[Comm2011] Fwd: Re: emc tests

[E. Helmich]

-------- Original Message --------
Subject: 	Re: emc tests
Date: 	Tue, 22 Mar 2011 22:34:22 -0400
From: 	Ueli Weilenmann <uweilenm at eso.org>
To: 	Muschielok Bernard <mbernard at usm.lmu.de>
CC: 	Dietrich Baade <dbaade at eso.org>, Arno van Kesteren 
<avkester at eso.org>, "Sergio D'Orsi" <dorsis at oacn.inaf.it>, Roberto Tamai 
<rtamai at eso.org>, Christian Lucuix <clucuix at eso.org>, Ricardo Parra 
<rparra at eso.org>, Pietro Schipani <pietro.schipani at oacn.inaf.it>, VST 
<par-vst at eso.org>, Olaf Iwert <oiwert at eso.org>, Konrad Kuijken 
<kuijken at strw.leidenuniv.nl>, Ewout Helmich <helmich at astro.rug.nl>, 
Andrea Baruffolo <Andrea.Baruffolo at oapd.inaf.it>, "Edwin A. Valentijn" 
<valentyn at astro.rug.nl>



Dear Bernard,

to obtain the tilt measurement is a sort of a milestone for OCM1A.  
Therefore it is important that you have all the time necessary to  
determine this values. If we have to shift the VST1C period by one day  
and we can possibly absorb this in the second ESO acceptance test.

Best regards,
Ueli.





On 22 Mar 2011, at 21:09, Muschielok Bernard wrote:

