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Re: New CDC prototypes II
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 -
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>>>> | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
>>>> '--' `-.--. | +
>>>> \_ | |---' Tel.: 001-757-269-5352 =
>>>> `-._\__/ Fax.: 001-757-269-6331 -
>>>> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>>>>
>>>>
>>
>
> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> ) `\ -
> / '. | +
> | `, 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 -
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>