[Comm2011] Fwd: shimming news

[Konrad Kuijken]

Dear all:

some good news from Paranal!
I am analysing the latest set of focus runs, but meanwhile the fwhm  
variation in these very good seeing images look very, very small.
K

Begin forwarded message:

> From: Pietro Schipani <pietro.schipani at oacn.inaf.it>
> Date: July 27, 2011 12:54:27 GMT+02:00
> To: Konrad Kuijken <kuijken at strw.leidenuniv.nl>,  Lothar Noethe <lnoethe at eso.org 
> >, Dietrich Baade <dbaade at eso.org>, Ueli Weilenmann  
> <uweilenm at eso.org>,  Ricardo Parra <rparra at eso.org>, Octavio Lavin <olavin at eso.org 
> >, nhaddad at eso.org,  Muschielok Bernard <mbernard at usm.lmu.de>,  
> Andrea Baruffolo <Andrea.Baruffolo at oapd.inaf.it>,  Thomas Szeifert <tszeifer at eso.org 
> >, Steffen Mieske <smieske at eso.org>
> Cc: Massimo Capaccioli <mc at na.infn.it>,  Javier Argomedo <argomedo at arcetri.astro.it 
> >, Jacopo Farinato <jacopo.farinato at oapd.inaf.it>,  Gabriele  
> Umbriaco <gabriele.umbriaco at unipd.it>, Massimo Dall'Ora <massimo.dallora at live.it 
> >,  Sergio D'Orsi <dorsis at oacn.inaf.it>, Laurent Marty <laurent at oacn.inaf.it 
> >,  Carmelo Arcidiacono <carmelo at arcetri.astro.it>, Roberto  
> Ragazzoni <roberto.ragazzoni at oapd.inaf.it>,  Demetrio Magrin <demetrio.magrin at oapd.inaf.it 
> >
> Subject: shimming news
>
> Dear all,
> please find attached something you will probably appreciate.
> The PSF anisotropies tonight were "flat" on the whole field, with  
> ellipticities of about 10% and a symmetric pattern which in some  
> cases well recalls the theoretical pattern described by Lothar in  
> his analysis. The FWHM  have been always well below the DIMM value  
> (included in the title of the figures). The depth of focus in terms  
> of M2 positions measured by the focuser scripts is roughly about  
> 20-30 microns, i.e. more or less as expected from theory. The  
> results of new tilt measurements with both Konrad's method and the  
> Shack-Hartmann are as usual in agreement and say the effect was  
> reduced to negligible values.
> We have just 1 night data, but now we know that, provided the AO  
> correction is good and the defocus is well controlled in the middle  
> of the mosaic, the images can be good in the whole 1 deg ^2.  
> Therefore we can say it was worth to do the shimming. It has been  
> really a very hard and delicate job, involving many people for many  
> days and nights. I have to thank all my colleagues, the ESO team who  
> gave a massive help and produced the shims, the OmegaCAM team who  
> supported the operations.
> Certainly I missed somebody in the list, sorry but it's time to  
> sleep...
> See you soon,
> Pietro
>
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