>
>
> Dear Ueli:
>
> My main worry is that suddenly the EMC became higher priority than  
> preparation of the instrument for observations (on last Saturday our  
> common understanding was different). I am afraid that several people  
> will wait one additional day until we will be ready with the  
> technical things. There is a risk that we will be not able to  
> determine the tilt between detector and telescope within the  
> available time of OCM1A. This in consequence means that your strong  
> deadline 30th of June will be not reachable. I am open for any  
> reasonable proposals.
>
> Kind regards, Bernard
>
> On Tue, 22 Mar 2011, Ueli Weilenmann wrote:
>
>> Dear Bernard,
>>
>> I'm sorry, but we have to re-plan.
>> Otherwise these EMC tests will not be feasible within the  
>> commissioning time of the VST until June 2011. According to what I  
>> hear from Garching and Arno, he has also scheduled for other work  
>> here at Paranal.
>> If the shift of the commissioning activities produces problems in  
>> terms of your and your team's travel plans, ESO will assume  
>> potential costs that this may produce.
>>
>> I sincerely hope that we find a feasible solution.
>> Best regards,
>> Ueli.
>>
>>
>> On 22 Mar 2011, at 10:42, Muschielok Bernard wrote:
>>
>>> Dear Dietrich, dear Arno:
>>> On Mon, 21 Mar 2011, Dietrich Baade wrote:
>>>> Dear Arno,
>>>> As far as I can see, you have no reply yet.
>>>> Although, being far away and on top of that on leave, my view of  
>>>> things
>>>> is fairly limited, let me still try to give you some further  
>>>> arguments.
>>>> The main one that I see is that we have a delay of up to 3 days  
>>>> on the
>>>> part of OmegaCAM.  Part of this can be recovered because Pietro  
>>>> kindly
>>>> agreed to let OmegaCAM take over one day earlier than planned.  The
>>>> rest we will try to recover by hard work and re-shuffling of  
>>>> assignments.
>>> Because of this delay we are forced to cancel some tasks which are  
>>> not directly related to the primary goals of this commissioning  
>>> run - getting images with VST/OmegaCAM and determination of the  
>>> tilt between the telescope focal plane and detector plane. Only if  
>>> these goals we will be reached we have still a realistic chance to  
>>> finalise all commissioning tasks within the allowed time (until  
>>> end of June / very strong deadline). Unfortunately the EMC tests  
>>> do not belong the tasks which are directly related to these  
>>> primary goals. In addition they are scheduled for time which falls  
>>> now into period when we will be intensively working on preparation  
>>> of the instrument for taking images. Shifting them by few days is  
>>> also not possible because than we will be busy with the tilt stuff.
>>> Whan we have discussed these problems with Ueli he told us that  
>>> you are coming more frequenntly to Chile because of ALMA antenas.  
>>> I hope that a suitable date can be found to perform the EMC tests.
>>> I apologise very much that the delay has occured. We wanted to  
>>> catch it by additional work but we got a conflict with the  
>>> "maximum 14 days on Paranal rule" for detector people.
>>> Kind regards, Bernard
>>>> Since we _may_ get back to the plan and you are in Chile anyway,  
>>>> it may
>>>> make sense that you still do come to Paranal.  However, your work  
>>>> would
>>>> have low priority until we can be sure that we can back to  
>>>> schedule.
>>>> I realize that this is very unpleasant for you.  But the  
>>>> alternative could be
>>>> that the delay affects the work of many people whereas the EMC work
>>>> would mainly hit one person only.  Globally, this would still be  
>>>> the lesser
>>>> evil (however, I agree: an evil).
>>>> Please note that I'm not in a position to make any decision.  I'm  
>>>> just
>>>> stating my own opinion to prompt others, who are presently closer  
>>>> to the
>>>> stage, to pitch in their views.
>>>> Best regards and sorry for the unwelcome news,
>>>> Dietrich.
>>>> On 3/20/2011 11:59 PM, Arno van Kesteren wrote:
>>>>> Dear Ueli,
>>>>> this late cancellation actually doesn't make me too happy.
>>>>> I do not understand why with a delay of 2 days the whole test  
>>>>> has to be cancelled.
>>>>> Can't Omegacam postpone some activities that were planned 2 days  
>>>>> before my tests ?
>>>>> Without any Chilean activities scheduled for the next half year  
>>>>> this postponement will mean ESO will have to bear the costs of a  
>>>>> full Chilean business trip for just one day of tests.
>>>>> There was also some other work at Paranal I was going to do  
>>>>> (e.g. VST continuation of EMC tests due to high radiated  
>>>>> emission, is this also to be postponed) ?
>>>>> I strongly urge the Omegacam consortium to reconsider this  
>>>>> postponement and try to squeeze me into the current schedule  
