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Re: CDC Layout
Hi Elke,
Sorry about the delay in my response. I hope you are doing well and
enjoying your new job at BNL. My remarks follow:
Elke-Caroline Aschenauer wrote:
> 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.
Indeed the document outlining the costs for the CDC shows 3300 straws.
>
>>
>> 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
Yes, I have all the information now with the document you reference.
>
>> 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.
My intention of grouping the electronics is to make it easier to trace
and update procurement costs as the FDC and the CDC share quite a lot of
the electronics, as intended to reduce costs. A more subtle point is
that the cost of the ASIC, for example, has to be shared between the FDC
and the CDC in its totality or erroneous estimates will result if this
is not taken into account. This approach will also be taken for all the
other detectors, for similar reasons, but this "budgeting" is only for
my own use and traceability and not for the official budget, which you
have already submitted.
Best regards,
Fernando
>
> 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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