GREGOR - The Calibration Unit
Abstract
In 2010 we expect "first light" for GREGOR - a new solar telescope with large aperture and modern scientific instruments. It is designed to observe small-scale dynamic magnetic structures below a size of 70 km on the Sun with high spectral resolution and polarimetric accuracy. For this purpose, the polarimetric concept of GREGOR is based on a combination of post-focus polarimeters with pre-focus equipment for high precision calibration. The Astrophysical Institute Potsdam developed the GREGOR calibration unit which is an integral part of the telescope. We give an overview on function and design of the calibration unit and present the results of extensive testing series in the Solar Observatory "Einsteinturm".
- Publication:
-
European Solar Physics Meeting
- Pub Date:
- September 2008
- Bibcode:
- 2008ESPM...12..6.9H