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Re: New CDC prototypes II
Hi All,
My 2 cents....
I believe the mechanical prototype needs to be something different (full
length and circular as Yves said). Our last discussion was to make a
full 3 layer circle (+/-6° and 0°) and test sag, compression and twist
stability. This would address comments by the review committee.
Cheers,
Tim
Yves Van Haarlem wrote:
> Dear Elke,
>
> Thank you for your feed back.
>
> As I see it - in first order this prototype is meant for tests in
> beams/magnets and for easy transport, that's why it is so small. We
> plan to produce more than one of these prototypes. We have to do as
> much mechanical and construction tests as possible; what is already
> planned is to try to get a better glue joint between feed-thru and
> donut (a concern shared by Gary, Tim, and Slava), another one is to
> pot the connector where the HV board has to go in, a third one is to
> find good ways to get the thing gas tight. I hope Tim and Slava have
> advice/questions concerning this prototype, it might even be a good
> idea to have a small meeting. To do really full scale mechanical tests
> we need to do tests separetely I believe; one test in progress is to
> glue a full ring of 1.5 m long straws together to study the sag. We
> also discussed mechanical tests that need to be done with Tim and
> Slava last review, if I recall correctly Tim is planning to do some
> tests himself.
>
> I agree that waiting for the review report is a good idea as is having
> this discussion (at the moment nothing is being built yet, we found
> that we have enough crimp pins and barely enough pin-holders, we need
> to produce donuts and feed-thrus).
>
> Cheers and have a nice weekend,
> Yves
>
>
> /--------------------------------
> / Yves Van Haarlem
> _--~~--_ /
> /~/_| |_\~\ / Carnegie Mellon University
> |____________| / Department of Physics
> |[][][][][][]|:= / Wean Hall room 8404
> __| __ |__ \ Pittsburgh, PA 15213
> | ||. | == | | \ USA
> (| ||__| == | |) \
> | |[] [] == | | \ Tel.: +1 412 268-6949
> | |____________| | \ +1 412 641-9252
> /__\ /__\ \ Fax.: +1 412 681-0648
> ~~ ~~ \-----------------------------------
>
> On Sat, 5 Apr 2008, Elke-Caroline Aschenauer wrote:
>
>> On Fri, 4 Apr 2008, Yves Van Haarlem wrote:
>>
>> Dear Yves,
>>
>> thanks for the update. I was wondering don't we not want to see what the
>> recommendations from the review are? Maybe there is a chance to adress
>> them with this prototype, of course I have no idea what
>> recommendations we
>> will get.
>>
>> One other question are 24 straws really enough doing a full mechanical
>> test. I think it would be good to ask Tim for some advise on the scaling
>> of the prototype so we can test all the mechanical issues.
>>
>> cheers elke
>>
>>
>>> Date: Fri, 4 Apr 2008 17:22:45 -0400 (EDT)
>>> From: Yves Van Haarlem <yvhaarle@ernest.phys.cmu.edu>
>>> To: halld-tracking-hw@jlab.org
>>> Subject: New CDC prototypes II
>>>
>>> Hi All,
>>>
>>> We just started to gather the necesary pieces for a prototype
>>> containing
>>> 24 straws (1 preamp) in 6 layers of 4 straws each - honeycomb
>>> packed. The
>>> (rectangular) endplates will be 9x8 cm2 and the chamber will be 40 cm
>>> long. The "upstream" end plate will be 9 mm thick Al, the
>>> "downstream" one
>>> 4 mm thick Carbon Fibre.
>>>
>>> Cheers and have a nice weekend,
>>> Yves
>>>
>>> /--------------------------------
>>> / Yves Van Haarlem
>>> _--~~--_ /
>>> /~/_| |_\~\ / Carnegie Mellon University
>>> |____________| / Department of Physics
>>> |[][][][][][]|:= / Wean Hall room 8404
>>> __| __ |__ \ Pittsburgh, PA 15213
>>> | ||. | == | | \ USA
>>> (| ||__| == | |) \
>>> | |[] [] == | | \ Tel.: +1 412 268-6949
>>> | |____________| | \ +1 412 641-9252
>>> /__\ /__\ \ Fax.: +1 412 681-0648
>>> ~~ ~~ \-----------------------------------
>>>
>>> On Wed, 2 Apr 2008, Fernando J. Barbosa wrote:
>>>
>>>> Hi Elke,
>>>>
>>>> For tests without a magnet, there is the AGS test line at BNL.
>>>>
>>>> For tests with a magnet, you may want to check if the MPS area is
>>>> available
>>>> at BNL (that's where E852 ran). Alex may have good contacts there,
>>>> also.
>>>>
>>>> Regards,
>>>> Fernando
>>>>
>>>> Elke-Caroline Aschenauer wrote:
>>>>> On Wed, 2 Apr 2008, Yves Van Haarlem wrote:
>>>>>
>>>>> Dear Yves,
>>>>>
>>>>> I think the question is what is the size of the prototype you want to
>>>>> build and what would you like to study. cosmic data in a magnetic
>>>>> field or
>>>>> beam on mini-cdc in B field, or ....
>>>>> Because if we want to match the situation of Gluex for different
>>>>> things we
>>>>> need different magnets.
>>>>> There was for example the offer to study something at Idaho
>>>>> Accelerator
>>>>> Center, but that needs more investigation.
>>>>>
>>>>> cheers elke
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Date: Wed, 2 Apr 2008 10:36:07 -0400 (EDT)
>>>>>> From: Yves Van Haarlem <yvhaarle@ernest.phys.cmu.edu>
>>>>>> To: Simon Taylor <staylor@jlab.org>
>>>>>> Cc: halld-tracking-hw@jlab.org
>>>>>> Subject: Re: New CDC prototypes
>>>>>>
>>>>>> Hi Simon,
>>>>>>
>>>>>> Thanks a lot for the info. Could you give more information or a
>>>>>> contact
>>>>>> person that might know more concerning this magnet?
