|#||Error source||Relevant parameter||Introduced tilt per error||Accepted up to||Error Budget||Comments|
|1.||Mount positioning||Mount distance: ~ 2171mm||4.61xE-4 rad ~ 0.027 deg per mm||5.0mm||0.135 deg||Dominated by precision of mount points at LBT.|
|Beam alignment||Center distance beams: ~250mm||4.00xE-3 rad ~ 0.231 deg per mm||3.0mm||0.691 deg|| Dominated by planarity of beam flanges.
Originally better. With 0.05 planarity
1.74mm equal to 0.4 deg.
|3.||Torsion within T-Gusset||Length of Holder interface: ~170mm||5.88xE-4 rad ~ 0.339 deg per mm||0.5mm||0.170 deg|
0.02mm resolution 2mm max. rangewith a distance of about 124mm this results in:
33.46" resolution 0.465 deg max. rangeThis does only reflect what can be measured not what can be adjusted!!