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Re: CDC Layout
On Tue, 3 Mar 2009, Fernando J. Barbosa wrote:
Dear all,
please find my remarks below.
>
> Hi Curtis,
>
> I don't know where those numbers come from as I find no accounting for those.
> Most likely, Elke added spares and perhaps accounted for future price
> increases to provide some cushioning.
no, we went from 3300 to 3098 and now we go back to 3500.
I kept everything for 3300, because I thought a little bit of extra monay
will not harm.
>
> The numbers I have on GlueX-doc-747 are 3,098 straws which correspond to 130
> preamp cards. The production cost of the ASIC is estimated to be $169,500 and
> the CDC uses about 20% of the ASICs - $33.9k. The price per preamp card is
> estimated to be $114 - $14.8k for 130. So, the total for the CDC production
> is ~$49k.
>
> On Elke's schedule bar chart, line item 15212080 has $67,084 for the CDC
> preamp procurement but no quantity is shown and I don't know if this includes
> anything else. Given the number of preamp cards required, I would say we are
> safe but Elke may want to comment on this.
>
Fernando I gave you all the info last week. The fdc document for the
costs, the xls-sheets and there is also a cdc cost document, which is on
the portal
http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=764
> I plan to capture all the costs related to the electronics (ASICs, PCBs,
> cables, fADCs, etc) for both the CDC and the FDC in one single spreadsheet
> which is easier to update and keep track of. Cost estimates for increased
> channel numbers will then be easy to get. Please provide me with updates on
> the channel numbers once available from the current studies.
>
this is a good idee, bit I strongly suggest that the things are kept in
one place like in the past. Also the electronics is not completely under
the fdcs or the cdcs, so having it like that is differnt to how we need
things. Actually if there are changes Eugene I think it is better to
update the files on the m-drive.
cheers elke
> Thanks,
> Fernando
>
>
>
> Curtis A. Meyer wrote:
>> Hi Elke -
>>
>> for some reason, I thought that we had 3500 channels on the books,
>> not 3300 (basically the difference is in layer 28.) . With regard to the
>> space,
>> I am also worried about this, but with regard to the realestate for the
>> preamplifiers.
>> The design that we laid out a year ago had about 3100 channels. Now there
>> is certainly some space left, but it really comes down to can we squeeze
>> the preamplifiers on the plenum.
>> thanks for the comments -- Curtis
>>
>>
>> On Sun March 1 2009, Elke-Caroline Aschenauer wrote:
>>
>>> On Fri, 27 Feb 2009, Fernando J. Barbosa wrote:
>>>
>>> Dear Fernando and Curtis,
>>>
>>> the 3500 straws will be an increase in cost. I have budget everythig for
>>> 3300, it will be 200 more. this means 25 asics, 8 more preamp-cards
>>> HV-cards and 3 FADCc. I think it is not a big deal, but needs to be
>>> accounted for. I'm not sure, but maybe at a certain moment we might want
>>> to put in a CR to have things accounted correctly.
>>>
>>> But I have a different question, I totally understand more layers are
>>> nices for tracking, but do we get more problems with the cabeling. Because
>>> we wil have to make even more connections on a limited space.
>>>
>>>
>>
>>
>>
>>
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