Re: CDC upstream end config

[Tim Whitlatch <whitey@jlab.org>]

Thank you Fernando for your reply. This would require someone to install 
the FEP jacket on all the wire? Is this shrink wrap?

Thanks,

Tim

Fernando J. Barbosa wrote:
> Hi Tim,
>
> My comments follow:
>
> Tim Whitlatch wrote:
>> Hello All,
>>
>> Per our video conference this morning, the following was discussed;
>>
>> Gary will continue to manufacture a 24 place upstream plate with 
>> proper geometries from "geometry C". this will give room for 
>> simulating worst case spacial considerations for assy. He will pursue 
>> the original type setup with 5.5 inch long cables max.
>>
>> As a backup, Gary will manufacture an offset plate with the 24 holes 
>> to take the stress off the conductive rubber sleeve (per SLAVA)
>>
>> Fernando, Gary followed up on the coax cables you suggested. They all 
>> seem to come without an outside insulating jacket. Is it possible to 
>> use these cables by keeping the braided shield at ground? Also, is it 
>> possible to use cable that is not rated for our high voltage by doing 
>> some tests?
> Of the two suggestions to check the cable routing, one of the coaxes 
> should have a jacket but the semi-rigid cable should have an 
> aluminized jacket. In this case, an insulating sleeve/jacket needs to 
> be installed and there are various types offered by multiple 
> companies. I suggest FEP, if available in the required diameter. The 
> shield needs to be at HV and in normal operation the potential 
> difference between the shield and the inner conductor is zero. 
> However, if a straw wire is disabled, the full HV potential will be 
> present and the cable needs to conform to these requirements.
>
> Cables can certainly be tested at higher voltages than the rated 
> operating voltage specified by the manufacturer but that's a safety 
> issue. I strongly recommend against overlooking the manufacturer's 
> safety specifications.
>
> Regards,
> Fernando
>
>
>>
>> I will pursue with Tom Carstens from Hall B about connector leaks on 
>> their drift chambers.
>>
>> Yves will look at getting some extension pcbs made for testing 
>> Slava's ides per layout on 9-29-08. Can we get a connector made 
>> directly onto the HV board that would plug into this?
>>
>> Thanks for your time,
>>
>> Tim
>>
>>
>>
>>
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