[Comm2011] Fwd: AW: AW: CCD # 92 / Going home

[John P. McFarland]

Hi All,

On the night of 10/11 Sept, the quick check shows that ESO_CCD_#93 (ninety-three) shows anomalous behavior.  The light sensitive region is significantly below the overscan regions (60-130 ADU versus ~185) and shows a gradient in the Y-direction (see attachment, overscan pixels are white here).  I do note what at first appears to be bright cosmic ray events, but upon closer inspection look more like chip anomalies (e.g., hot pixels, traps).

Cheers,


-=John


On 12 Sep, 2011, at 11:27 , K Kuijken wrote:

> Dear all:
> 
> worrying news from eso: one of the ccd's is not working properly.
> I will keep you posted.
> Koen
> 
> -------- Original Message --------
> Subject: AW: AW: CCD # 92 / Going home
> Date: Mon, 12 Sep 2011 09:04:47 +0000
> From: Dietrich Baade <dbaade at eso.org>
> To: K Kuijken <kuijken at strw.leidenuniv.nl>
> CC: mbernard at usm.lmu.de <mbernard at usm.lmu.de>
> 
> Hi Konrad,
> 
> Sorry for the oversight.  I'm still on leave.
> 
> As far as I understood, CCD #92 has lost its light sensitivity and only 
> produces bias images.
> 
> Best regards,
> 
> Dietrich.
> ________________________________________
> Von: K Kuijken [kuijken at strw.leidenuniv.nl]
> Gesendet: Montag, 12. September 2011 10:59
> Bis: Dietrich Baade
> Betreff: Re: AW: CCD # 92 / Going home
> 
> Hi Dietrich,
> I seem to have missed the first emails in this series.
> What is the problem?
> Konrad
> 
> 
> Dietrich Baade wrote:
>> Hi Olaf,
>> 
>> This does sound bad.  Especially since, as far as I remember, #92 has not previously shown any anomalies (or should the number be 82??).
>> 
>> While I still sincerely hope that we haven't exhausted the possibilities of remote diagnostics (and even remote corrective action) - in the case of such severe symptoms I would expect much more detailed information from Paranal - please prepare for the worst:
>> 
>> Identify a replacement device and put it on the test bench.
>> 
>> Thank you and best regards,
>> 
>> Dietrich.
>> 
>> 
>> ________________________________________
>> Von: Olaf Iwert [oiwert at eso.org]
>> Gesendet: Sonntag, 11. September 2011 20:17
>> Bis: Javier Valenzuela
>> Cc: Nicolas Haddad; Miguel Riquelme; Frederic Yves Joseph Gonte; Dietrich Baade; Olaf Iwert; Dietrich Baade; Christoph Geimer
>> Betreff: CCD # 92 / Going home
>> 
>> Dear Javier&  Frederic,
>> 
>> Being tired and hungry, I will go home now.
>> 
>> If you still want to talk today, please give me a call at home +49 / 89
>> / 120 11 474
>> 
>> Good luck with all tests to find the cause, as discussed via phone.
>> Olaf
>> 
>> --
>> Olaf Iwert
>> ESO - European Organisation for Astronomical Research in the Southern Hemisphere
>> Karl-Schwarzschild-Strasse 2,  D-85748 Garching bei Muenchen,  Germany
>> Email: oiwert at eso.org    Tel: +49 89 32006353    Fax: +49 89 32006489
>> 
>> 
> 
> 
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> 

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