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http://hdl.handle.net/20.500.12386/30690
Titolo: | The crystal ball, the spider and other stories: a journey around the test tower of the M4 adaptive mirror | Autori: | BRIGUGLIO PELLEGRINO, RUNA ANTONIO PARIANI, Giorgio XOMPERO, MARCO TOFANI, BEATRICE Rossetti, Marco CALABRETTO, Paolo RICCARDI, Armando |
Data pubblicazione: | 2018 | Titolo del volume in cui è pubblicato il poster: | Adaptive Optics Systems VI | Curatore/i del volume in cui è pubblicato il contributo: | Close, Laird M.; Schreiber, Laura; Schmidt, Dirk | Serie: | PROCEEDINGS OF SPIE | Numero: | 10703 | Da pagina:: | 1070373 | Abstract: | M4 is the adaptive mirror of ELT, currently at its FDR. It is composed by 6 thin shell mirror segments, controlled by 5136 voice coil actuators. Before its installation at the telescope, it will be optically calibrated on a test facility (OTT) in Italy. The calibration includes the computation of the flattening command and the segments co-phasing, i.e. the correction of the differential piston amongst them. Given the large complexity of the deformable mirror and the very tight requests on the measurement accuracy, we set-up a risk-mitigation activity based on the laboratory demonstration of some key elements within the test tower. In this paper we present the results of the experimentation. We measured at nanometer level the interferometric cavity; we investigated how the interferometer reacts in presence of spider arms dividing the test mirror into separated islands; we integrated and tested a multi wavelength sensor to measure the inter-segment absolute differential piston; we aligned and tested for stability the pupil relaying optical system to be installed on the OTT. Such activity is performed in the AO laboratory at INAF-Arcetri in Italy, in preparation of the M4 optical calibration on the OTT, scheduled to start in 2020. The M4 project is led by the Italian consortium AdOptica under an ESO contract. | Titolo del convegno: | Adaptive Optics Systems VI | Luogo del convegno: | Austin, Texas, United States | Periodo del convegno: | 10-15 June, 2018 | URI: | http://hdl.handle.net/20.500.12386/30690 | URL: | https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10703/2311334/The-crystal-ball-the-spider-and-other-stories--a/10.1117/12.2311334.short?SSO=1 | ISSN: | 0277-786X | ISBN: | 9781510619593 9781510619609 |
DOI: | 10.1117/12.2311334 | Bibcode ADS: | 2018SPIE10703E..73B | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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