LCLS-II Undulator Hall Monument Network

Preliminary Design06-15-2011

UH Monument Network - Hypothesis

• UH tunnel:– Width of UH tunnel: 5.8m => spread of wall monuments: 5.6m

• FEL Layout:– Undulators are identical in the 2 FEL lines and placed in front

of each other (not staggered)– Separation between the 2 FEL lines is 2.5m– Undulators facing inward

• Undulator Design:– Top of the top jaw is at 2.1m (2.0 + 0.1 for open jaw)– Top motors are placed vertical

UH Monument Network - Design

• Wall monuments in middle of break sections at 2.3m above the floor

• Floor monuments in front of every other undulator

• For mapping, laser tracker position in the middle of the tunnel and in the middle of the break stations

Top View

Other facts to consider: Stay Clear area below the wall monuments for leveling purposes Cable trays higher than 2.7 m from the floor Position and size of electronic racks:

• behind undulators not behind the break sections • lower than the top of the top jaw

End View

Wall monument

Floor monument

0.7m stay clear below wall

monuments

0.7m stay clear below wall

monuments

stay clear for line of sight

Wall monument

Undulator Hall 50m Long Section Mapping Simulation

Input:• 12 floor and 22 wall monuments • 11 laser tracker set-ups => 158 triplet observations: 30 µm and 0.5 mgon• 75 height differences: 50 µm

Mid Section Result (in meters):F050 22.600000 -0.610000 0.020000 0.000013 0.000026 0.000019F060 27.000000 0.610000 0.020000 0.000013 0.000026 0.000019WN055 24.800000 2.800000 2.300000 0.000014 0.000029 0.000022WS055 24.800000 -2.800000 2.300000 0.000014 0.000029 0.000022

Line LegendPurple: Laser tracker observationGreen : Height difference

One Laser Tracker Set Up

Height range for laser tracker head: 2.1 – 2.4 meters

UH Monument Network - Alternatives

• Wider FEL line separation: 2.75m versus 2.5m– No significant changes (slightly better geometry)

• Longer undulators: 5m versus 3.4m– Assumptions• Same break section layout• Simple 1 direction scaling for the undulator (jaws and

frame) – Conclusions• Similar layout possible with fewer monuments => faster

process

Conclusion• Current proposed layout will produce similar a-priori statistics on

coordinates as in LCLS-I with the following requirements:– Undulators facing inward– Similar undulator size and location for the 2 FEL lines – Top motor vertical– No obstruction above break sections

• Required number of monuments about: – 3 times more than in LCLS-I– 2 times more for 5m long undulators

• Required mapping time (once undulators installed) : – 2 times more than in LCLS-I– 1.5 times more for 5m long undulators