Re: CDC prototype

[Tim Whitlatch <whitey@jlab.org>]

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
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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
>>>>>
>>>
>>
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