>>>>> (after all, if everything goes right we could do the tests well  
>>>>> within a day when I prepare everything in advance).
>>>>> Hoping for a quick answer,
>>>>> Arno van Kesteren
>>>>> On 3/19/2011 3:16 PM, Ueli Weilenmann wrote:
>>>>>> Dear Arno,
>>>>>> The OmegaCAM team has accrued two days of delay with respect to  
>>>>>> the plan. They propose now to cancel the EMC tests for next  
>>>>>> weekend and re-schedule this activity to a next slot when you  
>>>>>> would be available here in Chile. This could be either in April  
>>>>>> or May, whatever suits you, INAF and OmegaCAM best
>>>>>> Could you please comment and propose a new date?
>>>>>> Many thanks, and sorry for the late notice.
>>>>>> Best regards, Ueli.
>>>>>> On 18 Mar 2011, at 13:12, Pietro Schipani wrote:
>>>>>>> Dear Arno,
>>>>>>> I am going to leave on Sunday; so far the news from Paranal  
>>>>>>> are that they have some ideas on the possible source of the  
>>>>>>> noise, apparently it would not be in the CAN Bus, but this has  
>>>>>>> to be better clarified of course.
>>>>>>> See you soon
>>>>>>> Pietro
>>>>>>> Arno van Kesteren ha scritto:
>>>>>>>> Dear Pietro,
>>>>>>>> I would recommend that before we meet next week at Paranal,  
>>>>>>>> in case you have some time left, it is investigated whether  
>>>>>>>> shields have been properly terminated at both ends,  
>>>>>>>> especially CAN bus lines.
>>>>>>>> And, in case not, please try to improve this by attaching the  
>>>>>>>> shield to the cabinet at both ends (through a connector in  
>>>>>>>> most cases) as described in the test report I made.
>>>>>>>> I had a similar case at ALMA where particularly excessive  
>>>>>>>> electromagnetic emission within the 500 - 1000 MHz was due to  
>>>>>>>> improper CAN bus shielding.
>>>>>>>> Wish you all the best with ongoing activities and see you at  
>>>>>>>> the end of next week,
>>>>>>>> Arno
>>>>>>>> On 3/7/2011 7:49 PM, Pietro Schipani wrote:
>>>>>>>>> Dear Arno,
>>>>>>>>> thanks a lot for your report!
>>>>>>>>> I had just a quick look for the moment (I took two days off  
>>>>>>>>> with my
>>>>>>>>> family, so now I am working in a hotel in a hidden place),  
>>>>>>>>> so far I have
>>>>>>>>> just a comment: the origin of the "mouse pointer" motion in  
>>>>>>>>> Verona were
>>>>>>>>> clearly the rotator motors when they were online (they  
>>>>>>>>> initially
>>>>>>>>> disturbed a lot all the stepper motors, so we revolutioned the
>>>>>>>>> electrical cabinet as you certainly remember), but  
>>>>>>>>> apparently during
>>>>>>>>> your tests they (fig.17) have produced no strange effect.
>>>>>>>>> We have to think about the possible noise source. Next time  
>>>>>>>>> we will meet
>>>>>>>>> in Paranal: I will arrive on March, 21. Indeed on March 25  
>>>>>>>>> we have
>>>>>>>>> planned some preparatory work to the first VST+OmegaCAM  
>>>>>>>>> observation
>>>>>>>>> nights, so unless we finish before, I would prefer to test  
>>>>>>>>> EMC again on
>>>>>>>>> 26-27.
>>>>>>>>> Best regards, see you in Paranal
>>>>>>>>> Pietro
>>>>>>>>> Arno van Kesteren ha scritto:
>>>>>>>>>> Dear Pietro and Ueli,
>>>>>>>>>> Here the report on my EMC tests and safety inspection I  
>>>>>>>>>> made a month
>>>>>>>>>> ago for your review.
>>>>>>>>>> As you may see there are some items still to be dealt with.
>>>>>>>>>> One important issue is to find the noise source of radiated  
>>>>>>>>>> emission,
>>>>>>>>>> we unfortunately didn't have the resources to go into  
>>>>>>>>>> further detail
>>>>>>>>>> last time. I have some ideas but maybe you could add some  
>>>>>>>>>> thoughts to
>>>>>>>>>> it Pietro.
>>>>>>>>>> I will return to Paranal on 25 March and will have that  
>>>>>>>>>> afternoon and
>>>>>>>>>> the 27th available for possible retest/inspections (on the  
>>>>>>>>>> 26th I test
>>>>>>>>>> Omegacam, could possible also in parallel make some tests  
>>>>>>>>>> in the VST
>>>>>>>>>> Telescope if needed).
>>>>>>>>>> Let me know, wish you success with the ongoing activities.
>>>>>>>>>> Greetings, Arno van Kesteren
>>>>>>>>>> P.S. please distribute further if needed
>>>>>>>>>> On 1/31/2011 1:27 PM, Pietro Schipani wrote:
>>>>>>>>>>> Dear Arno,
>>>>>>>>>>> Sergio told me you had yesterday your test session... was  
>>>>>>>>>>> everything ok?
>>>>>>>>>>> Will you send us your results?
>>>>>>>>>>> Thanks a lot for your work, I am just sorry I didn't meet  
>>>>>>>>>>> you in
>>>>>>>>>>> Paranal. See you next time (not for VST hopefully!).
>>>>>>>>>>> Best regards
>>>>>>>>>>> Pietro
>>>> -- 
>>>> Dietrich Baade
>>>> ESO - European Organisation for Astronomical Research in the  
>>>> Southern Hemisphere
>>>> Karl-Schwarzschild-Strasse 2,  85748 Garching bei Muenchen,   
>>>> Germany
>>>> Email: dbaade at eso.org    Tel: +49 89 3200-6388    Fax: +49 89  
>>>> 3202362
>>
>>