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8 July 2014 First successful deployment of the ZIMPOL-3 system at the GREGOR telescope
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Since several years the Zurich Imaging polarimeter (ZIMPOL) system is successfully used as a high sensitivity polarimeter. The polarimeter system, which is mainly based on a fast modulator and a special demodulating camera with a masked CCD, has been continuously improved. The third version of the system (ZIMPOL-3) is routinely used at IRSOL, Locarno. The fast modulation allows to “freeze” intensity variations due to seeing, and to achieve a polarimetric sensitivity below 10-5 if the photon statistics is large enough. In October 2013 the ZIMPOL system has been brought and installed for the first time at the GREGOR telescope in Tenerife for a spectropolarimetric observing campaign. There, the system configuration took advantage from the calibration unit installed at the primary focus of the GREGOR telescope, while the analyzer was inserted in the optical path just before the spectrograph slit after several folding mirrors. This setup has been tested successfully by the authors for the first time in this occasion.
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Renzo Ramelli, Daniel Gisler, Michele Bianda, Nazaret Bello González, Svetlana Berdyugina, and Dirk Soltau "First successful deployment of the ZIMPOL-3 system at the GREGOR telescope", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91473G (8 July 2014);

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