targets

[Silviu Covrig <silviu@krl.caltech.edu>]

Hi,

I thought that maybe you guys should have this information, since some 
people started asking questions about the dummy targets,

Silviu

The exact numbers for the extra targets in g0 are:

halo targets: small : diameter 5.46 mm 
              big : diameter 11.05 mm + copper ring sitting upstream of
                    the target, ID the same with the target, OD of 19.05
                    mm, thickness of 3.912 mm to match the rad length of
		    1" of Al (Herbert's request), mounted on the Al frame
		    with 2 Copper screws that sit in a horizontal plane
	      C target : five slabs of graphite of rectangular shape
	                 L = 10.465 mm
			 l = 10.211 mm almost square
			 h = 4.9 mm

The C target sits behind a hole of 9.525 mm diameter in the Al frame. The
slabs a kept in place by four Copper screws, one at each corner and it is
not rotated with respect to the beam line.
Thickness of the Al frame that holds the targets is 3.05 mm.