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ACS in the SRT project

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  1. ACS in the SRT project Giuseppe Maccaferri Andrea Orlati INAF – IRA, ITALIA

  2. Institute for Radio Astronomy (IRA) • From 2005 is part of National Institute for Astrophysics (INAF) • About 100 employers, astronomers, engineers and technicians • A Bologna headquarters, and four departments, Medicina, Arcetri(Florence), Noto(Sicily) and Cagliari(Sardinia) • Three telescope; “Northern Cross” old 408Mhz 600X600m, and 2x32m paraboloids • A new 64m paraboloid in construction in Sardinia (SRT, Sardinia RadioTelescope)

  3. SRT • New 64m Gregorian telescope operating from 0.3 to 100GHz • Three available foci: primary, Gregorian and bwg (beam-wave guide) with receivers automatic configuration • Active surface • Metrology sensors for temp. deformation, secondary mirror migrations, wind • Pointing precision: 1 arcsec • Expected gain @ 30GHz: 0.635K/Jy

  4. Equipped hardware • 1116 active surface actuators • 7 axis subreflector • 3 axis primary focus positioner • Multireceivers gregorian rotating drum • Rotating mirror for bwg 4-foci selection • 18 cryogenic receivers, with one of multi-beams type

  5. Working status • The foundation is almost finished • Before 2006 will start the antenna erection • The 1116 actuators are ready for the end of 2005 • The receivers are in construction • The first light is foreseen for first quarter of 2008 9 September 2005

  6. ACS for SRT • strong & reliable software framework to monitor and control all the antenna devices • User’s contribute area for software exchanging • Remotely controllable • Notification channels • Events and alarm logging system • Load balancing and failure tolerance features • Platform and license free system • Emerging standard in radiotelescope control

  7. ACS used to control: • the telescope pointing • the active-surface system • the three-foci configuration • the receivers • the antenna calibration • the single dish observations • the sources and observations catalog

  8. Our contribution to ACS • A user feedback to product improvement • All our written code will be freely usable and distributable to whom of interest • We can exploit our Field-System experience to create a conjunction between FS and ACS

  9. FS as ACS client • properties and methods visible from ACS • FS shared variable can be settled by ACS through ANTCN (i.e.: fs->ionsor) • ANTCN is now an ACS client (.cpp) • FSInterface.c new added C program for FS remapping of function and variable, to avoid name incompatibilities (e.g.. “class”) • FS as ACS servant component for application using MarkX hardware (future)