feed system for the Sardinia Radio Telescope prime focus

Diving into the Sardinia Radio Telescope minor servo system

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