Sardinia Radio Telescope
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1 Sardinia Radio Telescope Current status and future developments Carlo INAF - OAC
2 Funded by: Italian Ministry of Education and Scientific Research (MIUR) Sardinia Regional Government (RAS) Italian Space Agency (ASI) National Council of Researches (CNR) National Institute for Astrophysics (INAF)
3 Observing modes -) single-dish (continuum, full Stokes and spectroscopy) -) Very Long Baseline Interferometry (VLBI) -) Space Science
4 Six focal positions: primary gregorian four beam-waveguide Active Surface: 1008 panels moved by 1116 electro-mechanical actuators able to correct the deformations induced by the gravity on the primary surface and to reshape it from a shaped (parabola-ellipse) to a parabolic profile Frequencies: from 300 Mhz to 100 Ghz Receivers: possible up to 14
5 Position Pranu Sanguni,San Basilio, Sardinia Coordinates Lat 39 29' " N, Long 9 14' " E Optical Configuration Gregorian + Beam Waveguide (BWG) Primary mirror diameter 64 m Subreflector diameter 8m Focal positions primary f/d= 0.33 gregorian f/d=2.34 beam waveguide (BWG) f/d=1.8 Azimuth range Elevation range 5 90 Slew rate 0.85 /s azimuth 0.5 /s elevation
6 Receivers - Current status RX Freq range [GHz] P-L band coaxial feed Focal position Antenna gain (K/Jy) Tsys (EL=90 ) Primary C-band (high) mono-feed BWG 0.61 (LCP) 0.60 (RCP) 27 (LCP) 25 (RCP) K-band multi-feed Gregorian 0.66 (LCP) 0.65 (RCP) 74 (LCP) 77 (RCP)
7 Receivers Future developments Freq range [GHz] Focal position Antenna gain (K/Jy) Tsys (K) Primary BWG Q-band multi-feed Gregorian W-band mono-feed Gregorian RX S-band multi-feed C-band (low) mono-feed
8 Backends Current status Integration time Max spectral channels Min spectral resolution (Hz) Backend Usage Inputs Max input IF band (GHz) Total Power Continuum ms Digital Filter Backend (DFB) Pulsar (timing & search) ms 4 s XARCOS Spectropolarimetry s ROACH Pulsar (LEAP project) s
9 Backends Current status Backend Usage Inputs Max input IF band (GHz) SARDARA (ROACH2) Continuum - Polarimetry - Spectropolarimetry - Wide and Narrow band spectroscopy - Pulsar - Fast Radio Bursts - Search for ExtraTerrestrial Intelligence Integration time Max spectral channels Min spectral resolution (Hz) 5 ms
10 DISCOS Development of the Italian Single-dish COntrol System Common infrastructure to the three Italian radio telescopes Based on the Alma Common Software (ACS) framework More than 500k lines of code (C++, Python) NURAGHE (SRT), ESCS (Medicina, Noto)
11 DISCOS Main Servo System (AZ, EL) Minor Servo System (SRP, GFR, PFP) M1 Active Surface Frontends Backends Data acquisition Metrology and services External applications (i.e. VLBI) Graphical User Interface
12 DISCOS
13 SRT & VLBI: past, present HW: DBBC2-Fila10G-MARK5C DBBC2-MARK5B+ SW: FIELD SYSTEM (in the SRT implementation controls directly the DBBC and the Mark5C while controls LO and rx calibration marks via NURAGHE)
14 SRT & VLBI: past, present 2013: first test (hw and sw setup, FS procedure optimization, etc) 2014: first fringes during an I-VLBI test (Jan) 2014: first fringes at L-band and K-band during the first EVN session (feb) 2014: first fringes at C-band during the second EVN session (jun) 2014: first RADIOASTRON experiments
15 SRT & VLBI: past, present 2014: Technical and Operational Group meeting in Cagliari (Oct) 2015: Officialy into EVN network, SRT joins most of all the experiments at the three its available bands 2015: Officially into RadioAstron network 2016: experiments and tests with - Korean VLBI Network (KVN) - Japanese VLBI Network (VERA) - Chinese Tianma 65-m radiotelescope
16 SRT: future 2017 Stop of all the activities until the end of August for an urgent repair of all the actuators of the Active Surface System due to an unexpected phenomenon of breaking and corrosion of some parts of the actuators
17 SRT: future
18 SRT: future 2017 Migration of control room, equipment and offices to the new buildings room
19 SRT: future
20 SRT: future Activities will restart on September ) new technical commissioning (sep-dec 2017) 2) new scientific commissioning (jan-jun 2018) 3) new early science program (jul-dec 2018)
21 SRT: future Full SRT operations are expected to resume in 2019
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