You are here: Foswiki>AdaptiveOptics Web>Logs>Log_20110606 (07 Jun 2011, GBrusa)Edit Attach
Observer(s): L Busoni, A. Puglisi, S. Esposito, E. Pinna (Arcetri), G. Brusa (LBTO)

Telescope Operator:

SW Support:

Telescope Support: J. Little, M. Midkiff

Instrument Support:

The activity started around 8:30am and was spent for most of the day in measuring slope offsets in particular we sampled the dependency with the instrument rotation angle.

Here is the main results for today:BIN1, 400 corrected modes. FeII (1.64 um) slope offset for the following instrument rotation angles: 73, 133, 148, 163 degrees. It was found that the although the dependency from the angle is small is large enough to affect the SR at the level of a few percents for SR of 70-80%. Not correcting the slope offset or, worse, correcting with the wrong vector (i.e.) one measured for a different angle could results in as much as 10% reduction in SR.

Some initial measurement of the optical gain by mean of injecting a known, small, aberration thru the AS was tested. The idea is to use this method to confirm, and if necessary modify, that the electronic gain being used is still the optimal one. During long observations it can happen that the seeing changes and the loop is not longer running in an optimized way. THe first test was done optimizing the electronic gains at two different seeings (0.8 and 1.0 arcsec) and comparing the effect of a small time modulated aberration introduced at the ASM level. Since we did not have enough time to gather sufficient data the test was inconclusive, however the sftware was tested and proven to work.

-- Main.GBrusa - 07 Jun 2011
Topic revision: r1 - 07 Jun 2011, GBrusa
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