[A1n_d2n] To do items from today's meeting

[Jay Benesch]

Ryerson stock list has 6061-T6 tubes with 7/8" OD (2.223 cm) and wall 
thicknesses 0.035, 0.049, 0.058, 0.065, 0.083 and 0.125".   Ops can 
thread the beam through any one of these, or a 3/4" OD tube for that 
matter.  Same wall thicknesses available for latter.  I like Brad's idea.

Jay

https://www.ryerson.com/stocklist

> 
> the empty target position now has +/-0.522" or +/-1.325cm of space both above and below. This is the full distance to the solid target holder and to the reference cell wall.  Sounds like a 2.5cm OD Al tube is too big to fit in.  Jianping probably can comment on this.