Istituto Nazionale di Astrofisica Sardinia Radio Telescope Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze Status attuale e prospettive future del Sardinia Radio Telescope (SRT) A. Navarrini a nome del team SRT INAF (Istituto Nazionale di Astrofisica) Osservatorio Astronomico di Cagliari
21
Embed
Status attuale e prospettive future del Sardinia Radio ... · Status attuale e prospettive future del Sardinia Radio Telescope (SRT) ... •INAF Arcetri Astrophysical Observatory,
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
Status attuale e prospettive future del
Sardinia Radio Telescope (SRT)
A. Navarrini a nome del team SRT
INAF (Istituto Nazionale di Astrofisica)
Osservatorio Astronomico di Cagliari
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
SRT Project
Collaboration among three Research Structures of INAF:
• INAF Astronomical Observatory of Cagliari, Cagliari
• MIUR (Italian Ministry of Education and Scientific Research)
• ASI (Italian Space Agency)
• RAS (Sardinia Regional Government)
Cost 60 MEuro
64 m diameter fully steerable radiotelescope to cover 0.3-116 GHz:- Single dish operation
- Part of VLBI network
- Radioastronomy, geodynamical studies, Deep Space Network
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
SRT site
Altitude a.s.l. ≈600 m
Latitude +390 29m 50s
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
SRT technical specificationsPrimary mirror D=64 m; Secondary mirror D=7.9 m
Gregorian configuration with shaped surfaces
Six focal positions: Primary,
Gregorian, & four Beam Wave Guide
Primary surf. accuracy:150 m RMS
Frequency agility
Pointing accuracy (RMS): 2 ÷ 5 arcsec
Can host up to 20 dual polarization
receivers: mono feed, dual frequency,
multibeam, phased array feeds
0.3-116 GHz frequency coverage
Active Surface: Primary mirror adjustable with 1116 actuators to compensate gravitational
deformation of the BKS; also used to convert shaped surface to parabolic for primary focus
operation
Optical Configuration and Ray Tracing of SRT
Primary Focus
F1/D =0.33
300MHz < f < 20GHz
Beam Wave Guide Foci
F3/D=1.37
F4/D = 2.81 (not shown)
1.4GHz < f < 35GHz
Gregorian Focus
F2/D =2.35
7.5GHz < f < 116GHz
Active surface: shape of primary mirror controlled with actuators
Compensate deformations of the primary mirror Convert shaped profile to a true-parabola (for primary focus) Compensate deformations of the secondary mirror
Active surface: the actuators
0.015mm/30mm
0.36mm/s
Weight: 12kg
-10° +60oC
Active surface: the actuators
actuators
1116 actuators
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
Six-month Early Science Program completed by Aug. 2016
12 large programs allocated for a total
of ≈2000 hours observing time
Front-EndFreq. range
[GHz]
Focal
position,
F/D
N. Pixels
× pols
Measured/
Expected*
receiv. noise
temp. [K]
Status
L- and P- band
coaxial feed
P: 0.305-0.410 Primary
0.33
1 × 2 17-22 Commissioned
L: 1.3-1.8 1 × 2 10-13 Commissioned
High C-band 5.7-7.7BWG I
1.371 × 2 6.5-9 Commissioned
K-band 18-26.5Gregorian
2.357 × 2 20-40 Commissioned
S-band 3.0-4.5Primary
0.337 × 2 15*
Under
construction
Low C-band 4.2-5.6BWG II
2.811 × 2 8*
Under
construction
Q-band 33-50Gregorian
2.3519 × 2 25*
Under
construction
W-band 84-116Gregorian
2.351 × 1 30-45
Under
construction
X-band (ASI) 8.2-8.6BWG II
2.811 × 2 15 Commissioned
SRT Front-Ends built and under construction at INAF
Commissioned SRT Front-Ends developed by INAFL-P band coaxial feed
P: 305-410 MHz
L: 1.3-1.8 GHz
K-band multibeam18-26.5 GHz
High-C-band monofeed5.7-7.7 GHz
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
Front-Ends installed at the SRT primary focus
L-P band
receiver
Holographic
receiver
(11 GHz)
X-Ka band
receiver
7.9 m diameter
secondary mirror
S band 7-beam receiver forthcoming
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
High-C band, installedLow-C-Band,
forthcoming
Movable
M3
K band multibeam,
installedSecondary focus
positioner
(rotating turrett)
Front-Ends at the Gregorian and BeamWaveGuide (BWG) foci
Q band & 3 mm band,
forthcoming
Secondary
focus
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
K-band multibeam receiver installed on SRT
July 2012
Istituto Nazionale di Astrofisica Sardinia Radio Telescope
Super-risoluzione in Radioastronomia, 12 Ottobre 2017, Villa Galileo, Firenze
SRT backends
• DFB (Digital Filter Bank): 1 GHz BW full-Stokes; up to 2048 ch.,