[Halld-tracking-hw] straw lengths

[Curtis A. Meyer]

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/