Re: CDC prototype

[Yves Van Haarlem <yvhaarle@ernest.phys.cmu.edu>]

Hi Tim,

Friday 10am is good for both Gary and me. I believe it might be a problem 
for Curtis as he teaches on Friday mornings if I am not mistaken.

Cheers,
 	Yves

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                          /   Yves Van Haarlem
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     |[][][][][][]|:= /          Wean Hall room 8404
   __| __         |__ \       	 Pittsburgh, PA 15213
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On Tue, 4 Nov 2008, Tim Whitlatch wrote:

> Thanks Yves,
>
> We can discuss some of the ideas maybe later in the week. Are you, Gary and 
> Curtis available Friday 10am?
>
> Tim
>
> Yves Van Haarlem wrote:
>> Hi All,
>> 
>> I had some discussion with Gary and I can list some things we learned by 
>> wiring up this prototype:
>> 
>> - The teflon wires are very stiff and difficult to handle, all the wires 
>> have the same length at the moment - it would make things easier if all 
>> wires have different lengths dependent on the distance: connector-wire.
>>   --> use different cable?
>> 
>> 
>> - It would be good to glue the pin in the pinholder (add one drip of glue) 
>> after stringing the wires. In this way it is not so easy to break a wire if 
>> something goes wrong with connecting the cables to it. We plan to do this 
>> in the future.
>> 
>> 
>> - Due to the fact that 8 straws are not read out (the preamp now has only 
>> 16 channels) the mapping is messed up (those 8 straws have to be on the 
>> edges) - this did not make things easier.
>> 
>> 
>> Overall it was not easy to cable those straws up and more thinking is 
>> needed. We also plan on building a model to test more possibilies. Our 
>> priority at the moment is to finish the new prototype first.
>> 
>> 
>> Cheers,
>>     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 Fri, 31 Oct 2008, Yves Van Haarlem wrote:
>> 
>>> Hi Tim,
>>> 
>>> I believe not - but I am not 100% sure - we plan to build something larger 
>>> to simulate the real situation.
>>> 
>>> Cheers,
>>>     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 Fri, 31 Oct 2008, Tim Whitlatch wrote:
>>> 
>>>> Thanks Yves,
>>>> 
>>>> In the pictures it looks like the conductive rubber sleeves are highly 
>>>> strained. Also, was all the wiring done from 1 side to simulate the 
>>>> actual situation?
>>>> 
>>>> Thanks,
>>>>
>>>>      Tim
>>>> 
>>>> Yves Van Haarlem wrote:
>>>>> Hi Tim,
>>>>> 
>>>>> Unfortunately Gary is sick at the moment and I was not here when the 
>>>>> wiring was done. But this is what I know:
>>>>> 
>>>>>> How did the wiring to the crimp pins go?
>>>>> It was a bit painful because of a weird mapping: 8 channels will not be 
>>>>> read out at first - so those had to go to the edges. We used Teflon 
>>>>> cables because those are better protected for soldering but they are 
>>>>> stiffer. The cables all have the same length and there is discussion to 
>>>>> make the lengths variable.
>>>>> 
>>>>>> What order was the assembly done in (wires soldered to connector first?
>>>>> First the connector is made gas tight. Then the wires are soldered to it 
>>>>> and marked plus the conductive booties are attached to the cables. I 
>>>>> believe then the connector is screwed on the end plenum and the wires 
>>>>> are moves over the crimp pins.
>>>>> 
>>>>>> then connector secured and then wires connected to crimp pins)? How 
>>>>>> much sca for doing this between plexiglass and crimp pins?
>>>>> The thickness of the end plenum is 2 inch, the length of the cables is 3 
>>>>> inch - they could have been shorter if not for this weird mapping.
>>>>> 
>>>>> We believe that this method is not the perfect one and should be 
>>>>> improved. As soon Gary is here we have more info.
>>>>> 
>>>>> Cheers,
>>>>>     Yves
>>>>> 
>>>>> 
>>>>>> 
>>>>>> Thanks,
>>>>>>
>>>>>>      Tim
>>>>>> 
>>>> 
>>> 
>