>>>>>>
>>>>>> Thanks,
>>>>>> Yves
>>>>>>
>>>>>>
>>>>>> /--------------------------------
>>>>>> / Yves Van Haarlem
>>>>>> _--~~--_ /
>>>>>> /~/_| |_\~\ / Carnegie Mellon University
>>>>>> |____________| / Department of Physics
>>>>>> |[][][][][][]|:= / Wean Hall room 8404
>>>>>> __| __ |__ \ Pittsburgh, PA 15213
>>>>>> | ||. | == | | \ USA
>>>>>> (| ||__| == | |) \
>>>>>> | |[] [] == | | \ Tel.: +1 412 268-6949
>>>>>> | |____________| | \ +1 412 641-9252
>>>>>> /__\ /__\ \ Fax.: +1 412 681-0648
>>>>>> ~~ ~~ \-----------------------------------
>>>>>>
>>>>>> On Wed, 2 Apr 2008, Simon Taylor wrote:
>>>>>>
>>>>>>
>>>>>>> Hi, Yves.
>>>>>>>
>>>>>>> Regarding the availability of suitable magnets, the short answer
>>>>>>> is that
>>>>>>> it
>>>>>>> would be difficult to find any magnets with sufficient magnetic
>>>>>>> field or
>>>>>>> gap
>>>>>>> size or with the correct orientation for cosmic ray studies such
>>>>>>> that the
>>>>>>> magnetic field would be parallel to the straws. Certainly we
>>>>>>> came up with
>>>>>>> nothing truly suitable for studying the FDC. The magnet we used
>>>>>>> in Hall B
>>>>>>> has
>>>>>>> a gap of about 15 cm and goes up to ~1.2 Tesla. You could in
>>>>>>> principle
>>>>>>> fit a
>>>>>>> few layers of straws in there, but the magnetic field would be
>>>>>>> perpendicular
>>>>>>> to the wires, so that's no good. I have a vague recollection
>>>>>>> that there
>>>>>>> may
>>>>>>> be a magnet at Brookhaven that at least has a large enough gap
>>>>>>> size (48
>>>>>>> inches)...
>>>>>>>
>>>>>>> Simon
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Yves Van Haarlem wrote:
>>>>>>>
>>>>>>>> Hi All,
>>>>>>>>
>>>>>>>> As you might know we plan to build one or more smaller
>>>>>>>> prototypes of the
>>>>>>>> CDC in order to test the straws in a test beam and magnetic
>>>>>>>> field. The
>>>>>>>> first thing I would like to pin down are the dimensions of this
>>>>>>>> new
>>>>>>>> prototype. In order to use it inside a magnet it has to fit
>>>>>>>> inside that
>>>>>>>> magnet (yes indeed). I understood from last review that a
>>>>>>>> magnet search
>>>>>>>> was
>>>>>>>> performed for the FDC so I am hoping they could give me some
>>>>>>>> input on
>>>>>>>> what
>>>>>>>> is available.
>>>>>>>>
>>>>>>>> Cheers and thanks,
>>>>>>>> Yves
>>>>>>>>
>>>>>>>>
>>>>>>>> /--------------------------------
>>>>>>>> / Yves Van Haarlem
>>>>>>>> _--~~--_ /
>>>>>>>> /~/_| |_\~\ / Carnegie Mellon University
>>>>>>>> |____________| / Department of Physics
>>>>>>>> |[][][][][][]|:= / Wean Hall room 8404
>>>>>>>> __| __ |__ \ Pittsburgh, PA 15213
>>>>>>>> | ||. | == | | \ USA
>>>>>>>> (| ||__| == | |) \
>>>>>>>> | |[] [] == | | \ Tel.: +1 412 268-6949
>>>>>>>> | |____________| | \ +1 412 641-9252
>>>>>>>> /__\ /__\ \ Fax.: +1 412 681-0648
>>>>>>>> ~~ ~~ \-----------------------------------
>>>>>>>>
>>>>>>>
>>>>>
>>>>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>>>>> ) `\ -
>>>>> / '. | +
>>>>> | `, Elke-Caroline Aschenauer =
>>>>> \,_ `-/ -
>>>>> ,&&&&&V Jefferson Lab +
>>>>> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
>>>>> ,&&&&&&&&&&; Suite 8 Hampton, VA 23664 -
>>>>> | |&&&&&&&;\ 12000 Jefferson Ave +
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>>>>> | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
>>>>> '--' `-.--.
>>>>> | +
>>>>> \_ | |---' Tel.:
>>>>> 001-757-269-5352 =
>>>>> `-._\__/ Fax.:
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>>>>>
>>>>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>>>>>
>>>>>
>>>
>>
>> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
>> ) `\ -
>> / '. | +
>> | `, Elke-Caroline Aschenauer =
>> \,_ `-/ -
>> ,&&&&&V Jefferson Lab +
>> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
>> ,&&&&&&&&&&; Suite 8 Hampton, VA 23664 -
>> | |&&&&&&&;\ 12000 Jefferson Ave +
>> | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
>> | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
>> '--' `-.--. | +
>> \_ | |---' Tel.: 001-757-269-5352 =
>> `-._\__/ Fax.: 001-757-269-6331 -
>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>>
begin:vcard
fn:Timothy Whitlatch, PE
n:Whitlatch;Timothy
tel;work:757-269-5087
tel;fax:757-269-5279
version:2.1
end:vcard