Painting and relabeling of the modified lower center block (TSH0461) was completed on Monday Nov 24.  The height of the modified block was measured at the four corners using a tape measure and found to be approximately 533mm at all corners.

The block was lowered to the E-Hall and aligned on Tuesday Nov 25.   No cantilever lift was required because the catwalk above the hatch had been removed.  During the block installation one of the crane cables was contacting the concrete on the edge of hatch opening.  Future installations should use a long sling or cable to prevent this.  Photos of the installation are attached.  Beamlines Group assisted with alignment using their laser tracker.  Vertical alignment was achieved using 3x3" metal shims of various thicknesses placed at 4 corners of the block.  North-south, east-west alignment was achieved by installing based on marks drawn on the E-Hall floor by Beamlines group.  After initial placement, measurements were taken with the laser tracker, and the position was adjusted.  The nominal positions of the beam dump according to installation drawing TSH0372 are:

East Face: x=-5926.3mm from EHBT CoP
South Face:  y=2223.6mm from EHBT CoP
Top Face: z=-208.0mm from EHBT CoP

The laser tracker measurements of block position after final placement are as follows:

East Face: x = -5926.2 ~ -5926.9mm
South Face: y = 2220.9 ~ 2224.7mm
Top Face: z = -209.6 ~ 211.6mm

The East face is within 0.6mm of nominal position which is excellent (note that the east-west direction cannot be corrected using the alignment rail track).  The south face position is within 2.7mm.  This is fine because adjustment can be made to the north-south position of the rail track.  The top face of the block is a maximum of 3.6mm below the nominal position which is also fine, as the lower lead shield block can be shimmed up to it's nominal position.  Data from Beamlines Group is attached (note that 19.05mm must be added to each measurement to account for the distance from target base to center).  The location of the measurement points on the top face are as follows.

                 North Side
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| 6                  4                  2 |
|                                           |
| 5                  3                  1 |
--------------------------------------------
 

We will aim to have the bottom of the lower lead shield at z = -204.8mm (this leaves nominal 2mm space to be shimmed under the rail track to bring the BD flange center to beam height).  Therefore the following thickness shims should be placed on the top of the lower center block.

Position 1: 5.8mm (suggest 1/8 + 1/16 + 1/32" shim = 5.6mm)
Position 2: 5.9mm (suggest 1/8 + 1/16 + 1/32" shim = 5.6mm)
Position 3: 6.8mm
Position 4: 6.0mm
Position 5: 5.1mm (suggest 1/8 + 1/16" shim = 4.8mm)
Position 6: 4.8mm (suggest 1/8 + 1/16" shim = 4.8mm)

Position 3 and 4 do not need shims, as the outer four corners should be adequate.