[Halld-tracking-hw] straw lengths

[Curtis A. Meyer]

Hi Tim -

    the regular stereo layers are all the same length. However, the 
"close-packed" ones
do vary. We picked an average value for layers 6 & 8, and will certainly 
work to get
them as long as possible.

   Curtis
On 12/15/10 4:05 PM, Tim Whitlatch wrote:
> Hi Curtis,
>
> SS for the nipple is fine.
>
> If you can check the length of all the stereo straw layers now, that 
> would be helpful. Slava's 3D model shows that 59.240 (as Gary measured 
> on the first stereo row) will work for all layers. There may be up to 
> a mm gap on both ends at some layers. This should not cause any problems.
>
> Tim
>
> Curtis A. Meyer wrote:
>> Hi Tim
>>
>>   we did not directly measure the lengths of the straws. We have been 
>> fitting them to be as long
>> as possible and still be able to get them in and then back 
>> calculating from the 150 length. The stereo
>> are tricky this way as it is nearly opposite corners that matter. We 
>> are just going to measure the
>> lengths this morning with the most accurate straight edge we have and 
>> that will be "it"!
>>
>>    With regard to the gas nipple that Slava wants to have made. We 
>> were looking at the
>> drawings carefully and the thin parts of the nipple are only 20mil 
>> thick. To make sure that
>> they are not broken when clamping the tube onto the nipple, we think 
>> that they must be
>> made of of stainless.
>>
>>   curtis
>> On 12/15/10 9:18 AM, Tim Whitlatch wrote:
>>> Hi Curtis,
>>>
>>> I do not understand the stereo straw length changes. Previously in 
>>> your preliminary procedures you had a cut stereo straw length of 
>>> 59.280. Slava suggested 59.245 so the straws would fit everywhere 
>>> with about a 1mm gap (plus effect from variation in angle).
>>> The numbers below are about 4mm shorter than you previously said you 
>>> would use. Are these numbers below correct? Please verify.
>>>
>>> Thanks,
>>>
>>>       Tim
>>>
>>> Curtis A. Meyer wrote:
>>>> Hi Everyone -
>>>>
>>>>    just to summarize on straw lengths:
>>>>
>>>>     straight straws:  58.975 incehs
>>>>     normal stereo straws:  59.130 inches
>>>>     interlocking stereo straws:  59.170 inches
>>>>
>>>>     - Curtis
>>>>
>>
>>


-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/