[Comm2011] Status

[Gijs Verdoes Kleijn]

Dear Ewout,

Thanks for the update. As soon as the data has arrived here and is 
ingested we will focus on the QuickCheck and gain measurements at 
various FIERA/preamp settings. To help us give useful feedback for you.
-What is considered suboptimal besides the slightly higher readnoise?

In any case we will evaluate saturation behavior here.

Best wishes, Gijs

helmich wrote:
>
> Hi everyone,
>
> Part of this mail is covered in previous mails. The first day we have 
> spent mostly on gain, readnoise, quickcheck etc. meant to determine 
> the best FIERA/preamp settings. I think we have not reached an optimal 
> solution. Input from Groningen is appreciated: Olaf & co from ESO are 
> very eager to get this out of the way, and for us it is best as well 
> if we can settle on final settings now. With the FIERA filtering 
> changed and the preamp increased as well, we get saturation at ~65000 
> ADU. Gain is relatively high ~2.5e/ADU. Readnoise in ADU is ~2.0 ADU, 
> but in e is high ~5.0 e- (sometimes higher, and therefore slightly 
> outside specificiations).
>
> If we cannot accept this, then changes of hardware components are 
> necessary. Obviously, if we can be satisfied with the current setup 
> this is convenient.
>
> Yesterday was spent with us doing readnoise, quickcheck, bias, in the 
> morning while afterwards Olaf worked on the instrument. In the 
> afternoon Bernard & co arrived and they've been working on shimming. 
> This will continue today and Bernard estimates is finished this 
> evening at the earliest. 
>
> Regards, 
>
> Ewout 
>
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>
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>   

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|dr Gijs Verdoes Kleijn         |   astronomer                     |
|e-mail: verdoes at astro.rug.nl   |   OmegaCEN / Kapteyn Institute / |
|www: www.astro.rug.nl/~verdoes |   Target                         |
|tel: +31-50-3638326            |   University of Groningen        |
|mobile: +31-654658050          |   postal address:                |
|                               |   Kapteyn Astronomical Institute |
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|                               |   The Netherlands                |
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