Re: CDC prototype

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

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

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                          /   Yves Van Haarlem
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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
>>>> 
>> 
>