[Halld-tracking-hw] CDC Straw Tubes

[Curtis A. Meyer]

Hi Everyone -

       we have finished going through the 252 straws that were sent to 
us by Lumina.
Other than the scratches that we talked about at the meeting last week, 
the straws
appear to be pretty good. The final numbers on the mechanical acceptance 
are:

     186/252 straws are good
       28/252 straws were rejected because they were oval. Better 
packing in the
                   shipping box would probably recover all of these. 
This would give
                   us an acceptance rate of:
     214/252  or 84.9%   and we would need 4120 straws to get 3500.

     Of the rejected ones,  19 were rejects due to imperfections in the 
straws,
     wrapping, glueing, extra crud stuck to them, ..... The remaining 17 
were
     bowed beyond the 1/10 inch specification. This appears to be in the 
straw
     and not due to shipping or packing.

      In order to improve the regular shipment, the box containing the 
straws probably
      needs to be compartmentalized so that there are fewer straws 
pressing on each other.
      Perhaps a wine-crate like structure that has ~ 40 straws in each 
compartment???

      The overall biggest issue that we saw was the scratches on the 
straws. The vendor did
not have that on the original samples that we received (a year ago).

    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/