[Comm2011] Status

[helmich]

Hi Gijs,

I haven't seen anything to indicate other problems. But the more eyes
looking for problems, the better.

Regards,
Ewout

On Fri, 29 Apr 2011 15:20:53 +0200, Gijs Verdoes Kleijn
<verdoes at astro.rug.nl> wrote:
> 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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>>
> 
> --
> --------------------------------------------------------------------
> |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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